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* Utility module to work with Arrays.\n *\n * @module array\n */\n\nimport * as set from './set.js'\n\n/**\n * Return the last element of an array. The element must exist\n *\n * @template L\n * @param {ArrayLike<L>} arr\n * @return {L}\n */\nexport const last = arr => arr[arr.length - 1]\n\n/**\n * @template C\n * @return {Array<C>}\n */\nexport const create = () => /** @type {Array<C>} */ ([])\n\n/**\n * @template D\n * @param {Array<D>} a\n * @return {Array<D>}\n */\nexport const copy = a => /** @type {Array<D>} */ (a.slice())\n\n/**\n * Append elements from src to dest\n *\n * @template M\n * @param {Array<M>} dest\n * @param {Array<M>} src\n */\nexport const appendTo = (dest, src) => {\n  for (let i = 0; i < src.length; i++) {\n    dest.push(src[i])\n  }\n}\n\n/**\n * Transforms something array-like to an actual Array.\n *\n * @function\n * @template T\n * @param {ArrayLike<T>|Iterable<T>} arraylike\n * @return {T}\n */\nexport const from = Array.from\n\n/**\n * True iff condition holds on every element in the Array.\n *\n * @function\n * @template ITEM\n * @template {ArrayLike<ITEM>} ARR\n *\n * @param {ARR} arr\n * @param {function(ITEM, number, ARR):boolean} f\n * @return {boolean}\n */\nexport const every = (arr, f) => {\n  for (let i = 0; i < arr.length; i++) {\n    if (!f(arr[i], i, arr)) {\n      return false\n    }\n  }\n  return true\n}\n\n/**\n * True iff condition holds on some element in the Array.\n *\n * @function\n * @template S\n * @template {ArrayLike<S>} ARR\n * @param {ARR} arr\n * @param {function(S, number, ARR):boolean} f\n * @return {boolean}\n */\nexport const some = (arr, f) => {\n  for (let i = 0; i < arr.length; i++) {\n    if (f(arr[i], i, arr)) {\n      return true\n    }\n  }\n  return false\n}\n\n/**\n * @template ELEM\n *\n * @param {ArrayLike<ELEM>} a\n * @param {ArrayLike<ELEM>} b\n * @return {boolean}\n */\nexport const equalFlat = (a, b) => a.length === b.length && every(a, (item, index) => item === b[index])\n\n/**\n * @template ELEM\n * @param {Array<Array<ELEM>>} arr\n * @return {Array<ELEM>}\n */\nexport const flatten = arr => fold(arr, /** @type {Array<ELEM>} */ ([]), (acc, val) => acc.concat(val))\n\n/**\n * @template T\n * @param {number} len\n * @param {function(number, Array<T>):T} f\n * @return {Array<T>}\n */\nexport const unfold = (len, f) => {\n  const array = new Array(len)\n  for (let i = 0; i < len; i++) {\n    array[i] = f(i, array)\n  }\n  return array\n}\n\n/**\n * @template T\n * @template RESULT\n * @param {Array<T>} arr\n * @param {RESULT} seed\n * @param {function(RESULT, T, number):RESULT} folder\n */\nexport const fold = (arr, seed, folder) => arr.reduce(folder, seed)\n\nexport const isArray = Array.isArray\n\n/**\n * @template T\n * @param {Array<T>} arr\n * @return {Array<T>}\n */\nexport const unique = arr => from(set.from(arr))\n\n/**\n * @template T\n * @template M\n * @param {ArrayLike<T>} arr\n * @param {function(T):M} mapper\n * @return {Array<T>}\n */\nexport const uniqueBy = (arr, mapper) => {\n  /**\n   * @type {Set<M>}\n   */\n  const happened = set.create()\n  /**\n   * @type {Array<T>}\n   */\n  const result = []\n  for (let i = 0; i < arr.length; i++) {\n    const el = arr[i]\n    const mapped = mapper(el)\n    if (!happened.has(mapped)) {\n      happened.add(mapped)\n      result.push(el)\n    }\n  }\n  return result\n}\n\n/**\n * @template {ArrayLike<any>} ARR\n * @template {function(ARR extends ArrayLike<infer T> ? T : never, number, ARR):any} MAPPER\n * @param {ARR} arr\n * @param {MAPPER} mapper\n * @return {Array<MAPPER extends function(...any): infer M ? M : never>}\n */\nexport const map = (arr, mapper) => {\n  /**\n   * @type {Array<any>}\n   */\n  const res = Array(arr.length)\n  for (let i = 0; i < arr.length; i++) {\n    res[i] = mapper(/** @type {any} */ (arr[i]), i, /** @type {any} */ (arr))\n  }\n  return /** @type {any} */ (res)\n}\n","/* eslint-env browser */\n\n/**\n * Binary data constants.\n *\n * @module binary\n */\n\n/**\n * n-th bit activated.\n *\n * @type {number}\n */\nexport const BIT1 = 1\nexport const BIT2 = 2\nexport const BIT3 = 4\nexport const BIT4 = 8\nexport const BIT5 = 16\nexport const BIT6 = 32\nexport const BIT7 = 64\nexport const BIT8 = 128\nexport const BIT9 = 256\nexport const BIT10 = 512\nexport const BIT11 = 1024\nexport const BIT12 = 2048\nexport const BIT13 = 4096\nexport const BIT14 = 8192\nexport const BIT15 = 16384\nexport const BIT16 = 32768\nexport const BIT17 = 65536\nexport const BIT18 = 1 << 17\nexport const BIT19 = 1 << 18\nexport const BIT20 = 1 << 19\nexport const BIT21 = 1 << 20\nexport const BIT22 = 1 << 21\nexport const BIT23 = 1 << 22\nexport const BIT24 = 1 << 23\nexport const BIT25 = 1 << 24\nexport const BIT26 = 1 << 25\nexport const BIT27 = 1 << 26\nexport const BIT28 = 1 << 27\nexport const BIT29 = 1 << 28\nexport const BIT30 = 1 << 29\nexport const BIT31 = 1 << 30\nexport const BIT32 = 1 << 31\n\n/**\n * First n bits activated.\n *\n * @type {number}\n */\nexport const BITS0 = 0\nexport const BITS1 = 1\nexport const BITS2 = 3\nexport const BITS3 = 7\nexport const BITS4 = 15\nexport const BITS5 = 31\nexport const BITS6 = 63\nexport const BITS7 = 127\nexport const BITS8 = 255\nexport const BITS9 = 511\nexport const BITS10 = 1023\nexport const BITS11 = 2047\nexport const BITS12 = 4095\nexport const BITS13 = 8191\nexport const BITS14 = 16383\nexport const BITS15 = 32767\nexport const BITS16 = 65535\nexport const BITS17 = BIT18 - 1\nexport const BITS18 = BIT19 - 1\nexport const BITS19 = BIT20 - 1\nexport const BITS20 = BIT21 - 1\nexport const BITS21 = BIT22 - 1\nexport const BITS22 = BIT23 - 1\nexport const BITS23 = BIT24 - 1\nexport const BITS24 = BIT25 - 1\nexport const BITS25 = BIT26 - 1\nexport const BITS26 = BIT27 - 1\nexport const BITS27 = BIT28 - 1\nexport const BITS28 = BIT29 - 1\nexport const BITS29 = BIT30 - 1\nexport const BITS30 = BIT31 - 1\n/**\n * @type {number}\n */\nexport const BITS31 = 0x7FFFFFFF\n/**\n * @type {number}\n */\nexport const BITS32 = 0xFFFFFFFF\n","/**\n * Utility functions to work with buffers (Uint8Array).\n *\n * @module buffer\n */\n\nimport * as string from './string.js'\nimport * as env from './environment.js'\nimport * as array from './array.js'\nimport * as math from './math.js'\nimport * as encoding from './encoding.js'\nimport * as decoding from './decoding.js'\n\n/**\n * @param {number} len\n */\nexport const createUint8ArrayFromLen = len => new Uint8Array(len)\n\n/**\n * Create Uint8Array with initial content from buffer\n *\n * @param {ArrayBuffer} buffer\n * @param {number} byteOffset\n * @param {number} length\n */\nexport const createUint8ArrayViewFromArrayBuffer = (buffer, byteOffset, length) => new Uint8Array(buffer, byteOffset, length)\n\n/**\n * Create Uint8Array with initial content from buffer\n *\n * @param {ArrayBuffer} buffer\n */\nexport const createUint8ArrayFromArrayBuffer = buffer => new Uint8Array(buffer)\n\n/* c8 ignore start */\n/**\n * @param {Uint8Array} bytes\n * @return {string}\n */\nconst toBase64Browser = bytes => {\n  let s = ''\n  for (let i = 0; i < bytes.byteLength; i++) {\n    s += string.fromCharCode(bytes[i])\n  }\n  // eslint-disable-next-line no-undef\n  return btoa(s)\n}\n/* c8 ignore stop */\n\n/**\n * @param {Uint8Array} bytes\n * @return {string}\n */\nconst toBase64Node = bytes => Buffer.from(bytes.buffer, bytes.byteOffset, bytes.byteLength).toString('base64')\n\n/* c8 ignore start */\n/**\n * @param {string} s\n * @return {Uint8Array}\n */\nconst fromBase64Browser = s => {\n  // eslint-disable-next-line no-undef\n  const a = atob(s)\n  const bytes = createUint8ArrayFromLen(a.length)\n  for (let i = 0; i < a.length; i++) {\n    bytes[i] = a.charCodeAt(i)\n  }\n  return bytes\n}\n/* c8 ignore stop */\n\n/**\n * @param {string} s\n */\nconst fromBase64Node = s => {\n  const buf = Buffer.from(s, 'base64')\n  return createUint8ArrayViewFromArrayBuffer(buf.buffer, buf.byteOffset, buf.byteLength)\n}\n\n/* c8 ignore next */\nexport const toBase64 = env.isBrowser ? toBase64Browser : toBase64Node\n\n/* c8 ignore next */\nexport const fromBase64 = env.isBrowser ? fromBase64Browser : fromBase64Node\n\n/**\n * Implements base64url - see https://datatracker.ietf.org/doc/html/rfc4648#section-5\n * @param {Uint8Array} buf\n */\nexport const toBase64UrlEncoded = buf => toBase64(buf).replaceAll('+', '-').replaceAll('/', '_').replaceAll('=', '')\n\n/**\n * @param {string} base64\n */\nexport const fromBase64UrlEncoded = base64 => fromBase64(base64.replaceAll('-', '+').replaceAll('_', '/'))\n\n/**\n * Base64 is always a more efficient choice. This exists for utility purposes only.\n *\n * @param {Uint8Array} buf\n */\nexport const toHexString = buf => array.map(buf, b => b.toString(16).padStart(2, '0')).join('')\n\n/**\n * Note: This function expects that the hex doesn't start with 0x..\n *\n * @param {string} hex\n */\nexport const fromHexString = hex => {\n  const hlen = hex.length\n  const buf = new Uint8Array(math.ceil(hlen / 2))\n  for (let i = 0; i < hlen; i += 2) {\n    buf[buf.length - i / 2 - 1] = Number.parseInt(hex.slice(hlen - i - 2, hlen - i), 16)\n  }\n  return buf\n}\n\n/**\n * Copy the content of an Uint8Array view to a new ArrayBuffer.\n *\n * @param {Uint8Array} uint8Array\n * @return {Uint8Array}\n */\nexport const copyUint8Array = uint8Array => {\n  const newBuf = createUint8ArrayFromLen(uint8Array.byteLength)\n  newBuf.set(uint8Array)\n  return newBuf\n}\n\n/**\n * Encode anything as a UInt8Array. It's a pun on typescripts's `any` type.\n * See encoding.writeAny for more information.\n *\n * @param {any} data\n * @return {Uint8Array}\n */\nexport const encodeAny = data =>\n  encoding.encode(encoder => encoding.writeAny(encoder, data))\n\n/**\n * Decode an any-encoded value.\n *\n * @param {Uint8Array} buf\n * @return {any}\n */\nexport const decodeAny = buf => decoding.readAny(decoding.createDecoder(buf))\n\n/**\n * Shift Byte Array {N} bits to the left. Does not expand byte array.\n *\n * @param {Uint8Array} bs\n * @param {number} N should be in the range of [0-7]\n */\nexport const shiftNBitsLeft = (bs, N) => {\n  if (N === 0) return bs\n  bs = new Uint8Array(bs)\n  bs[0] <<= N\n  for (let i = 1; i < bs.length; i++) {\n    bs[i - 1] |= bs[i] >>> (8 - N)\n    bs[i] <<= N\n  }\n  return bs\n}\n","/**\n * Efficient schema-less binary decoding with support for variable length encoding.\n *\n * Use [lib0/decoding] with [lib0/encoding]. Every encoding function has a corresponding decoding function.\n *\n * Encodes numbers in little-endian order (least to most significant byte order)\n * and is compatible with Golang's binary encoding (https://golang.org/pkg/encoding/binary/)\n * which is also used in Protocol Buffers.\n *\n * ```js\n * // encoding step\n * const encoder = encoding.createEncoder()\n * encoding.writeVarUint(encoder, 256)\n * encoding.writeVarString(encoder, 'Hello world!')\n * const buf = encoding.toUint8Array(encoder)\n * ```\n *\n * ```js\n * // decoding step\n * const decoder = decoding.createDecoder(buf)\n * decoding.readVarUint(decoder) // => 256\n * decoding.readVarString(decoder) // => 'Hello world!'\n * decoding.hasContent(decoder) // => false - all data is read\n * ```\n *\n * @module decoding\n */\n\nimport * as binary from './binary.js'\nimport * as math from './math.js'\nimport * as number from './number.js'\nimport * as string from './string.js'\nimport * as error from './error.js'\nimport * as encoding from './encoding.js'\n\nconst errorUnexpectedEndOfArray = error.create('Unexpected end of array')\nconst errorIntegerOutOfRange = error.create('Integer out of Range')\n\n/**\n * A Decoder handles the decoding of an Uint8Array.\n */\nexport class Decoder {\n  /**\n   * @param {Uint8Array} uint8Array Binary data to decode\n   */\n  constructor (uint8Array) {\n    /**\n     * Decoding target.\n     *\n     * @type {Uint8Array}\n     */\n    this.arr = uint8Array\n    /**\n     * Current decoding position.\n     *\n     * @type {number}\n     */\n    this.pos = 0\n  }\n}\n\n/**\n * @function\n * @param {Uint8Array} uint8Array\n * @return {Decoder}\n */\nexport const createDecoder = uint8Array => new Decoder(uint8Array)\n\n/**\n * @function\n * @param {Decoder} decoder\n * @return {boolean}\n */\nexport const hasContent = decoder => decoder.pos !== decoder.arr.length\n\n/**\n * Clone a decoder instance.\n * Optionally set a new position parameter.\n *\n * @function\n * @param {Decoder} decoder The decoder instance\n * @param {number} [newPos] Defaults to current position\n * @return {Decoder} A clone of `decoder`\n */\nexport const clone = (decoder, newPos = decoder.pos) => {\n  const _decoder = createDecoder(decoder.arr)\n  _decoder.pos = newPos\n  return _decoder\n}\n\n/**\n * Create an Uint8Array view of the next `len` bytes and advance the position by `len`.\n *\n * Important: The Uint8Array still points to the underlying ArrayBuffer. Make sure to discard the result as soon as possible to prevent any memory leaks.\n *            Use `buffer.copyUint8Array` to copy the result into a new Uint8Array.\n *\n * @function\n * @param {Decoder} decoder The decoder instance\n * @param {number} len The length of bytes to read\n * @return {Uint8Array}\n */\nexport const readUint8Array = (decoder, len) => {\n  const view = new Uint8Array(decoder.arr.buffer, decoder.pos + decoder.arr.byteOffset, len)\n  decoder.pos += len\n  return view\n}\n\n/**\n * Read variable length Uint8Array.\n *\n * Important: The Uint8Array still points to the underlying ArrayBuffer. Make sure to discard the result as soon as possible to prevent any memory leaks.\n *            Use `buffer.copyUint8Array` to copy the result into a new Uint8Array.\n *\n * @function\n * @param {Decoder} decoder\n * @return {Uint8Array}\n */\nexport const readVarUint8Array = decoder => readUint8Array(decoder, readVarUint(decoder))\n\n/**\n * Read the rest of the content as an ArrayBuffer\n * @function\n * @param {Decoder} decoder\n * @return {Uint8Array}\n */\nexport const readTailAsUint8Array = decoder => readUint8Array(decoder, decoder.arr.length - decoder.pos)\n\n/**\n * Skip one byte, jump to the next position.\n * @function\n * @param {Decoder} decoder The decoder instance\n * @return {number} The next position\n */\nexport const skip8 = decoder => decoder.pos++\n\n/**\n * Read one byte as unsigned integer.\n * @function\n * @param {Decoder} decoder The decoder instance\n * @return {number} Unsigned 8-bit integer\n */\nexport const readUint8 = decoder => decoder.arr[decoder.pos++]\n\n/**\n * Read 2 bytes as unsigned integer.\n *\n * @function\n * @param {Decoder} decoder\n * @return {number} An unsigned integer.\n */\nexport const readUint16 = decoder => {\n  const uint =\n    decoder.arr[decoder.pos] +\n    (decoder.arr[decoder.pos + 1] << 8)\n  decoder.pos += 2\n  return uint\n}\n\n/**\n * Read 4 bytes as unsigned integer.\n *\n * @function\n * @param {Decoder} decoder\n * @return {number} An unsigned integer.\n */\nexport const readUint32 = decoder => {\n  const uint =\n    (decoder.arr[decoder.pos] +\n    (decoder.arr[decoder.pos + 1] << 8) +\n    (decoder.arr[decoder.pos + 2] << 16) +\n    (decoder.arr[decoder.pos + 3] << 24)) >>> 0\n  decoder.pos += 4\n  return uint\n}\n\n/**\n * Read 4 bytes as unsigned integer in big endian order.\n * (most significant byte first)\n *\n * @function\n * @param {Decoder} decoder\n * @return {number} An unsigned integer.\n */\nexport const readUint32BigEndian = decoder => {\n  const uint =\n    (decoder.arr[decoder.pos + 3] +\n    (decoder.arr[decoder.pos + 2] << 8) +\n    (decoder.arr[decoder.pos + 1] << 16) +\n    (decoder.arr[decoder.pos] << 24)) >>> 0\n  decoder.pos += 4\n  return uint\n}\n\n/**\n * Look ahead without incrementing the position\n * to the next byte and read it as unsigned integer.\n *\n * @function\n * @param {Decoder} decoder\n * @return {number} An unsigned integer.\n */\nexport const peekUint8 = decoder => decoder.arr[decoder.pos]\n\n/**\n * Look ahead without incrementing the position\n * to the next byte and read it as unsigned integer.\n *\n * @function\n * @param {Decoder} decoder\n * @return {number} An unsigned integer.\n */\nexport const peekUint16 = decoder =>\n  decoder.arr[decoder.pos] +\n  (decoder.arr[decoder.pos + 1] << 8)\n\n/**\n * Look ahead without incrementing the position\n * to the next byte and read it as unsigned integer.\n *\n * @function\n * @param {Decoder} decoder\n * @return {number} An unsigned integer.\n */\nexport const peekUint32 = decoder => (\n  decoder.arr[decoder.pos] +\n  (decoder.arr[decoder.pos + 1] << 8) +\n  (decoder.arr[decoder.pos + 2] << 16) +\n  (decoder.arr[decoder.pos + 3] << 24)\n) >>> 0\n\n/**\n * Read unsigned integer (32bit) with variable length.\n * 1/8th of the storage is used as encoding overhead.\n *  * numbers < 2^7 is stored in one bytlength\n *  * numbers < 2^14 is stored in two bylength\n *\n * @function\n * @param {Decoder} decoder\n * @return {number} An unsigned integer.length\n */\nexport const readVarUint = decoder => {\n  let num = 0\n  let mult = 1\n  const len = decoder.arr.length\n  while (decoder.pos < len) {\n    const r = decoder.arr[decoder.pos++]\n    // num = num | ((r & binary.BITS7) << len)\n    num = num + (r & binary.BITS7) * mult // shift $r << (7*#iterations) and add it to num\n    mult *= 128 // next iteration, shift 7 \"more\" to the left\n    if (r < binary.BIT8) {\n      return num\n    }\n    /* c8 ignore start */\n    if (num > number.MAX_SAFE_INTEGER) {\n      throw errorIntegerOutOfRange\n    }\n    /* c8 ignore stop */\n  }\n  throw errorUnexpectedEndOfArray\n}\n\n/**\n * Read signed integer (32bit) with variable length.\n * 1/8th of the storage is used as encoding overhead.\n *  * numbers < 2^7 is stored in one bytlength\n *  * numbers < 2^14 is stored in two bylength\n * @todo This should probably create the inverse ~num if number is negative - but this would be a breaking change.\n *\n * @function\n * @param {Decoder} decoder\n * @return {number} An unsigned integer.length\n */\nexport const readVarInt = decoder => {\n  let r = decoder.arr[decoder.pos++]\n  let num = r & binary.BITS6\n  let mult = 64\n  const sign = (r & binary.BIT7) > 0 ? -1 : 1\n  if ((r & binary.BIT8) === 0) {\n    // don't continue reading\n    return sign * num\n  }\n  const len = decoder.arr.length\n  while (decoder.pos < len) {\n    r = decoder.arr[decoder.pos++]\n    // num = num | ((r & binary.BITS7) << len)\n    num = num + (r & binary.BITS7) * mult\n    mult *= 128\n    if (r < binary.BIT8) {\n      return sign * num\n    }\n    /* c8 ignore start */\n    if (num > number.MAX_SAFE_INTEGER) {\n      throw errorIntegerOutOfRange\n    }\n    /* c8 ignore stop */\n  }\n  throw errorUnexpectedEndOfArray\n}\n\n/**\n * Look ahead and read varUint without incrementing position\n *\n * @function\n * @param {Decoder} decoder\n * @return {number}\n */\nexport const peekVarUint = decoder => {\n  const pos = decoder.pos\n  const s = readVarUint(decoder)\n  decoder.pos = pos\n  return s\n}\n\n/**\n * Look ahead and read varUint without incrementing position\n *\n * @function\n * @param {Decoder} decoder\n * @return {number}\n */\nexport const peekVarInt = decoder => {\n  const pos = decoder.pos\n  const s = readVarInt(decoder)\n  decoder.pos = pos\n  return s\n}\n\n/**\n * We don't test this function anymore as we use native decoding/encoding by default now.\n * Better not modify this anymore..\n *\n * Transforming utf8 to a string is pretty expensive. The code performs 10x better\n * when String.fromCodePoint is fed with all characters as arguments.\n * But most environments have a maximum number of arguments per functions.\n * For effiency reasons we apply a maximum of 10000 characters at once.\n *\n * @function\n * @param {Decoder} decoder\n * @return {String} The read String.\n */\n/* c8 ignore start */\nexport const _readVarStringPolyfill = decoder => {\n  let remainingLen = readVarUint(decoder)\n  if (remainingLen === 0) {\n    return ''\n  } else {\n    let encodedString = String.fromCodePoint(readUint8(decoder)) // remember to decrease remainingLen\n    if (--remainingLen < 100) { // do not create a Uint8Array for small strings\n      while (remainingLen--) {\n        encodedString += String.fromCodePoint(readUint8(decoder))\n      }\n    } else {\n      while (remainingLen > 0) {\n        const nextLen = remainingLen < 10000 ? remainingLen : 10000\n        // this is dangerous, we create a fresh array view from the existing buffer\n        const bytes = decoder.arr.subarray(decoder.pos, decoder.pos + nextLen)\n        decoder.pos += nextLen\n        // Starting with ES5.1 we can supply a generic array-like object as arguments\n        encodedString += String.fromCodePoint.apply(null, /** @type {any} */ (bytes))\n        remainingLen -= nextLen\n      }\n    }\n    return decodeURIComponent(escape(encodedString))\n  }\n}\n/* c8 ignore stop */\n\n/**\n * @function\n * @param {Decoder} decoder\n * @return {String} The read String\n */\nexport const _readVarStringNative = decoder =>\n  /** @type any */ (string.utf8TextDecoder).decode(readVarUint8Array(decoder))\n\n/**\n * Read string of variable length\n * * varUint is used to store the length of the string\n *\n * @function\n * @param {Decoder} decoder\n * @return {String} The read String\n *\n */\n/* c8 ignore next */\nexport const readVarString = string.utf8TextDecoder ? _readVarStringNative : _readVarStringPolyfill\n\n/**\n * @param {Decoder} decoder\n * @return {Uint8Array}\n */\nexport const readTerminatedUint8Array = decoder => {\n  const encoder = encoding.createEncoder()\n  let b\n  while (true) {\n    b = readUint8(decoder)\n    if (b === 0) {\n      return encoding.toUint8Array(encoder)\n    }\n    if (b === 1) {\n      b = readUint8(decoder)\n    }\n    encoding.write(encoder, b)\n  }\n}\n\n/**\n * @param {Decoder} decoder\n * @return {string}\n */\nexport const readTerminatedString = decoder => string.decodeUtf8(readTerminatedUint8Array(decoder))\n\n/**\n * Look ahead and read varString without incrementing position\n *\n * @function\n * @param {Decoder} decoder\n * @return {string}\n */\nexport const peekVarString = decoder => {\n  const pos = decoder.pos\n  const s = readVarString(decoder)\n  decoder.pos = pos\n  return s\n}\n\n/**\n * @param {Decoder} decoder\n * @param {number} len\n * @return {DataView}\n */\nexport const readFromDataView = (decoder, len) => {\n  const dv = new DataView(decoder.arr.buffer, decoder.arr.byteOffset + decoder.pos, len)\n  decoder.pos += len\n  return dv\n}\n\n/**\n * @param {Decoder} decoder\n */\nexport const readFloat32 = decoder => readFromDataView(decoder, 4).getFloat32(0, false)\n\n/**\n * @param {Decoder} decoder\n */\nexport const readFloat64 = decoder => readFromDataView(decoder, 8).getFloat64(0, false)\n\n/**\n * @param {Decoder} decoder\n */\nexport const readBigInt64 = decoder => /** @type {any} */ (readFromDataView(decoder, 8)).getBigInt64(0, false)\n\n/**\n * @param {Decoder} decoder\n */\nexport const readBigUint64 = decoder => /** @type {any} */ (readFromDataView(decoder, 8)).getBigUint64(0, false)\n\n/**\n * @type {Array<function(Decoder):any>}\n */\nconst readAnyLookupTable = [\n  decoder => undefined, // CASE 127: undefined\n  decoder => null, // CASE 126: null\n  readVarInt, // CASE 125: integer\n  readFloat32, // CASE 124: float32\n  readFloat64, // CASE 123: float64\n  readBigInt64, // CASE 122: bigint\n  decoder => false, // CASE 121: boolean (false)\n  decoder => true, // CASE 120: boolean (true)\n  readVarString, // CASE 119: string\n  decoder => { // CASE 118: object<string,any>\n    const len = readVarUint(decoder)\n    /**\n     * @type {Object<string,any>}\n     */\n    const obj = {}\n    for (let i = 0; i < len; i++) {\n      const key = readVarString(decoder)\n      obj[key] = readAny(decoder)\n    }\n    return obj\n  },\n  decoder => { // CASE 117: array<any>\n    const len = readVarUint(decoder)\n    const arr = []\n    for (let i = 0; i < len; i++) {\n      arr.push(readAny(decoder))\n    }\n    return arr\n  },\n  readVarUint8Array // CASE 116: Uint8Array\n]\n\n/**\n * @param {Decoder} decoder\n */\nexport const readAny = decoder => readAnyLookupTable[127 - readUint8(decoder)](decoder)\n\n/**\n * T must not be null.\n *\n * @template T\n */\nexport class RleDecoder extends Decoder {\n  /**\n   * @param {Uint8Array} uint8Array\n   * @param {function(Decoder):T} reader\n   */\n  constructor (uint8Array, reader) {\n    super(uint8Array)\n    /**\n     * The reader\n     */\n    this.reader = reader\n    /**\n     * Current state\n     * @type {T|null}\n     */\n    this.s = null\n    this.count = 0\n  }\n\n  read () {\n    if (this.count === 0) {\n      this.s = this.reader(this)\n      if (hasContent(this)) {\n        this.count = readVarUint(this) + 1 // see encoder implementation for the reason why this is incremented\n      } else {\n        this.count = -1 // read the current value forever\n      }\n    }\n    this.count--\n    return /** @type {T} */ (this.s)\n  }\n}\n\nexport class IntDiffDecoder extends Decoder {\n  /**\n   * @param {Uint8Array} uint8Array\n   * @param {number} start\n   */\n  constructor (uint8Array, start) {\n    super(uint8Array)\n    /**\n     * Current state\n     * @type {number}\n     */\n    this.s = start\n  }\n\n  /**\n   * @return {number}\n   */\n  read () {\n    this.s += readVarInt(this)\n    return this.s\n  }\n}\n\nexport class RleIntDiffDecoder extends Decoder {\n  /**\n   * @param {Uint8Array} uint8Array\n   * @param {number} start\n   */\n  constructor (uint8Array, start) {\n    super(uint8Array)\n    /**\n     * Current state\n     * @type {number}\n     */\n    this.s = start\n    this.count = 0\n  }\n\n  /**\n   * @return {number}\n   */\n  read () {\n    if (this.count === 0) {\n      this.s += readVarInt(this)\n      if (hasContent(this)) {\n        this.count = readVarUint(this) + 1 // see encoder implementation for the reason why this is incremented\n      } else {\n        this.count = -1 // read the current value forever\n      }\n    }\n    this.count--\n    return /** @type {number} */ (this.s)\n  }\n}\n\nexport class UintOptRleDecoder extends Decoder {\n  /**\n   * @param {Uint8Array} uint8Array\n   */\n  constructor (uint8Array) {\n    super(uint8Array)\n    /**\n     * @type {number}\n     */\n    this.s = 0\n    this.count = 0\n  }\n\n  read () {\n    if (this.count === 0) {\n      this.s = readVarInt(this)\n      // if the sign is negative, we read the count too, otherwise count is 1\n      const isNegative = math.isNegativeZero(this.s)\n      this.count = 1\n      if (isNegative) {\n        this.s = -this.s\n        this.count = readVarUint(this) + 2\n      }\n    }\n    this.count--\n    return /** @type {number} */ (this.s)\n  }\n}\n\nexport class IncUintOptRleDecoder extends Decoder {\n  /**\n   * @param {Uint8Array} uint8Array\n   */\n  constructor (uint8Array) {\n    super(uint8Array)\n    /**\n     * @type {number}\n     */\n    this.s = 0\n    this.count = 0\n  }\n\n  read () {\n    if (this.count === 0) {\n      this.s = readVarInt(this)\n      // if the sign is negative, we read the count too, otherwise count is 1\n      const isNegative = math.isNegativeZero(this.s)\n      this.count = 1\n      if (isNegative) {\n        this.s = -this.s\n        this.count = readVarUint(this) + 2\n      }\n    }\n    this.count--\n    return /** @type {number} */ (this.s++)\n  }\n}\n\nexport class IntDiffOptRleDecoder extends Decoder {\n  /**\n   * @param {Uint8Array} uint8Array\n   */\n  constructor (uint8Array) {\n    super(uint8Array)\n    /**\n     * @type {number}\n     */\n    this.s = 0\n    this.count = 0\n    this.diff = 0\n  }\n\n  /**\n   * @return {number}\n   */\n  read () {\n    if (this.count === 0) {\n      const diff = readVarInt(this)\n      // if the first bit is set, we read more data\n      const hasCount = diff & 1\n      this.diff = math.floor(diff / 2) // shift >> 1\n      this.count = 1\n      if (hasCount) {\n        this.count = readVarUint(this) + 2\n      }\n    }\n    this.s += this.diff\n    this.count--\n    return this.s\n  }\n}\n\nexport class StringDecoder {\n  /**\n   * @param {Uint8Array} uint8Array\n   */\n  constructor (uint8Array) {\n    this.decoder = new UintOptRleDecoder(uint8Array)\n    this.str = readVarString(this.decoder)\n    /**\n     * @type {number}\n     */\n    this.spos = 0\n  }\n\n  /**\n   * @return {string}\n   */\n  read () {\n    const end = this.spos + this.decoder.read()\n    const res = this.str.slice(this.spos, end)\n    this.spos = end\n    return res\n  }\n}\n","/**\n * Efficient schema-less binary encoding with support for variable length encoding.\n *\n * Use [lib0/encoding] with [lib0/decoding]. Every encoding function has a corresponding decoding function.\n *\n * Encodes numbers in little-endian order (least to most significant byte order)\n * and is compatible with Golang's binary encoding (https://golang.org/pkg/encoding/binary/)\n * which is also used in Protocol Buffers.\n *\n * ```js\n * // encoding step\n * const encoder = encoding.createEncoder()\n * encoding.writeVarUint(encoder, 256)\n * encoding.writeVarString(encoder, 'Hello world!')\n * const buf = encoding.toUint8Array(encoder)\n * ```\n *\n * ```js\n * // decoding step\n * const decoder = decoding.createDecoder(buf)\n * decoding.readVarUint(decoder) // => 256\n * decoding.readVarString(decoder) // => 'Hello world!'\n * decoding.hasContent(decoder) // => false - all data is read\n * ```\n *\n * @module encoding\n */\n\nimport * as math from './math.js'\nimport * as number from './number.js'\nimport * as binary from './binary.js'\nimport * as string from './string.js'\nimport * as array from './array.js'\n\n/**\n * A BinaryEncoder handles the encoding to an Uint8Array.\n */\nexport class Encoder {\n  constructor () {\n    this.cpos = 0\n    this.cbuf = new Uint8Array(100)\n    /**\n     * @type {Array<Uint8Array>}\n     */\n    this.bufs = []\n  }\n}\n\n/**\n * @function\n * @return {Encoder}\n */\nexport const createEncoder = () => new Encoder()\n\n/**\n * @param {function(Encoder):void} f\n */\nexport const encode = (f) => {\n  const encoder = createEncoder()\n  f(encoder)\n  return toUint8Array(encoder)\n}\n\n/**\n * The current length of the encoded data.\n *\n * @function\n * @param {Encoder} encoder\n * @return {number}\n */\nexport const length = encoder => {\n  let len = encoder.cpos\n  for (let i = 0; i < encoder.bufs.length; i++) {\n    len += encoder.bufs[i].length\n  }\n  return len\n}\n\n/**\n * Check whether encoder is empty.\n *\n * @function\n * @param {Encoder} encoder\n * @return {boolean}\n */\nexport const hasContent = encoder => encoder.cpos > 0 || encoder.bufs.length > 0\n\n/**\n * Transform to Uint8Array.\n *\n * @function\n * @param {Encoder} encoder\n * @return {Uint8Array} The created ArrayBuffer.\n */\nexport const toUint8Array = encoder => {\n  const uint8arr = new Uint8Array(length(encoder))\n  let curPos = 0\n  for (let i = 0; i < encoder.bufs.length; i++) {\n    const d = encoder.bufs[i]\n    uint8arr.set(d, curPos)\n    curPos += d.length\n  }\n  uint8arr.set(new Uint8Array(encoder.cbuf.buffer, 0, encoder.cpos), curPos)\n  return uint8arr\n}\n\n/**\n * Verify that it is possible to write `len` bytes wtihout checking. If\n * necessary, a new Buffer with the required length is attached.\n *\n * @param {Encoder} encoder\n * @param {number} len\n */\nexport const verifyLen = (encoder, len) => {\n  const bufferLen = encoder.cbuf.length\n  if (bufferLen - encoder.cpos < len) {\n    encoder.bufs.push(new Uint8Array(encoder.cbuf.buffer, 0, encoder.cpos))\n    encoder.cbuf = new Uint8Array(math.max(bufferLen, len) * 2)\n    encoder.cpos = 0\n  }\n}\n\n/**\n * Write one byte to the encoder.\n *\n * @function\n * @param {Encoder} encoder\n * @param {number} num The byte that is to be encoded.\n */\nexport const write = (encoder, num) => {\n  const bufferLen = encoder.cbuf.length\n  if (encoder.cpos === bufferLen) {\n    encoder.bufs.push(encoder.cbuf)\n    encoder.cbuf = new Uint8Array(bufferLen * 2)\n    encoder.cpos = 0\n  }\n  encoder.cbuf[encoder.cpos++] = num\n}\n\n/**\n * Write one byte at a specific position.\n * Position must already be written (i.e. encoder.length > pos)\n *\n * @function\n * @param {Encoder} encoder\n * @param {number} pos Position to which to write data\n * @param {number} num Unsigned 8-bit integer\n */\nexport const set = (encoder, pos, num) => {\n  let buffer = null\n  // iterate all buffers and adjust position\n  for (let i = 0; i < encoder.bufs.length && buffer === null; i++) {\n    const b = encoder.bufs[i]\n    if (pos < b.length) {\n      buffer = b // found buffer\n    } else {\n      pos -= b.length\n    }\n  }\n  if (buffer === null) {\n    // use current buffer\n    buffer = encoder.cbuf\n  }\n  buffer[pos] = num\n}\n\n/**\n * Write one byte as an unsigned integer.\n *\n * @function\n * @param {Encoder} encoder\n * @param {number} num The number that is to be encoded.\n */\nexport const writeUint8 = write\n\n/**\n * Write one byte as an unsigned Integer at a specific location.\n *\n * @function\n * @param {Encoder} encoder\n * @param {number} pos The location where the data will be written.\n * @param {number} num The number that is to be encoded.\n */\nexport const setUint8 = set\n\n/**\n * Write two bytes as an unsigned integer.\n *\n * @function\n * @param {Encoder} encoder\n * @param {number} num The number that is to be encoded.\n */\nexport const writeUint16 = (encoder, num) => {\n  write(encoder, num & binary.BITS8)\n  write(encoder, (num >>> 8) & binary.BITS8)\n}\n/**\n * Write two bytes as an unsigned integer at a specific location.\n *\n * @function\n * @param {Encoder} encoder\n * @param {number} pos The location where the data will be written.\n * @param {number} num The number that is to be encoded.\n */\nexport const setUint16 = (encoder, pos, num) => {\n  set(encoder, pos, num & binary.BITS8)\n  set(encoder, pos + 1, (num >>> 8) & binary.BITS8)\n}\n\n/**\n * Write two bytes as an unsigned integer\n *\n * @function\n * @param {Encoder} encoder\n * @param {number} num The number that is to be encoded.\n */\nexport const writeUint32 = (encoder, num) => {\n  for (let i = 0; i < 4; i++) {\n    write(encoder, num & binary.BITS8)\n    num >>>= 8\n  }\n}\n\n/**\n * Write two bytes as an unsigned integer in big endian order.\n * (most significant byte first)\n *\n * @function\n * @param {Encoder} encoder\n * @param {number} num The number that is to be encoded.\n */\nexport const writeUint32BigEndian = (encoder, num) => {\n  for (let i = 3; i >= 0; i--) {\n    write(encoder, (num >>> (8 * i)) & binary.BITS8)\n  }\n}\n\n/**\n * Write two bytes as an unsigned integer at a specific location.\n *\n * @function\n * @param {Encoder} encoder\n * @param {number} pos The location where the data will be written.\n * @param {number} num The number that is to be encoded.\n */\nexport const setUint32 = (encoder, pos, num) => {\n  for (let i = 0; i < 4; i++) {\n    set(encoder, pos + i, num & binary.BITS8)\n    num >>>= 8\n  }\n}\n\n/**\n * Write a variable length unsigned integer. Max encodable integer is 2^53.\n *\n * @function\n * @param {Encoder} encoder\n * @param {number} num The number that is to be encoded.\n */\nexport const writeVarUint = (encoder, num) => {\n  while (num > binary.BITS7) {\n    write(encoder, binary.BIT8 | (binary.BITS7 & num))\n    num = math.floor(num / 128) // shift >>> 7\n  }\n  write(encoder, binary.BITS7 & num)\n}\n\n/**\n * Write a variable length integer.\n *\n * We use the 7th bit instead for signaling that this is a negative number.\n *\n * @function\n * @param {Encoder} encoder\n * @param {number} num The number that is to be encoded.\n */\nexport const writeVarInt = (encoder, num) => {\n  const isNegative = math.isNegativeZero(num)\n  if (isNegative) {\n    num = -num\n  }\n  //             |- whether to continue reading         |- whether is negative     |- number\n  write(encoder, (num > binary.BITS6 ? binary.BIT8 : 0) | (isNegative ? binary.BIT7 : 0) | (binary.BITS6 & num))\n  num = math.floor(num / 64) // shift >>> 6\n  // We don't need to consider the case of num === 0 so we can use a different\n  // pattern here than above.\n  while (num > 0) {\n    write(encoder, (num > binary.BITS7 ? binary.BIT8 : 0) | (binary.BITS7 & num))\n    num = math.floor(num / 128) // shift >>> 7\n  }\n}\n\n/**\n * A cache to store strings temporarily\n */\nconst _strBuffer = new Uint8Array(30000)\nconst _maxStrBSize = _strBuffer.length / 3\n\n/**\n * Write a variable length string.\n *\n * @function\n * @param {Encoder} encoder\n * @param {String} str The string that is to be encoded.\n */\nexport const _writeVarStringNative = (encoder, str) => {\n  if (str.length < _maxStrBSize) {\n    // We can encode the string into the existing buffer\n    /* c8 ignore next */\n    const written = string.utf8TextEncoder.encodeInto(str, _strBuffer).written || 0\n    writeVarUint(encoder, written)\n    for (let i = 0; i < written; i++) {\n      write(encoder, _strBuffer[i])\n    }\n  } else {\n    writeVarUint8Array(encoder, string.encodeUtf8(str))\n  }\n}\n\n/**\n * Write a variable length string.\n *\n * @function\n * @param {Encoder} encoder\n * @param {String} str The string that is to be encoded.\n */\nexport const _writeVarStringPolyfill = (encoder, str) => {\n  const encodedString = unescape(encodeURIComponent(str))\n  const len = encodedString.length\n  writeVarUint(encoder, len)\n  for (let i = 0; i < len; i++) {\n    write(encoder, /** @type {number} */ (encodedString.codePointAt(i)))\n  }\n}\n\n/**\n * Write a variable length string.\n *\n * @function\n * @param {Encoder} encoder\n * @param {String} str The string that is to be encoded.\n */\n/* c8 ignore next */\nexport const writeVarString = (string.utf8TextEncoder && /** @type {any} */ (string.utf8TextEncoder).encodeInto) ? _writeVarStringNative : _writeVarStringPolyfill\n\n/**\n * Write a string terminated by a special byte sequence. This is not very performant and is\n * generally discouraged. However, the resulting byte arrays are lexiographically ordered which\n * makes this a nice feature for databases.\n *\n * The string will be encoded using utf8 and then terminated and escaped using writeTerminatingUint8Array.\n *\n * @function\n * @param {Encoder} encoder\n * @param {String} str The string that is to be encoded.\n */\nexport const writeTerminatedString = (encoder, str) =>\n  writeTerminatedUint8Array(encoder, string.encodeUtf8(str))\n\n/**\n * Write a terminating Uint8Array. Note that this is not performant and is generally\n * discouraged. There are few situations when this is needed.\n *\n * We use 0x0 as a terminating character. 0x1 serves as an escape character for 0x0 and 0x1.\n *\n * Example: [0,1,2] is encoded to [1,0,1,1,2,0]. 0x0, and 0x1 needed to be escaped using 0x1. Then\n * the result is terminated using the 0x0 character.\n *\n * This is basically how many systems implement null terminated strings. However, we use an escape\n * character 0x1 to avoid issues and potenial attacks on our database (if this is used as a key\n * encoder for NoSql databases).\n *\n * @function\n * @param {Encoder} encoder\n * @param {Uint8Array} buf The string that is to be encoded.\n */\nexport const writeTerminatedUint8Array = (encoder, buf) => {\n  for (let i = 0; i < buf.length; i++) {\n    const b = buf[i]\n    if (b === 0 || b === 1) {\n      write(encoder, 1)\n    }\n    write(encoder, buf[i])\n  }\n  write(encoder, 0)\n}\n\n/**\n * Write the content of another Encoder.\n *\n * @TODO: can be improved!\n *        - Note: Should consider that when appending a lot of small Encoders, we should rather clone than referencing the old structure.\n *                Encoders start with a rather big initial buffer.\n *\n * @function\n * @param {Encoder} encoder The enUint8Arr\n * @param {Encoder} append The BinaryEncoder to be written.\n */\nexport const writeBinaryEncoder = (encoder, append) => writeUint8Array(encoder, toUint8Array(append))\n\n/**\n * Append fixed-length Uint8Array to the encoder.\n *\n * @function\n * @param {Encoder} encoder\n * @param {Uint8Array} uint8Array\n */\nexport const writeUint8Array = (encoder, uint8Array) => {\n  const bufferLen = encoder.cbuf.length\n  const cpos = encoder.cpos\n  const leftCopyLen = math.min(bufferLen - cpos, uint8Array.length)\n  const rightCopyLen = uint8Array.length - leftCopyLen\n  encoder.cbuf.set(uint8Array.subarray(0, leftCopyLen), cpos)\n  encoder.cpos += leftCopyLen\n  if (rightCopyLen > 0) {\n    // Still something to write, write right half..\n    // Append new buffer\n    encoder.bufs.push(encoder.cbuf)\n    // must have at least size of remaining buffer\n    encoder.cbuf = new Uint8Array(math.max(bufferLen * 2, rightCopyLen))\n    // copy array\n    encoder.cbuf.set(uint8Array.subarray(leftCopyLen))\n    encoder.cpos = rightCopyLen\n  }\n}\n\n/**\n * Append an Uint8Array to Encoder.\n *\n * @function\n * @param {Encoder} encoder\n * @param {Uint8Array} uint8Array\n */\nexport const writeVarUint8Array = (encoder, uint8Array) => {\n  writeVarUint(encoder, uint8Array.byteLength)\n  writeUint8Array(encoder, uint8Array)\n}\n\n/**\n * Create an DataView of the next `len` bytes. Use it to write data after\n * calling this function.\n *\n * ```js\n * // write float32 using DataView\n * const dv = writeOnDataView(encoder, 4)\n * dv.setFloat32(0, 1.1)\n * // read float32 using DataView\n * const dv = readFromDataView(encoder, 4)\n * dv.getFloat32(0) // => 1.100000023841858 (leaving it to the reader to find out why this is the correct result)\n * ```\n *\n * @param {Encoder} encoder\n * @param {number} len\n * @return {DataView}\n */\nexport const writeOnDataView = (encoder, len) => {\n  verifyLen(encoder, len)\n  const dview = new DataView(encoder.cbuf.buffer, encoder.cpos, len)\n  encoder.cpos += len\n  return dview\n}\n\n/**\n * @param {Encoder} encoder\n * @param {number} num\n */\nexport const writeFloat32 = (encoder, num) => writeOnDataView(encoder, 4).setFloat32(0, num, false)\n\n/**\n * @param {Encoder} encoder\n * @param {number} num\n */\nexport const writeFloat64 = (encoder, num) => writeOnDataView(encoder, 8).setFloat64(0, num, false)\n\n/**\n * @param {Encoder} encoder\n * @param {bigint} num\n */\nexport const writeBigInt64 = (encoder, num) => /** @type {any} */ (writeOnDataView(encoder, 8)).setBigInt64(0, num, false)\n\n/**\n * @param {Encoder} encoder\n * @param {bigint} num\n */\nexport const writeBigUint64 = (encoder, num) => /** @type {any} */ (writeOnDataView(encoder, 8)).setBigUint64(0, num, false)\n\nconst floatTestBed = new DataView(new ArrayBuffer(4))\n/**\n * Check if a number can be encoded as a 32 bit float.\n *\n * @param {number} num\n * @return {boolean}\n */\nconst isFloat32 = num => {\n  floatTestBed.setFloat32(0, num)\n  return floatTestBed.getFloat32(0) === num\n}\n\n/**\n * Encode data with efficient binary format.\n *\n * Differences to JSON:\n * • Transforms data to a binary format (not to a string)\n * • Encodes undefined, NaN, and ArrayBuffer (these can't be represented in JSON)\n * • Numbers are efficiently encoded either as a variable length integer, as a\n *   32 bit float, as a 64 bit float, or as a 64 bit bigint.\n *\n * Encoding table:\n *\n * | Data Type           | Prefix   | Encoding Method    | Comment |\n * | ------------------- | -------- | ------------------ | ------- |\n * | undefined           | 127      |                    | Functions, symbol, and everything that cannot be identified is encoded as undefined |\n * | null                | 126      |                    | |\n * | integer             | 125      | writeVarInt        | Only encodes 32 bit signed integers |\n * | float32             | 124      | writeFloat32       | |\n * | float64             | 123      | writeFloat64       | |\n * | bigint              | 122      | writeBigInt64      | |\n * | boolean (false)     | 121      |                    | True and false are different data types so we save the following byte |\n * | boolean (true)      | 120      |                    | - 0b01111000 so the last bit determines whether true or false |\n * | string              | 119      | writeVarString     | |\n * | object<string,any>  | 118      | custom             | Writes {length} then {length} key-value pairs |\n * | array<any>          | 117      | custom             | Writes {length} then {length} json values |\n * | Uint8Array          | 116      | writeVarUint8Array | We use Uint8Array for any kind of binary data |\n *\n * Reasons for the decreasing prefix:\n * We need the first bit for extendability (later we may want to encode the\n * prefix with writeVarUint). The remaining 7 bits are divided as follows:\n * [0-30]   the beginning of the data range is used for custom purposes\n *          (defined by the function that uses this library)\n * [31-127] the end of the data range is used for data encoding by\n *          lib0/encoding.js\n *\n * @param {Encoder} encoder\n * @param {undefined|null|number|bigint|boolean|string|Object<string,any>|Array<any>|Uint8Array} data\n */\nexport const writeAny = (encoder, data) => {\n  switch (typeof data) {\n    case 'string':\n      // TYPE 119: STRING\n      write(encoder, 119)\n      writeVarString(encoder, data)\n      break\n    case 'number':\n      if (number.isInteger(data) && math.abs(data) <= binary.BITS31) {\n        // TYPE 125: INTEGER\n        write(encoder, 125)\n        writeVarInt(encoder, data)\n      } else if (isFloat32(data)) {\n        // TYPE 124: FLOAT32\n        write(encoder, 124)\n        writeFloat32(encoder, data)\n      } else {\n        // TYPE 123: FLOAT64\n        write(encoder, 123)\n        writeFloat64(encoder, data)\n      }\n      break\n    case 'bigint':\n      // TYPE 122: BigInt\n      write(encoder, 122)\n      writeBigInt64(encoder, data)\n      break\n    case 'object':\n      if (data === null) {\n        // TYPE 126: null\n        write(encoder, 126)\n      } else if (array.isArray(data)) {\n        // TYPE 117: Array\n        write(encoder, 117)\n        writeVarUint(encoder, data.length)\n        for (let i = 0; i < data.length; i++) {\n          writeAny(encoder, data[i])\n        }\n      } else if (data instanceof Uint8Array) {\n        // TYPE 116: ArrayBuffer\n        write(encoder, 116)\n        writeVarUint8Array(encoder, data)\n      } else {\n        // TYPE 118: Object\n        write(encoder, 118)\n        const keys = Object.keys(data)\n        writeVarUint(encoder, keys.length)\n        for (let i = 0; i < keys.length; i++) {\n          const key = keys[i]\n          writeVarString(encoder, key)\n          writeAny(encoder, data[key])\n        }\n      }\n      break\n    case 'boolean':\n      // TYPE 120/121: boolean (true/false)\n      write(encoder, data ? 120 : 121)\n      break\n    default:\n      // TYPE 127: undefined\n      write(encoder, 127)\n  }\n}\n\n/**\n * Now come a few stateful encoder that have their own classes.\n */\n\n/**\n * Basic Run Length Encoder - a basic compression implementation.\n *\n * Encodes [1,1,1,7] to [1,3,7,1] (3 times 1, 1 time 7). This encoder might do more harm than good if there are a lot of values that are not repeated.\n *\n * It was originally used for image compression. Cool .. article http://csbruce.com/cbm/transactor/pdfs/trans_v7_i06.pdf\n *\n * @note T must not be null!\n *\n * @template T\n */\nexport class RleEncoder extends Encoder {\n  /**\n   * @param {function(Encoder, T):void} writer\n   */\n  constructor (writer) {\n    super()\n    /**\n     * The writer\n     */\n    this.w = writer\n    /**\n     * Current state\n     * @type {T|null}\n     */\n    this.s = null\n    this.count = 0\n  }\n\n  /**\n   * @param {T} v\n   */\n  write (v) {\n    if (this.s === v) {\n      this.count++\n    } else {\n      if (this.count > 0) {\n        // flush counter, unless this is the first value (count = 0)\n        writeVarUint(this, this.count - 1) // since count is always > 0, we can decrement by one. non-standard encoding ftw\n      }\n      this.count = 1\n      // write first value\n      this.w(this, v)\n      this.s = v\n    }\n  }\n}\n\n/**\n * Basic diff decoder using variable length encoding.\n *\n * Encodes the values [3, 1100, 1101, 1050, 0] to [3, 1097, 1, -51, -1050] using writeVarInt.\n */\nexport class IntDiffEncoder extends Encoder {\n  /**\n   * @param {number} start\n   */\n  constructor (start) {\n    super()\n    /**\n     * Current state\n     * @type {number}\n     */\n    this.s = start\n  }\n\n  /**\n   * @param {number} v\n   */\n  write (v) {\n    writeVarInt(this, v - this.s)\n    this.s = v\n  }\n}\n\n/**\n * A combination of IntDiffEncoder and RleEncoder.\n *\n * Basically first writes the IntDiffEncoder and then counts duplicate diffs using RleEncoding.\n *\n * Encodes the values [1,1,1,2,3,4,5,6] as [1,1,0,2,1,5] (RLE([1,0,0,1,1,1,1,1]) ⇒ RleIntDiff[1,1,0,2,1,5])\n */\nexport class RleIntDiffEncoder extends Encoder {\n  /**\n   * @param {number} start\n   */\n  constructor (start) {\n    super()\n    /**\n     * Current state\n     * @type {number}\n     */\n    this.s = start\n    this.count = 0\n  }\n\n  /**\n   * @param {number} v\n   */\n  write (v) {\n    if (this.s === v && this.count > 0) {\n      this.count++\n    } else {\n      if (this.count > 0) {\n        // flush counter, unless this is the first value (count = 0)\n        writeVarUint(this, this.count - 1) // since count is always > 0, we can decrement by one. non-standard encoding ftw\n      }\n      this.count = 1\n      // write first value\n      writeVarInt(this, v - this.s)\n      this.s = v\n    }\n  }\n}\n\n/**\n * @param {UintOptRleEncoder} encoder\n */\nconst flushUintOptRleEncoder = encoder => {\n  if (encoder.count > 0) {\n    // flush counter, unless this is the first value (count = 0)\n    // case 1: just a single value. set sign to positive\n    // case 2: write several values. set sign to negative to indicate that there is a length coming\n    writeVarInt(encoder.encoder, encoder.count === 1 ? encoder.s : -encoder.s)\n    if (encoder.count > 1) {\n      writeVarUint(encoder.encoder, encoder.count - 2) // since count is always > 1, we can decrement by one. non-standard encoding ftw\n    }\n  }\n}\n\n/**\n * Optimized Rle encoder that does not suffer from the mentioned problem of the basic Rle encoder.\n *\n * Internally uses VarInt encoder to write unsigned integers. If the input occurs multiple times, we write\n * write it as a negative number. The UintOptRleDecoder then understands that it needs to read a count.\n *\n * Encodes [1,2,3,3,3] as [1,2,-3,3] (once 1, once 2, three times 3)\n */\nexport class UintOptRleEncoder {\n  constructor () {\n    this.encoder = new Encoder()\n    /**\n     * @type {number}\n     */\n    this.s = 0\n    this.count = 0\n  }\n\n  /**\n   * @param {number} v\n   */\n  write (v) {\n    if (this.s === v) {\n      this.count++\n    } else {\n      flushUintOptRleEncoder(this)\n      this.count = 1\n      this.s = v\n    }\n  }\n\n  /**\n   * Flush the encoded state and transform this to a Uint8Array.\n   *\n   * Note that this should only be called once.\n   */\n  toUint8Array () {\n    flushUintOptRleEncoder(this)\n    return toUint8Array(this.encoder)\n  }\n}\n\n/**\n * Increasing Uint Optimized RLE Encoder\n *\n * The RLE encoder counts the number of same occurences of the same value.\n * The IncUintOptRle encoder counts if the value increases.\n * I.e. 7, 8, 9, 10 will be encoded as [-7, 4]. 1, 3, 5 will be encoded\n * as [1, 3, 5].\n */\nexport class IncUintOptRleEncoder {\n  constructor () {\n    this.encoder = new Encoder()\n    /**\n     * @type {number}\n     */\n    this.s = 0\n    this.count = 0\n  }\n\n  /**\n   * @param {number} v\n   */\n  write (v) {\n    if (this.s + this.count === v) {\n      this.count++\n    } else {\n      flushUintOptRleEncoder(this)\n      this.count = 1\n      this.s = v\n    }\n  }\n\n  /**\n   * Flush the encoded state and transform this to a Uint8Array.\n   *\n   * Note that this should only be called once.\n   */\n  toUint8Array () {\n    flushUintOptRleEncoder(this)\n    return toUint8Array(this.encoder)\n  }\n}\n\n/**\n * @param {IntDiffOptRleEncoder} encoder\n */\nconst flushIntDiffOptRleEncoder = encoder => {\n  if (encoder.count > 0) {\n    //          31 bit making up the diff | wether to write the counter\n    // const encodedDiff = encoder.diff << 1 | (encoder.count === 1 ? 0 : 1)\n    const encodedDiff = encoder.diff * 2 + (encoder.count === 1 ? 0 : 1)\n    // flush counter, unless this is the first value (count = 0)\n    // case 1: just a single value. set first bit to positive\n    // case 2: write several values. set first bit to negative to indicate that there is a length coming\n    writeVarInt(encoder.encoder, encodedDiff)\n    if (encoder.count > 1) {\n      writeVarUint(encoder.encoder, encoder.count - 2) // since count is always > 1, we can decrement by one. non-standard encoding ftw\n    }\n  }\n}\n\n/**\n * A combination of the IntDiffEncoder and the UintOptRleEncoder.\n *\n * The count approach is similar to the UintDiffOptRleEncoder, but instead of using the negative bitflag, it encodes\n * in the LSB whether a count is to be read. Therefore this Encoder only supports 31 bit integers!\n *\n * Encodes [1, 2, 3, 2] as [3, 1, 6, -1] (more specifically [(1 << 1) | 1, (3 << 0) | 0, -1])\n *\n * Internally uses variable length encoding. Contrary to normal UintVar encoding, the first byte contains:\n * * 1 bit that denotes whether the next value is a count (LSB)\n * * 1 bit that denotes whether this value is negative (MSB - 1)\n * * 1 bit that denotes whether to continue reading the variable length integer (MSB)\n *\n * Therefore, only five bits remain to encode diff ranges.\n *\n * Use this Encoder only when appropriate. In most cases, this is probably a bad idea.\n */\nexport class IntDiffOptRleEncoder {\n  constructor () {\n    this.encoder = new Encoder()\n    /**\n     * @type {number}\n     */\n    this.s = 0\n    this.count = 0\n    this.diff = 0\n  }\n\n  /**\n   * @param {number} v\n   */\n  write (v) {\n    if (this.diff === v - this.s) {\n      this.s = v\n      this.count++\n    } else {\n      flushIntDiffOptRleEncoder(this)\n      this.count = 1\n      this.diff = v - this.s\n      this.s = v\n    }\n  }\n\n  /**\n   * Flush the encoded state and transform this to a Uint8Array.\n   *\n   * Note that this should only be called once.\n   */\n  toUint8Array () {\n    flushIntDiffOptRleEncoder(this)\n    return toUint8Array(this.encoder)\n  }\n}\n\n/**\n * Optimized String Encoder.\n *\n * Encoding many small strings in a simple Encoder is not very efficient. The function call to decode a string takes some time and creates references that must be eventually deleted.\n * In practice, when decoding several million small strings, the GC will kick in more and more often to collect orphaned string objects (or maybe there is another reason?).\n *\n * This string encoder solves the above problem. All strings are concatenated and written as a single string using a single encoding call.\n *\n * The lengths are encoded using a UintOptRleEncoder.\n */\nexport class StringEncoder {\n  constructor () {\n    /**\n     * @type {Array<string>}\n     */\n    this.sarr = []\n    this.s = ''\n    this.lensE = new UintOptRleEncoder()\n  }\n\n  /**\n   * @param {string} string\n   */\n  write (string) {\n    this.s += string\n    if (this.s.length > 19) {\n      this.sarr.push(this.s)\n      this.s = ''\n    }\n    this.lensE.write(string.length)\n  }\n\n  toUint8Array () {\n    const encoder = new Encoder()\n    this.sarr.push(this.s)\n    this.s = ''\n    writeVarString(encoder, this.sarr.join(''))\n    writeUint8Array(encoder, this.lensE.toUint8Array())\n    return toUint8Array(encoder)\n  }\n}\n","/**\n * Isomorphic module to work access the environment (query params, env variables).\n *\n * @module map\n */\n\nimport * as map from './map.js'\nimport * as string from './string.js'\nimport * as conditions from './conditions.js'\nimport * as storage from './storage.js'\nimport * as f from './function.js'\n\n/* c8 ignore next 2 */\n// @ts-ignore\nexport const isNode = typeof process !== 'undefined' && process.release && /node|io\\.js/.test(process.release.name) && Object.prototype.toString.call(typeof process !== 'undefined' ? process : 0) === '[object process]'\n\n/* c8 ignore next */\nexport const isBrowser = typeof window !== 'undefined' && typeof document !== 'undefined' && !isNode\n/* c8 ignore next 3 */\nexport const isMac = typeof navigator !== 'undefined'\n  ? /Mac/.test(navigator.platform)\n  : false\n\n/**\n * @type {Map<string,string>}\n */\nlet params\nconst args = []\n\n/* c8 ignore start */\nconst computeParams = () => {\n  if (params === undefined) {\n    if (isNode) {\n      params = map.create()\n      const pargs = process.argv\n      let currParamName = null\n      for (let i = 0; i < pargs.length; i++) {\n        const parg = pargs[i]\n        if (parg[0] === '-') {\n          if (currParamName !== null) {\n            params.set(currParamName, '')\n          }\n          currParamName = parg\n        } else {\n          if (currParamName !== null) {\n            params.set(currParamName, parg)\n            currParamName = null\n          } else {\n            args.push(parg)\n          }\n        }\n      }\n      if (currParamName !== null) {\n        params.set(currParamName, '')\n      }\n      // in ReactNative for example this would not be true (unless connected to the Remote Debugger)\n    } else if (typeof location === 'object') {\n      params = map.create(); // eslint-disable-next-line no-undef\n      (location.search || '?').slice(1).split('&').forEach((kv) => {\n        if (kv.length !== 0) {\n          const [key, value] = kv.split('=')\n          params.set(`--${string.fromCamelCase(key, '-')}`, value)\n          params.set(`-${string.fromCamelCase(key, '-')}`, value)\n        }\n      })\n    } else {\n      params = map.create()\n    }\n  }\n  return params\n}\n/* c8 ignore stop */\n\n/**\n * @param {string} name\n * @return {boolean}\n */\n/* c8 ignore next */\nexport const hasParam = (name) => computeParams().has(name)\n\n/**\n * @param {string} name\n * @param {string} defaultVal\n * @return {string}\n */\n/* c8 ignore next 2 */\nexport const getParam = (name, defaultVal) =>\n  computeParams().get(name) || defaultVal\n\n/**\n * @param {string} name\n * @return {string|null}\n */\n/* c8 ignore next 4 */\nexport const getVariable = (name) =>\n  isNode\n    ? conditions.undefinedToNull(process.env[name.toUpperCase().replaceAll('-', '_')])\n    : conditions.undefinedToNull(storage.varStorage.getItem(name))\n\n/**\n * @param {string} name\n * @return {string|null}\n */\n/* c8 ignore next 2 */\nexport const getConf = (name) =>\n  computeParams().get('--' + name) || getVariable(name)\n\n/**\n * @param {string} name\n * @return {string}\n */\n/* c8 ignore next 5 */\nexport const ensureConf = (name) => {\n  const c = getConf(name)\n  if (c == null) throw new Error(`Expected configuration \"${name.toUpperCase().replaceAll('-', '_')}\"`)\n  return c\n}\n\n/**\n * @param {string} name\n * @return {boolean}\n */\n/* c8 ignore next 2 */\nexport const hasConf = (name) =>\n  hasParam('--' + name) || getVariable(name) !== null\n\n/* c8 ignore next */\nexport const production = hasConf('production')\n\n/* c8 ignore next 2 */\nconst forceColor = isNode &&\n  f.isOneOf(process.env.FORCE_COLOR, ['true', '1', '2'])\n\n/* c8 ignore start */\n/**\n * Color is enabled by default if the terminal supports it.\n *\n * Explicitly enable color using `--color` parameter\n * Disable color using `--no-color` parameter or using `NO_COLOR=1` environment variable.\n * `FORCE_COLOR=1` enables color and takes precedence over all.\n */\nexport const supportsColor = forceColor || (\n  !hasParam('--no-colors') && // @todo deprecate --no-colors\n  !hasConf('no-color') &&\n  (!isNode || process.stdout.isTTY) && (\n    !isNode ||\n    hasParam('--color') ||\n    getVariable('COLORTERM') !== null ||\n    (getVariable('TERM') || '').includes('color')\n  )\n)\n/* c8 ignore stop */\n","/**\n * Often used conditions.\n *\n * @module conditions\n */\n\n/**\n * @template T\n * @param {T|null|undefined} v\n * @return {T|null}\n */\n/* c8 ignore next */\nexport const undefinedToNull = v => v === undefined ? null : v\n","/* eslint-env browser */\n\n/**\n * Isomorphic variable storage.\n *\n * Uses LocalStorage in the browser and falls back to in-memory storage.\n *\n * @module storage\n */\n\n/* c8 ignore start */\nclass VarStoragePolyfill {\n  constructor () {\n    this.map = new Map()\n  }\n\n  /**\n   * @param {string} key\n   * @param {any} newValue\n   */\n  setItem (key, newValue) {\n    this.map.set(key, newValue)\n  }\n\n  /**\n   * @param {string} key\n   */\n  getItem (key) {\n    return this.map.get(key)\n  }\n}\n/* c8 ignore stop */\n\n/**\n * @type {any}\n */\nlet _localStorage = new VarStoragePolyfill()\nlet usePolyfill = true\n\n/* c8 ignore start */\ntry {\n  // if the same-origin rule is violated, accessing localStorage might thrown an error\n  if (typeof localStorage !== 'undefined' && localStorage) {\n    _localStorage = localStorage\n    usePolyfill = false\n  }\n} catch (e) { }\n/* c8 ignore stop */\n\n/**\n * This is basically localStorage in browser, or a polyfill in nodejs\n */\n/* c8 ignore next */\nexport const varStorage = _localStorage\n\n/**\n * A polyfill for `addEventListener('storage', event => {..})` that does nothing if the polyfill is being used.\n *\n * @param {function({ key: string, newValue: string, oldValue: string }): void} eventHandler\n * @function\n */\n/* c8 ignore next */\nexport const onChange = eventHandler => usePolyfill || addEventListener('storage', /** @type {any} */ (eventHandler))\n\n/**\n * A polyfill for `removeEventListener('storage', event => {..})` that does nothing if the polyfill is being used.\n *\n * @param {function({ key: string, newValue: string, oldValue: string }): void} eventHandler\n * @function\n */\n/* c8 ignore next */\nexport const offChange = eventHandler => usePolyfill || removeEventListener('storage', /** @type {any} */ (eventHandler))\n","/**\n * Error helpers.\n *\n * @module error\n */\n\n/**\n * @param {string} s\n * @return {Error}\n */\n/* c8 ignore next */\nexport const create = s => new Error(s)\n\n/**\n * @throws {Error}\n * @return {never}\n */\n/* c8 ignore next 3 */\nexport const methodUnimplemented = () => {\n  throw create('Method unimplemented')\n}\n\n/**\n * @throws {Error}\n * @return {never}\n */\n/* c8 ignore next 3 */\nexport const unexpectedCase = () => {\n  throw create('Unexpected case')\n}\n","/**\n * Common functions and function call helpers.\n *\n * @module function\n */\n\nimport * as array from './array.js'\nimport * as object from './object.js'\n\n/**\n * Calls all functions in `fs` with args. Only throws after all functions were called.\n *\n * @param {Array<function>} fs\n * @param {Array<any>} args\n */\nexport const callAll = (fs, args, i = 0) => {\n  try {\n    for (; i < fs.length; i++) {\n      fs[i](...args)\n    }\n  } finally {\n    if (i < fs.length) {\n      callAll(fs, args, i + 1)\n    }\n  }\n}\n\nexport const nop = () => {}\n\n/**\n * @template T\n * @param {function():T} f\n * @return {T}\n */\nexport const apply = f => f()\n\n/**\n * @template A\n *\n * @param {A} a\n * @return {A}\n */\nexport const id = a => a\n\n/**\n * @template T\n *\n * @param {T} a\n * @param {T} b\n * @return {boolean}\n */\nexport const equalityStrict = (a, b) => a === b\n\n/**\n * @template T\n *\n * @param {Array<T>|object} a\n * @param {Array<T>|object} b\n * @return {boolean}\n */\nexport const equalityFlat = (a, b) => a === b || (a != null && b != null && a.constructor === b.constructor && ((array.isArray(a) && array.equalFlat(a, /** @type {Array<T>} */ (b))) || (typeof a === 'object' && object.equalFlat(a, b))))\n\n/* c8 ignore start */\n\n/**\n * @param {any} a\n * @param {any} b\n * @return {boolean}\n */\nexport const equalityDeep = (a, b) => {\n  if (a == null || b == null) {\n    return equalityStrict(a, b)\n  }\n  if (a.constructor !== b.constructor) {\n    return false\n  }\n  if (a === b) {\n    return true\n  }\n  switch (a.constructor) {\n    case ArrayBuffer:\n      a = new Uint8Array(a)\n      b = new Uint8Array(b)\n    // eslint-disable-next-line no-fallthrough\n    case Uint8Array: {\n      if (a.byteLength !== b.byteLength) {\n        return false\n      }\n      for (let i = 0; i < a.length; i++) {\n        if (a[i] !== b[i]) {\n          return false\n        }\n      }\n      break\n    }\n    case Set: {\n      if (a.size !== b.size) {\n        return false\n      }\n      for (const value of a) {\n        if (!b.has(value)) {\n          return false\n        }\n      }\n      break\n    }\n    case Map: {\n      if (a.size !== b.size) {\n        return false\n      }\n      for (const key of a.keys()) {\n        if (!b.has(key) || !equalityDeep(a.get(key), b.get(key))) {\n          return false\n        }\n      }\n      break\n    }\n    case Object:\n      if (object.length(a) !== object.length(b)) {\n        return false\n      }\n      for (const key in a) {\n        if (!object.hasProperty(a, key) || !equalityDeep(a[key], b[key])) {\n          return false\n        }\n      }\n      break\n    case Array:\n      if (a.length !== b.length) {\n        return false\n      }\n      for (let i = 0; i < a.length; i++) {\n        if (!equalityDeep(a[i], b[i])) {\n          return false\n        }\n      }\n      break\n    default:\n      return false\n  }\n  return true\n}\n\n/**\n * @template V\n * @template {V} OPTS\n *\n * @param {V} value\n * @param {Array<OPTS>} options\n */\n// @ts-ignore\nexport const isOneOf = (value, options) => options.includes(value)\n/* c8 ignore stop */\n\nexport const isArray = array.isArray\n\n/**\n * @param {any} s\n * @return {s is String}\n */\nexport const isString = (s) => s && s.constructor === String\n\n/**\n * @param {any} n\n * @return {n is Number}\n */\nexport const isNumber = n => n != null && n.constructor === Number\n\n/**\n * @template {abstract new (...args: any) => any} TYPE\n * @param {any} n\n * @param {TYPE} T\n * @return {n is InstanceType<TYPE>}\n */\nexport const is = (n, T) => n && n.constructor === T\n\n/**\n * @template {abstract new (...args: any) => any} TYPE\n * @param {TYPE} T\n */\nexport const isTemplate = (T) =>\n  /**\n   * @param {any} n\n   * @return {n is InstanceType<TYPE>}\n   **/\n  n => n && n.constructor === T\n","/**\n * @module sha256\n * Spec: https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.180-4.pdf\n * Resources:\n * - https://web.archive.org/web/20150315061807/http://csrc.nist.gov/groups/STM/cavp/documents/shs/sha256-384-512.pdf\n */\n\nimport * as binary from '../binary.js'\n\n/**\n * @param {number} w - a 32bit uint\n * @param {number} shift\n */\nconst rotr = (w, shift) => (w >>> shift) | (w << (32 - shift))\n\n/**\n * Helper for SHA-224 & SHA-256. See 4.1.2.\n * @param {number} x\n */\nconst sum0to256 = x => rotr(x, 2) ^ rotr(x, 13) ^ rotr(x, 22)\n\n/**\n * Helper for SHA-224 & SHA-256. See 4.1.2.\n * @param {number} x\n */\nconst sum1to256 = x => rotr(x, 6) ^ rotr(x, 11) ^ rotr(x, 25)\n\n/**\n * Helper for SHA-224 & SHA-256. See 4.1.2.\n * @param {number} x\n */\nconst sigma0to256 = x => rotr(x, 7) ^ rotr(x, 18) ^ x >>> 3\n\n/**\n * Helper for SHA-224 & SHA-256. See 4.1.2.\n * @param {number} x\n */\nconst sigma1to256 = x => rotr(x, 17) ^ rotr(x, 19) ^ x >>> 10\n\n// @todo don't init these variables globally\n\n/**\n * See 4.2.2: Constant for sha256 & sha224\n * These words represent the first thirty-two bits of the fractional parts of\n * the cube roots of the first sixty-four prime numbers. In hex, these constant words are (from left to\n * right)\n */\nconst K = new Uint32Array([\n  0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,\n  0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,\n  0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,\n  0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,\n  0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,\n  0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,\n  0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,\n  0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2\n])\n\n/**\n * See 5.3.3. Initial hash value.\n *\n * These words were obtained by taking the first thirty-two bits of the fractional parts of the\n * square roots of the first eight prime numbers.\n *\n * @todo shouldn't be a global variable\n */\nconst HINIT = new Uint32Array([\n  0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19\n])\n\n// time to beat: (large value < 4.35s)\n\nclass Hasher {\n  constructor () {\n    const buf = new ArrayBuffer(64 + 64 * 4)\n    // Init working variables using a single arraybuffer\n    this._H = new Uint32Array(buf, 0, 8)\n    this._H.set(HINIT)\n    // \"Message schedule\" - a working variable\n    this._W = new Uint32Array(buf, 64, 64)\n  }\n\n  _updateHash () {\n    const H = this._H\n    const W = this._W\n    for (let t = 16; t < 64; t++) {\n      W[t] = sigma1to256(W[t - 2]) + W[t - 7] + sigma0to256(W[t - 15]) + W[t - 16]\n    }\n    let a = H[0]\n    let b = H[1]\n    let c = H[2]\n    let d = H[3]\n    let e = H[4]\n    let f = H[5]\n    let g = H[6]\n    let h = H[7]\n    for (let tt = 0, T1, T2; tt < 64; tt++) {\n      T1 = (h + sum1to256(e) + ((e & f) ^ (~e & g)) + K[tt] + W[tt]) >>> 0\n      T2 = (sum0to256(a) + ((a & b) ^ (a & c) ^ (b & c))) >>> 0\n      h = g\n      g = f\n      f = e\n      e = (d + T1) >>> 0\n      d = c\n      c = b\n      b = a\n      a = (T1 + T2) >>> 0\n    }\n    H[0] += a\n    H[1] += b\n    H[2] += c\n    H[3] += d\n    H[4] += e\n    H[5] += f\n    H[6] += g\n    H[7] += h\n  }\n\n  /**\n   * @param {Uint8Array} data\n   */\n  digest (data) {\n    let i = 0\n    for (; i + 56 <= data.length;) {\n      // write data in big endianess\n      let j = 0\n      for (; j < 16 && i + 3 < data.length; j++) {\n        this._W[j] = data[i++] << 24 | data[i++] << 16 | data[i++] << 8 | data[i++]\n      }\n      if (i % 64 !== 0) { // there is still room to write partial content and the ending bit.\n        this._W.fill(0, j, 16)\n        while (i < data.length) {\n          this._W[j] |= data[i] << ((3 - (i % 4)) * 8)\n          i++\n        }\n        this._W[j] |= binary.BIT8 << ((3 - (i % 4)) * 8)\n      }\n      this._updateHash()\n    }\n    // same check as earlier - the ending bit has been written\n    const isPaddedWith1 = i % 64 !== 0\n    this._W.fill(0, 0, 16)\n    let j = 0\n    for (; i < data.length; j++) {\n      for (let ci = 3; ci >= 0 && i < data.length; ci--) {\n        this._W[j] |= data[i++] << (ci * 8)\n      }\n    }\n    // Write padding of the message. See 5.1.2.\n    if (!isPaddedWith1) {\n      this._W[j - (i % 4 === 0 ? 0 : 1)] |= binary.BIT8 << ((3 - (i % 4)) * 8)\n    }\n    // write length of message (size in bits) as 64 bit uint\n    // @todo test that this works correctly\n    this._W[14] = data.byteLength / binary.BIT30 // same as data.byteLength >>> 30 - but works on floats\n    this._W[15] = data.byteLength * 8\n    this._updateHash()\n    // correct H endianness to use big endiannes and return a Uint8Array\n    const dv = new Uint8Array(32)\n    for (let i = 0; i < this._H.length; i++) {\n      for (let ci = 0; ci < 4; ci++) {\n        dv[i * 4 + ci] = this._H[i] >>> (3 - ci) * 8\n      }\n    }\n    return dv\n  }\n}\n\n/**\n * @param {Uint8Array} data\n */\nexport const digest = data => new Hasher().digest(data)\n","/**\n * Utility module to create and manipulate Iterators.\n *\n * @module iterator\n */\n\n/**\n * @template T,R\n * @param {Iterator<T>} iterator\n * @param {function(T):R} f\n * @return {IterableIterator<R>}\n */\nexport const mapIterator = (iterator, f) => ({\n  [Symbol.iterator] () {\n    return this\n  },\n  // @ts-ignore\n  next () {\n    const r = iterator.next()\n    return { value: r.done ? undefined : f(r.value), done: r.done }\n  }\n})\n\n/**\n * @template T\n * @param {function():IteratorResult<T>} next\n * @return {IterableIterator<T>}\n */\nexport const createIterator = next => ({\n  /**\n   * @return {IterableIterator<T>}\n   */\n  [Symbol.iterator] () {\n    return this\n  },\n  // @ts-ignore\n  next\n})\n\n/**\n * @template T\n * @param {Iterator<T>} iterator\n * @param {function(T):boolean} filter\n */\nexport const iteratorFilter = (iterator, filter) => createIterator(() => {\n  let res\n  do {\n    res = iterator.next()\n  } while (!res.done && !filter(res.value))\n  return res\n})\n\n/**\n * @template T,M\n * @param {Iterator<T>} iterator\n * @param {function(T):M} fmap\n */\nexport const iteratorMap = (iterator, fmap) => createIterator(() => {\n  const { done, value } = iterator.next()\n  return { done, value: done ? undefined : fmap(value) }\n})\n","/**\n * Utility module to work with EcmaScript Symbols.\n *\n * @module symbol\n */\n\n/**\n * Return fresh symbol.\n *\n * @return {Symbol}\n */\nexport const create = Symbol\n\n/**\n * @param {any} s\n * @return {boolean}\n */\nexport const isSymbol = s => typeof s === 'symbol'\n","import * as symbol from './symbol.js'\nimport * as time from './time.js'\nimport * as env from './environment.js'\nimport * as func from './function.js'\nimport * as json from './json.js'\n\nexport const BOLD = symbol.create()\nexport const UNBOLD = symbol.create()\nexport const BLUE = symbol.create()\nexport const GREY = symbol.create()\nexport const GREEN = symbol.create()\nexport const RED = symbol.create()\nexport const PURPLE = symbol.create()\nexport const ORANGE = symbol.create()\nexport const UNCOLOR = symbol.create()\n\n/* c8 ignore start */\n/**\n * @param {Array<undefined|string|Symbol|Object|number|function():any>} args\n * @return {Array<string|object|number|undefined>}\n */\nexport const computeNoColorLoggingArgs = args => {\n  if (args.length === 1 && args[0]?.constructor === Function) {\n    args = /** @type {Array<string|Symbol|Object|number>} */ (/** @type {[function]} */ (args)[0]())\n  }\n  const strBuilder = []\n  const logArgs = []\n  // try with formatting until we find something unsupported\n  let i = 0\n  for (; i < args.length; i++) {\n    const arg = args[i]\n    if (arg === undefined) {\n      break\n    } else if (arg.constructor === String || arg.constructor === Number) {\n      strBuilder.push(arg)\n    } else if (arg.constructor === Object) {\n      break\n    }\n  }\n  if (i > 0) {\n    // create logArgs with what we have so far\n    logArgs.push(strBuilder.join(''))\n  }\n  // append the rest\n  for (; i < args.length; i++) {\n    const arg = args[i]\n    if (!(arg instanceof Symbol)) {\n      logArgs.push(arg)\n    }\n  }\n  return logArgs\n}\n/* c8 ignore stop */\n\nconst loggingColors = [GREEN, PURPLE, ORANGE, BLUE]\nlet nextColor = 0\nlet lastLoggingTime = time.getUnixTime()\n\n/* c8 ignore start */\n/**\n * @param {function(...any):void} _print\n * @param {string} moduleName\n * @return {function(...any):void}\n */\nexport const createModuleLogger = (_print, moduleName) => {\n  const color = loggingColors[nextColor]\n  const debugRegexVar = env.getVariable('log')\n  const doLogging = debugRegexVar !== null &&\n    (debugRegexVar === '*' || debugRegexVar === 'true' ||\n      new RegExp(debugRegexVar, 'gi').test(moduleName))\n  nextColor = (nextColor + 1) % loggingColors.length\n  moduleName += ': '\n  return !doLogging\n    ? func.nop\n    : (...args) => {\n        if (args.length === 1 && args[0]?.constructor === Function) {\n          args = args[0]()\n        }\n        const timeNow = time.getUnixTime()\n        const timeDiff = timeNow - lastLoggingTime\n        lastLoggingTime = timeNow\n        _print(\n          color,\n          moduleName,\n          UNCOLOR,\n          ...args.map((arg) => {\n            if (arg != null && arg.constructor === Uint8Array) {\n              arg = Array.from(arg)\n            }\n            const t = typeof arg\n            switch (t) {\n              case 'string':\n              case 'symbol':\n                return arg\n              default: {\n                return json.stringify(arg)\n              }\n            }\n          }),\n          color,\n          ' +' + timeDiff + 'ms'\n        )\n      }\n}\n/* c8 ignore stop */\n","/**\n * Working with value pairs.\n *\n * @module pair\n */\n\n/**\n * @template L,R\n */\nexport class Pair {\n  /**\n   * @param {L} left\n   * @param {R} right\n   */\n  constructor (left, right) {\n    this.left = left\n    this.right = right\n  }\n}\n\n/**\n * @template L,R\n * @param {L} left\n * @param {R} right\n * @return {Pair<L,R>}\n */\nexport const create = (left, right) => new Pair(left, right)\n\n/**\n * @template L,R\n * @param {R} right\n * @param {L} left\n * @return {Pair<L,R>}\n */\nexport const createReversed = (right, left) => new Pair(left, right)\n\n/**\n * @template L,R\n * @param {Array<Pair<L,R>>} arr\n * @param {function(L, R):any} f\n */\nexport const forEach = (arr, f) => arr.forEach(p => f(p.left, p.right))\n\n/**\n * @template L,R,X\n * @param {Array<Pair<L,R>>} arr\n * @param {function(L, R):X} f\n * @return {Array<X>}\n */\nexport const map = (arr, f) => arr.map(p => f(p.left, p.right))\n","/* eslint-env browser */\n\n/**\n * Utility module to work with the DOM.\n *\n * @module dom\n */\n\nimport * as pair from './pair.js'\nimport * as map from './map.js'\n\n/* c8 ignore start */\n/**\n * @type {Document}\n */\nexport const doc = /** @type {Document} */ (typeof document !== 'undefined' ? document : {})\n\n/**\n * @param {string} name\n * @return {HTMLElement}\n */\nexport const createElement = name => doc.createElement(name)\n\n/**\n * @return {DocumentFragment}\n */\nexport const createDocumentFragment = () => doc.createDocumentFragment()\n\n/**\n * @param {string} text\n * @return {Text}\n */\nexport const createTextNode = text => doc.createTextNode(text)\n\nexport const domParser = /** @type {DOMParser} */ (typeof DOMParser !== 'undefined' ? new DOMParser() : null)\n\n/**\n * @param {HTMLElement} el\n * @param {string} name\n * @param {Object} opts\n */\nexport const emitCustomEvent = (el, name, opts) => el.dispatchEvent(new CustomEvent(name, opts))\n\n/**\n * @param {Element} el\n * @param {Array<pair.Pair<string,string|boolean>>} attrs Array of key-value pairs\n * @return {Element}\n */\nexport const setAttributes = (el, attrs) => {\n  pair.forEach(attrs, (key, value) => {\n    if (value === false) {\n      el.removeAttribute(key)\n    } else if (value === true) {\n      el.setAttribute(key, '')\n    } else {\n      // @ts-ignore\n      el.setAttribute(key, value)\n    }\n  })\n  return el\n}\n\n/**\n * @param {Element} el\n * @param {Map<string, string>} attrs Array of key-value pairs\n * @return {Element}\n */\nexport const setAttributesMap = (el, attrs) => {\n  attrs.forEach((value, key) => { el.setAttribute(key, value) })\n  return el\n}\n\n/**\n * @param {Array<Node>|HTMLCollection} children\n * @return {DocumentFragment}\n */\nexport const fragment = children => {\n  const fragment = createDocumentFragment()\n  for (let i = 0; i < children.length; i++) {\n    appendChild(fragment, children[i])\n  }\n  return fragment\n}\n\n/**\n * @param {Element} parent\n * @param {Array<Node>} nodes\n * @return {Element}\n */\nexport const append = (parent, nodes) => {\n  appendChild(parent, fragment(nodes))\n  return parent\n}\n\n/**\n * @param {HTMLElement} el\n */\nexport const remove = el => el.remove()\n\n/**\n * @param {EventTarget} el\n * @param {string} name\n * @param {EventListener} f\n */\nexport const addEventListener = (el, name, f) => el.addEventListener(name, f)\n\n/**\n * @param {EventTarget} el\n * @param {string} name\n * @param {EventListener} f\n */\nexport const removeEventListener = (el, name, f) => el.removeEventListener(name, f)\n\n/**\n * @param {Node} node\n * @param {Array<pair.Pair<string,EventListener>>} listeners\n * @return {Node}\n */\nexport const addEventListeners = (node, listeners) => {\n  pair.forEach(listeners, (name, f) => addEventListener(node, name, f))\n  return node\n}\n\n/**\n * @param {Node} node\n * @param {Array<pair.Pair<string,EventListener>>} listeners\n * @return {Node}\n */\nexport const removeEventListeners = (node, listeners) => {\n  pair.forEach(listeners, (name, f) => removeEventListener(node, name, f))\n  return node\n}\n\n/**\n * @param {string} name\n * @param {Array<pair.Pair<string,string>|pair.Pair<string,boolean>>} attrs Array of key-value pairs\n * @param {Array<Node>} children\n * @return {Element}\n */\nexport const element = (name, attrs = [], children = []) =>\n  append(setAttributes(createElement(name), attrs), children)\n\n/**\n * @param {number} width\n * @param {number} height\n */\nexport const canvas = (width, height) => {\n  const c = /** @type {HTMLCanvasElement} */ (createElement('canvas'))\n  c.height = height\n  c.width = width\n  return c\n}\n\n/**\n * @param {string} t\n * @return {Text}\n */\nexport const text = createTextNode\n\n/**\n * @param {pair.Pair<string,string>} pair\n */\nexport const pairToStyleString = pair => `${pair.left}:${pair.right};`\n\n/**\n * @param {Array<pair.Pair<string,string>>} pairs\n * @return {string}\n */\nexport const pairsToStyleString = pairs => pairs.map(pairToStyleString).join('')\n\n/**\n * @param {Map<string,string>} m\n * @return {string}\n */\nexport const mapToStyleString = m => map.map(m, (value, key) => `${key}:${value};`).join('')\n\n/**\n * @todo should always query on a dom element\n *\n * @param {HTMLElement|ShadowRoot} el\n * @param {string} query\n * @return {HTMLElement | null}\n */\nexport const querySelector = (el, query) => el.querySelector(query)\n\n/**\n * @param {HTMLElement|ShadowRoot} el\n * @param {string} query\n * @return {NodeListOf<HTMLElement>}\n */\nexport const querySelectorAll = (el, query) => el.querySelectorAll(query)\n\n/**\n * @param {string} id\n * @return {HTMLElement}\n */\nexport const getElementById = id => /** @type {HTMLElement} */ (doc.getElementById(id))\n\n/**\n * @param {string} html\n * @return {HTMLElement}\n */\nconst _parse = html => domParser.parseFromString(`<html><body>${html}</body></html>`, 'text/html').body\n\n/**\n * @param {string} html\n * @return {DocumentFragment}\n */\nexport const parseFragment = html => fragment(/** @type {any} */ (_parse(html).childNodes))\n\n/**\n * @param {string} html\n * @return {HTMLElement}\n */\nexport const parseElement = html => /** @type HTMLElement */ (_parse(html).firstElementChild)\n\n/**\n * @param {HTMLElement} oldEl\n * @param {HTMLElement|DocumentFragment} newEl\n */\nexport const replaceWith = (oldEl, newEl) => oldEl.replaceWith(newEl)\n\n/**\n * @param {HTMLElement} parent\n * @param {HTMLElement} el\n * @param {Node|null} ref\n * @return {HTMLElement}\n */\nexport const insertBefore = (parent, el, ref) => parent.insertBefore(el, ref)\n\n/**\n * @param {Node} parent\n * @param {Node} child\n * @return {Node}\n */\nexport const appendChild = (parent, child) => parent.appendChild(child)\n\nexport const ELEMENT_NODE = doc.ELEMENT_NODE\nexport const TEXT_NODE = doc.TEXT_NODE\nexport const CDATA_SECTION_NODE = doc.CDATA_SECTION_NODE\nexport const COMMENT_NODE = doc.COMMENT_NODE\nexport const DOCUMENT_NODE = doc.DOCUMENT_NODE\nexport const DOCUMENT_TYPE_NODE = doc.DOCUMENT_TYPE_NODE\nexport const DOCUMENT_FRAGMENT_NODE = doc.DOCUMENT_FRAGMENT_NODE\n\n/**\n * @param {any} node\n * @param {number} type\n */\nexport const checkNodeType = (node, type) => node.nodeType === type\n\n/**\n * @param {Node} parent\n * @param {HTMLElement} child\n */\nexport const isParentOf = (parent, child) => {\n  let p = child.parentNode\n  while (p && p !== parent) {\n    p = p.parentNode\n  }\n  return p === parent\n}\n/* c8 ignore stop */\n","/**\n * Isomorphic logging module with support for colors!\n *\n * @module logging\n */\n\nimport * as env from './environment.js'\nimport * as set from './set.js'\nimport * as pair from './pair.js'\nimport * as dom from './dom.js'\nimport * as json from './json.js'\nimport * as map from './map.js'\nimport * as eventloop from './eventloop.js'\nimport * as math from './math.js'\nimport * as common from './logging.common.js'\n\nexport { BOLD, UNBOLD, BLUE, GREY, GREEN, RED, PURPLE, ORANGE, UNCOLOR } from './logging.common.js'\n\n/**\n * @type {Object<Symbol,pair.Pair<string,string>>}\n */\nconst _browserStyleMap = {\n  [common.BOLD]: pair.create('font-weight', 'bold'),\n  [common.UNBOLD]: pair.create('font-weight', 'normal'),\n  [common.BLUE]: pair.create('color', 'blue'),\n  [common.GREEN]: pair.create('color', 'green'),\n  [common.GREY]: pair.create('color', 'grey'),\n  [common.RED]: pair.create('color', 'red'),\n  [common.PURPLE]: pair.create('color', 'purple'),\n  [common.ORANGE]: pair.create('color', 'orange'), // not well supported in chrome when debugging node with inspector - TODO: deprecate\n  [common.UNCOLOR]: pair.create('color', 'black')\n}\n\n/**\n * @param {Array<string|Symbol|Object|number|function():any>} args\n * @return {Array<string|object|number>}\n */\n/* c8 ignore start */\nconst computeBrowserLoggingArgs = (args) => {\n  if (args.length === 1 && args[0]?.constructor === Function) {\n    args = /** @type {Array<string|Symbol|Object|number>} */ (/** @type {[function]} */ (args)[0]())\n  }\n  const strBuilder = []\n  const styles = []\n  const currentStyle = map.create()\n  /**\n   * @type {Array<string|Object|number>}\n   */\n  let logArgs = []\n  // try with formatting until we find something unsupported\n  let i = 0\n  for (; i < args.length; i++) {\n    const arg = args[i]\n    // @ts-ignore\n    const style = _browserStyleMap[arg]\n    if (style !== undefined) {\n      currentStyle.set(style.left, style.right)\n    } else {\n      if (arg === undefined) {\n        break\n      }\n      if (arg.constructor === String || arg.constructor === Number) {\n        const style = dom.mapToStyleString(currentStyle)\n        if (i > 0 || style.length > 0) {\n          strBuilder.push('%c' + arg)\n          styles.push(style)\n        } else {\n          strBuilder.push(arg)\n        }\n      } else {\n        break\n      }\n    }\n  }\n  if (i > 0) {\n    // create logArgs with what we have so far\n    logArgs = styles\n    logArgs.unshift(strBuilder.join(''))\n  }\n  // append the rest\n  for (; i < args.length; i++) {\n    const arg = args[i]\n    if (!(arg instanceof Symbol)) {\n      logArgs.push(arg)\n    }\n  }\n  return logArgs\n}\n/* c8 ignore stop */\n\n/* c8 ignore start */\nconst computeLoggingArgs = env.supportsColor\n  ? computeBrowserLoggingArgs\n  : common.computeNoColorLoggingArgs\n/* c8 ignore stop */\n\n/**\n * @param {Array<string|Symbol|Object|number>} args\n */\nexport const print = (...args) => {\n  console.log(...computeLoggingArgs(args))\n  /* c8 ignore next */\n  vconsoles.forEach((vc) => vc.print(args))\n}\n\n/* c8 ignore start */\n/**\n * @param {Array<string|Symbol|Object|number>} args\n */\nexport const warn = (...args) => {\n  console.warn(...computeLoggingArgs(args))\n  args.unshift(common.ORANGE)\n  vconsoles.forEach((vc) => vc.print(args))\n}\n/* c8 ignore stop */\n\n/**\n * @param {Error} err\n */\n/* c8 ignore start */\nexport const printError = (err) => {\n  console.error(err)\n  vconsoles.forEach((vc) => vc.printError(err))\n}\n/* c8 ignore stop */\n\n/**\n * @param {string} url image location\n * @param {number} height height of the image in pixel\n */\n/* c8 ignore start */\nexport const printImg = (url, height) => {\n  if (env.isBrowser) {\n    console.log(\n      '%c                      ',\n      `font-size: ${height}px; background-size: contain; background-repeat: no-repeat; background-image: url(${url})`\n    )\n    // console.log('%c                ', `font-size: ${height}x; background: url(${url}) no-repeat;`)\n  }\n  vconsoles.forEach((vc) => vc.printImg(url, height))\n}\n/* c8 ignore stop */\n\n/**\n * @param {string} base64\n * @param {number} height\n */\n/* c8 ignore next 2 */\nexport const printImgBase64 = (base64, height) =>\n  printImg(`data:image/gif;base64,${base64}`, height)\n\n/**\n * @param {Array<string|Symbol|Object|number>} args\n */\nexport const group = (...args) => {\n  console.group(...computeLoggingArgs(args))\n  /* c8 ignore next */\n  vconsoles.forEach((vc) => vc.group(args))\n}\n\n/**\n * @param {Array<string|Symbol|Object|number>} args\n */\nexport const groupCollapsed = (...args) => {\n  console.groupCollapsed(...computeLoggingArgs(args))\n  /* c8 ignore next */\n  vconsoles.forEach((vc) => vc.groupCollapsed(args))\n}\n\nexport const groupEnd = () => {\n  console.groupEnd()\n  /* c8 ignore next */\n  vconsoles.forEach((vc) => vc.groupEnd())\n}\n\n/**\n * @param {function():Node} createNode\n */\n/* c8 ignore next 2 */\nexport const printDom = (createNode) =>\n  vconsoles.forEach((vc) => vc.printDom(createNode()))\n\n/**\n * @param {HTMLCanvasElement} canvas\n * @param {number} height\n */\n/* c8 ignore next 2 */\nexport const printCanvas = (canvas, height) =>\n  printImg(canvas.toDataURL(), height)\n\nexport const vconsoles = set.create()\n\n/**\n * @param {Array<string|Symbol|Object|number>} args\n * @return {Array<Element>}\n */\n/* c8 ignore start */\nconst _computeLineSpans = (args) => {\n  const spans = []\n  const currentStyle = new Map()\n  // try with formatting until we find something unsupported\n  let i = 0\n  for (; i < args.length; i++) {\n    let arg = args[i]\n    // @ts-ignore\n    const style = _browserStyleMap[arg]\n    if (style !== undefined) {\n      currentStyle.set(style.left, style.right)\n    } else {\n      if (arg === undefined) {\n        arg = 'undefined '\n      }\n      if (arg.constructor === String || arg.constructor === Number) {\n        // @ts-ignore\n        const span = dom.element('span', [\n          pair.create('style', dom.mapToStyleString(currentStyle))\n        ], [dom.text(arg.toString())])\n        if (span.innerHTML === '') {\n          span.innerHTML = '&nbsp;'\n        }\n        spans.push(span)\n      } else {\n        break\n      }\n    }\n  }\n  // append the rest\n  for (; i < args.length; i++) {\n    let content = args[i]\n    if (!(content instanceof Symbol)) {\n      if (content.constructor !== String && content.constructor !== Number) {\n        content = ' ' + json.stringify(content) + ' '\n      }\n      spans.push(\n        dom.element('span', [], [dom.text(/** @type {string} */ (content))])\n      )\n    }\n  }\n  return spans\n}\n/* c8 ignore stop */\n\nconst lineStyle =\n  'font-family:monospace;border-bottom:1px solid #e2e2e2;padding:2px;'\n\n/* c8 ignore start */\nexport class VConsole {\n  /**\n   * @param {Element} dom\n   */\n  constructor (dom) {\n    this.dom = dom\n    /**\n     * @type {Element}\n     */\n    this.ccontainer = this.dom\n    this.depth = 0\n    vconsoles.add(this)\n  }\n\n  /**\n   * @param {Array<string|Symbol|Object|number>} args\n   * @param {boolean} collapsed\n   */\n  group (args, collapsed = false) {\n    eventloop.enqueue(() => {\n      const triangleDown = dom.element('span', [\n        pair.create('hidden', collapsed),\n        pair.create('style', 'color:grey;font-size:120%;')\n      ], [dom.text('▼')])\n      const triangleRight = dom.element('span', [\n        pair.create('hidden', !collapsed),\n        pair.create('style', 'color:grey;font-size:125%;')\n      ], [dom.text('▶')])\n      const content = dom.element(\n        'div',\n        [pair.create(\n          'style',\n          `${lineStyle};padding-left:${this.depth * 10}px`\n        )],\n        [triangleDown, triangleRight, dom.text(' ')].concat(\n          _computeLineSpans(args)\n        )\n      )\n      const nextContainer = dom.element('div', [\n        pair.create('hidden', collapsed)\n      ])\n      const nextLine = dom.element('div', [], [content, nextContainer])\n      dom.append(this.ccontainer, [nextLine])\n      this.ccontainer = nextContainer\n      this.depth++\n      // when header is clicked, collapse/uncollapse container\n      dom.addEventListener(content, 'click', (_event) => {\n        nextContainer.toggleAttribute('hidden')\n        triangleDown.toggleAttribute('hidden')\n        triangleRight.toggleAttribute('hidden')\n      })\n    })\n  }\n\n  /**\n   * @param {Array<string|Symbol|Object|number>} args\n   */\n  groupCollapsed (args) {\n    this.group(args, true)\n  }\n\n  groupEnd () {\n    eventloop.enqueue(() => {\n      if (this.depth > 0) {\n        this.depth--\n        // @ts-ignore\n        this.ccontainer = this.ccontainer.parentElement.parentElement\n      }\n    })\n  }\n\n  /**\n   * @param {Array<string|Symbol|Object|number>} args\n   */\n  print (args) {\n    eventloop.enqueue(() => {\n      dom.append(this.ccontainer, [\n        dom.element('div', [\n          pair.create(\n            'style',\n            `${lineStyle};padding-left:${this.depth * 10}px`\n          )\n        ], _computeLineSpans(args))\n      ])\n    })\n  }\n\n  /**\n   * @param {Error} err\n   */\n  printError (err) {\n    this.print([common.RED, common.BOLD, err.toString()])\n  }\n\n  /**\n   * @param {string} url\n   * @param {number} height\n   */\n  printImg (url, height) {\n    eventloop.enqueue(() => {\n      dom.append(this.ccontainer, [\n        dom.element('img', [\n          pair.create('src', url),\n          pair.create('height', `${math.round(height * 1.5)}px`)\n        ])\n      ])\n    })\n  }\n\n  /**\n   * @param {Node} node\n   */\n  printDom (node) {\n    eventloop.enqueue(() => {\n      dom.append(this.ccontainer, [node])\n    })\n  }\n\n  destroy () {\n    eventloop.enqueue(() => {\n      vconsoles.delete(this)\n    })\n  }\n}\n/* c8 ignore stop */\n\n/**\n * @param {Element} dom\n */\n/* c8 ignore next */\nexport const createVConsole = (dom) => new VConsole(dom)\n\n/**\n * @param {string} moduleName\n * @return {function(...any):void}\n */\nexport const createModuleLogger = (moduleName) => common.createModuleLogger(print, moduleName)\n","/**\n * Utility module to work with key-value stores.\n *\n * @module map\n */\n\n/**\n * Creates a new Map instance.\n *\n * @function\n * @return {Map<any, any>}\n *\n * @function\n */\nexport const create = () => new Map()\n\n/**\n * Copy a Map object into a fresh Map object.\n *\n * @function\n * @template K,V\n * @param {Map<K,V>} m\n * @return {Map<K,V>}\n */\nexport const copy = m => {\n  const r = create()\n  m.forEach((v, k) => { r.set(k, v) })\n  return r\n}\n\n/**\n * Get map property. Create T if property is undefined and set T on map.\n *\n * ```js\n * const listeners = map.setIfUndefined(events, 'eventName', set.create)\n * listeners.add(listener)\n * ```\n *\n * @function\n * @template {Map<any, any>} MAP\n * @template {MAP extends Map<any,infer V> ? function():V : unknown} CF\n * @param {MAP} map\n * @param {MAP extends Map<infer K,any> ? K : unknown} key\n * @param {CF} createT\n * @return {ReturnType<CF>}\n */\nexport const setIfUndefined = (map, key, createT) => {\n  let set = map.get(key)\n  if (set === undefined) {\n    map.set(key, set = createT())\n  }\n  return set\n}\n\n/**\n * Creates an Array and populates it with the content of all key-value pairs using the `f(value, key)` function.\n *\n * @function\n * @template K\n * @template V\n * @template R\n * @param {Map<K,V>} m\n * @param {function(V,K):R} f\n * @return {Array<R>}\n */\nexport const map = (m, f) => {\n  const res = []\n  for (const [key, value] of m) {\n    res.push(f(value, key))\n  }\n  return res\n}\n\n/**\n * Tests whether any key-value pairs pass the test implemented by `f(value, key)`.\n *\n * @todo should rename to some - similarly to Array.some\n *\n * @function\n * @template K\n * @template V\n * @param {Map<K,V>} m\n * @param {function(V,K):boolean} f\n * @return {boolean}\n */\nexport const any = (m, f) => {\n  for (const [key, value] of m) {\n    if (f(value, key)) {\n      return true\n    }\n  }\n  return false\n}\n\n/**\n * Tests whether all key-value pairs pass the test implemented by `f(value, key)`.\n *\n * @function\n * @template K\n * @template V\n * @param {Map<K,V>} m\n * @param {function(V,K):boolean} f\n * @return {boolean}\n */\nexport const all = (m, f) => {\n  for (const [key, value] of m) {\n    if (!f(value, key)) {\n      return false\n    }\n  }\n  return true\n}\n","/**\n * Common Math expressions.\n *\n * @module math\n */\n\nexport const floor = Math.floor\nexport const ceil = Math.ceil\nexport const abs = Math.abs\nexport const imul = Math.imul\nexport const round = Math.round\nexport const log10 = Math.log10\nexport const log2 = Math.log2\nexport const log = Math.log\nexport const sqrt = Math.sqrt\n\n/**\n * @function\n * @param {number} a\n * @param {number} b\n * @return {number} The sum of a and b\n */\nexport const add = (a, b) => a + b\n\n/**\n * @function\n * @param {number} a\n * @param {number} b\n * @return {number} The smaller element of a and b\n */\nexport const min = (a, b) => a < b ? a : b\n\n/**\n * @function\n * @param {number} a\n * @param {number} b\n * @return {number} The bigger element of a and b\n */\nexport const max = (a, b) => a > b ? a : b\n\nexport const isNaN = Number.isNaN\n\nexport const pow = Math.pow\n/**\n * Base 10 exponential function. Returns the value of 10 raised to the power of pow.\n *\n * @param {number} exp\n * @return {number}\n */\nexport const exp10 = exp => Math.pow(10, exp)\n\nexport const sign = Math.sign\n\n/**\n * @param {number} n\n * @return {boolean} Wether n is negative. This function also differentiates between -0 and +0\n */\nexport const isNegativeZero = n => n !== 0 ? n < 0 : 1 / n < 0\n","/**\n * Utility helpers for working with numbers.\n *\n * @module number\n */\n\nimport * as math from './math.js'\nimport * as binary from './binary.js'\n\nexport const MAX_SAFE_INTEGER = Number.MAX_SAFE_INTEGER\nexport const MIN_SAFE_INTEGER = Number.MIN_SAFE_INTEGER\n\nexport const LOWEST_INT32 = 1 << 31\nexport const HIGHEST_INT32 = binary.BITS31\nexport const HIGHEST_UINT32 = binary.BITS32\n\n/* c8 ignore next */\nexport const isInteger = Number.isInteger || (num => typeof num === 'number' && isFinite(num) && math.floor(num) === num)\nexport const isNaN = Number.isNaN\nexport const parseInt = Number.parseInt\n\n/**\n * Count the number of \"1\" bits in an unsigned 32bit number.\n *\n * Super fun bitcount algorithm by Brian Kernighan.\n *\n * @param {number} n\n */\nexport const countBits = n => {\n  n &= binary.BITS32\n  let count = 0\n  while (n) {\n    n &= (n - 1)\n    count++\n  }\n  return count\n}\n","/**\n * Utility functions for working with EcmaScript objects.\n *\n * @module object\n */\n\n/**\n * @return {Object<string,any>} obj\n */\nexport const create = () => Object.create(null)\n\n/**\n * Object.assign\n */\nexport const assign = Object.assign\n\n/**\n * @param {Object<string,any>} obj\n */\nexport const keys = Object.keys\n\n/**\n * @template V\n * @param {{[k:string]:V}} obj\n * @param {function(V,string):any} f\n */\nexport const forEach = (obj, f) => {\n  for (const key in obj) {\n    f(obj[key], key)\n  }\n}\n\n/**\n * @todo implement mapToArray & map\n *\n * @template R\n * @param {Object<string,any>} obj\n * @param {function(any,string):R} f\n * @return {Array<R>}\n */\nexport const map = (obj, f) => {\n  const results = []\n  for (const key in obj) {\n    results.push(f(obj[key], key))\n  }\n  return results\n}\n\n/**\n * @deprecated use object.size instead\n * @param {Object<string,any>} obj\n * @return {number}\n */\nexport const length = obj => keys(obj).length\n\n/**\n * @param {Object<string,any>} obj\n * @return {number}\n */\nexport const size = obj => keys(obj).length\n\n/**\n * @param {Object<string,any>} obj\n * @param {function(any,string):boolean} f\n * @return {boolean}\n */\nexport const some = (obj, f) => {\n  for (const key in obj) {\n    if (f(obj[key], key)) {\n      return true\n    }\n  }\n  return false\n}\n\n/**\n * @param {Object|undefined} obj\n */\nexport const isEmpty = obj => {\n  // eslint-disable-next-line\n  for (const _k in obj) {\n    return false\n  }\n  return true\n}\n\n/**\n * @param {Object<string,any>} obj\n * @param {function(any,string):boolean} f\n * @return {boolean}\n */\nexport const every = (obj, f) => {\n  for (const key in obj) {\n    if (!f(obj[key], key)) {\n      return false\n    }\n  }\n  return true\n}\n\n/**\n * Calls `Object.prototype.hasOwnProperty`.\n *\n * @param {any} obj\n * @param {string|symbol} key\n * @return {boolean}\n */\nexport const hasProperty = (obj, key) => Object.prototype.hasOwnProperty.call(obj, key)\n\n/**\n * @param {Object<string,any>} a\n * @param {Object<string,any>} b\n * @return {boolean}\n */\nexport const equalFlat = (a, b) => a === b || (size(a) === size(b) && every(a, (val, key) => (val !== undefined || hasProperty(b, key)) && b[key] === val))\n","/**\n * Observable class prototype.\n *\n * @module observable\n */\n\nimport * as map from './map.js'\nimport * as set from './set.js'\nimport * as array from './array.js'\n\n/**\n * Handles named events.\n * @experimental\n *\n * This is basically a (better typed) duplicate of Observable, which will replace Observable in the\n * next release.\n *\n * @template {{[key in keyof EVENTS]: function(...any):void}} EVENTS\n */\nexport class ObservableV2 {\n  constructor () {\n    /**\n     * Some desc.\n     * @type {Map<string, Set<any>>}\n     */\n    this._observers = map.create()\n  }\n\n  /**\n   * @template {keyof EVENTS & string} NAME\n   * @param {NAME} name\n   * @param {EVENTS[NAME]} f\n   */\n  on (name, f) {\n    map.setIfUndefined(this._observers, /** @type {string} */ (name), set.create).add(f)\n    return f\n  }\n\n  /**\n   * @template {keyof EVENTS & string} NAME\n   * @param {NAME} name\n   * @param {EVENTS[NAME]} f\n   */\n  once (name, f) {\n    /**\n     * @param  {...any} args\n     */\n    const _f = (...args) => {\n      this.off(name, /** @type {any} */ (_f))\n      f(...args)\n    }\n    this.on(name, /** @type {any} */ (_f))\n  }\n\n  /**\n   * @template {keyof EVENTS & string} NAME\n   * @param {NAME} name\n   * @param {EVENTS[NAME]} f\n   */\n  off (name, f) {\n    const observers = this._observers.get(name)\n    if (observers !== undefined) {\n      observers.delete(f)\n      if (observers.size === 0) {\n        this._observers.delete(name)\n      }\n    }\n  }\n\n  /**\n   * Emit a named event. All registered event listeners that listen to the\n   * specified name will receive the event.\n   *\n   * @todo This should catch exceptions\n   *\n   * @template {keyof EVENTS & string} NAME\n   * @param {NAME} name The event name.\n   * @param {Parameters<EVENTS[NAME]>} args The arguments that are applied to the event listener.\n   */\n  emit (name, args) {\n    // copy all listeners to an array first to make sure that no event is emitted to listeners that are subscribed while the event handler is called.\n    return array.from((this._observers.get(name) || map.create()).values()).forEach(f => f(...args))\n  }\n\n  destroy () {\n    this._observers = map.create()\n  }\n}\n\n/* c8 ignore start */\n/**\n * Handles named events.\n *\n * @deprecated\n * @template N\n */\nexport class Observable {\n  constructor () {\n    /**\n     * Some desc.\n     * @type {Map<N, any>}\n     */\n    this._observers = map.create()\n  }\n\n  /**\n   * @param {N} name\n   * @param {function} f\n   */\n  on (name, f) {\n    map.setIfUndefined(this._observers, name, set.create).add(f)\n  }\n\n  /**\n   * @param {N} name\n   * @param {function} f\n   */\n  once (name, f) {\n    /**\n     * @param  {...any} args\n     */\n    const _f = (...args) => {\n      this.off(name, _f)\n      f(...args)\n    }\n    this.on(name, _f)\n  }\n\n  /**\n   * @param {N} name\n   * @param {function} f\n   */\n  off (name, f) {\n    const observers = this._observers.get(name)\n    if (observers !== undefined) {\n      observers.delete(f)\n      if (observers.size === 0) {\n        this._observers.delete(name)\n      }\n    }\n  }\n\n  /**\n   * Emit a named event. All registered event listeners that listen to the\n   * specified name will receive the event.\n   *\n   * @todo This should catch exceptions\n   *\n   * @param {N} name The event name.\n   * @param {Array<any>} args The arguments that are applied to the event listener.\n   */\n  emit (name, args) {\n    // copy all listeners to an array first to make sure that no event is emitted to listeners that are subscribed while the event handler is called.\n    return array.from((this._observers.get(name) || map.create()).values()).forEach(f => f(...args))\n  }\n\n  destroy () {\n    this._observers = map.create()\n  }\n}\n/* c8 ignore end */\n","/**\n * Utility helpers to work with promises.\n *\n * @module promise\n */\n\nimport * as time from './time.js'\n\n/**\n * @template T\n * @callback PromiseResolve\n * @param {T|PromiseLike<T>} [result]\n */\n\n/**\n * @template T\n * @param {function(PromiseResolve<T>,function(Error):void):any} f\n * @return {Promise<T>}\n */\nexport const create = f => /** @type {Promise<T>} */ (new Promise(f))\n\n/**\n * @param {function(function():void,function(Error):void):void} f\n * @return {Promise<void>}\n */\nexport const createEmpty = f => new Promise(f)\n\n/**\n * `Promise.all` wait for all promises in the array to resolve and return the result\n * @template {unknown[] | []} PS\n *\n * @param {PS} ps\n * @return {Promise<{ -readonly [P in keyof PS]: Awaited<PS[P]> }>}\n */\nexport const all = Promise.all.bind(Promise)\n\n/**\n * @param {Error} [reason]\n * @return {Promise<never>}\n */\nexport const reject = reason => Promise.reject(reason)\n\n/**\n * @template T\n * @param {T|void} res\n * @return {Promise<T|void>}\n */\nexport const resolve = res => Promise.resolve(res)\n\n/**\n * @template T\n * @param {T} res\n * @return {Promise<T>}\n */\nexport const resolveWith = res => Promise.resolve(res)\n\n/**\n * @todo Next version, reorder parameters: check, [timeout, [intervalResolution]]\n * @deprecated use untilAsync instead\n *\n * @param {number} timeout\n * @param {function():boolean} check\n * @param {number} [intervalResolution]\n * @return {Promise<void>}\n */\nexport const until = (timeout, check, intervalResolution = 10) => create((resolve, reject) => {\n  const startTime = time.getUnixTime()\n  const hasTimeout = timeout > 0\n  const untilInterval = () => {\n    if (check()) {\n      clearInterval(intervalHandle)\n      resolve()\n    } else if (hasTimeout) {\n      /* c8 ignore else */\n      if (time.getUnixTime() - startTime > timeout) {\n        clearInterval(intervalHandle)\n        reject(new Error('Timeout'))\n      }\n    }\n  }\n  const intervalHandle = setInterval(untilInterval, intervalResolution)\n})\n\n/**\n * @param {()=>Promise<boolean>|boolean} check\n * @param {number} timeout\n * @param {number} intervalResolution\n * @return {Promise<void>}\n */\nexport const untilAsync = async (check, timeout = 0, intervalResolution = 10) => {\n  const startTime = time.getUnixTime()\n  const noTimeout = timeout <= 0\n  // eslint-disable-next-line no-unmodified-loop-condition\n  while (noTimeout || time.getUnixTime() - startTime <= timeout) {\n    if (await check()) return\n    await wait(intervalResolution)\n  }\n  throw new Error('Timeout')\n}\n\n/**\n * @param {number} timeout\n * @return {Promise<undefined>}\n */\nexport const wait = timeout => create((resolve, _reject) => setTimeout(resolve, timeout))\n\n/**\n * Checks if an object is a promise using ducktyping.\n *\n * Promises are often polyfilled, so it makes sense to add some additional guarantees if the user of this\n * library has some insane environment where global Promise objects are overwritten.\n *\n * @param {any} p\n * @return {boolean}\n */\nexport const isPromise = p => p instanceof Promise || (p && p.then && p.catch && p.finally)\n","/* eslint-env browser */\n\nexport const subtle = crypto.subtle\nexport const getRandomValues = crypto.getRandomValues.bind(crypto)\n","/**\n * Isomorphic module for true random numbers / buffers / uuids.\n *\n * Attention: falls back to Math.random if the browser does not support crypto.\n *\n * @module random\n */\n\nimport * as math from './math.js'\nimport * as binary from './binary.js'\nimport { getRandomValues } from 'lib0/webcrypto'\n\nexport const rand = Math.random\n\nexport const uint32 = () => getRandomValues(new Uint32Array(1))[0]\n\nexport const uint53 = () => {\n  const arr = getRandomValues(new Uint32Array(8))\n  return (arr[0] & binary.BITS21) * (binary.BITS32 + 1) + (arr[1] >>> 0)\n}\n\n/**\n * @template T\n * @param {Array<T>} arr\n * @return {T}\n */\nexport const oneOf = arr => arr[math.floor(rand() * arr.length)]\n\n// @ts-ignore\nconst uuidv4Template = [1e7] + -1e3 + -4e3 + -8e3 + -1e11\n\n/**\n * @return {string}\n */\nexport const uuidv4 = () => uuidv4Template.replace(/[018]/g, /** @param {number} c */ c =>\n  (c ^ uint32() & 15 >> c / 4).toString(16)\n)\n","/**\n * Utility module to work with sets.\n *\n * @module set\n */\n\nexport const create = () => new Set()\n\n/**\n * @template T\n * @param {Set<T>} set\n * @return {Array<T>}\n */\nexport const toArray = set => Array.from(set)\n\n/**\n * @template T\n * @param {Set<T>} set\n * @return {T}\n */\nexport const first = set =>\n  set.values().next().value || undefined\n\n/**\n * @template T\n * @param {Iterable<T>} entries\n * @return {Set<T>}\n */\nexport const from = entries => new Set(entries)\n","import * as array from './array.js'\n\n/**\n * Utility module to work with strings.\n *\n * @module string\n */\n\nexport const fromCharCode = String.fromCharCode\nexport const fromCodePoint = String.fromCodePoint\n\n/**\n * The largest utf16 character.\n * Corresponds to Uint8Array([255, 255]) or charcodeof(2x2^8)\n */\nexport const MAX_UTF16_CHARACTER = fromCharCode(65535)\n\n/**\n * @param {string} s\n * @return {string}\n */\nconst toLowerCase = s => s.toLowerCase()\n\nconst trimLeftRegex = /^\\s*/g\n\n/**\n * @param {string} s\n * @return {string}\n */\nexport const trimLeft = s => s.replace(trimLeftRegex, '')\n\nconst fromCamelCaseRegex = /([A-Z])/g\n\n/**\n * @param {string} s\n * @param {string} separator\n * @return {string}\n */\nexport const fromCamelCase = (s, separator) => trimLeft(s.replace(fromCamelCaseRegex, match => `${separator}${toLowerCase(match)}`))\n\n/**\n * Compute the utf8ByteLength\n * @param {string} str\n * @return {number}\n */\nexport const utf8ByteLength = str => unescape(encodeURIComponent(str)).length\n\n/**\n * @param {string} str\n * @return {Uint8Array}\n */\nexport const _encodeUtf8Polyfill = str => {\n  const encodedString = unescape(encodeURIComponent(str))\n  const len = encodedString.length\n  const buf = new Uint8Array(len)\n  for (let i = 0; i < len; i++) {\n    buf[i] = /** @type {number} */ (encodedString.codePointAt(i))\n  }\n  return buf\n}\n\n/* c8 ignore next */\nexport const utf8TextEncoder = /** @type {TextEncoder} */ (typeof TextEncoder !== 'undefined' ? new TextEncoder() : null)\n\n/**\n * @param {string} str\n * @return {Uint8Array}\n */\nexport const _encodeUtf8Native = str => utf8TextEncoder.encode(str)\n\n/**\n * @param {string} str\n * @return {Uint8Array}\n */\n/* c8 ignore next */\nexport const encodeUtf8 = utf8TextEncoder ? _encodeUtf8Native : _encodeUtf8Polyfill\n\n/**\n * @param {Uint8Array} buf\n * @return {string}\n */\nexport const _decodeUtf8Polyfill = buf => {\n  let remainingLen = buf.length\n  let encodedString = ''\n  let bufPos = 0\n  while (remainingLen > 0) {\n    const nextLen = remainingLen < 10000 ? remainingLen : 10000\n    const bytes = buf.subarray(bufPos, bufPos + nextLen)\n    bufPos += nextLen\n    // Starting with ES5.1 we can supply a generic array-like object as arguments\n    encodedString += String.fromCodePoint.apply(null, /** @type {any} */ (bytes))\n    remainingLen -= nextLen\n  }\n  return decodeURIComponent(escape(encodedString))\n}\n\n/* c8 ignore next */\nexport let utf8TextDecoder = typeof TextDecoder === 'undefined' ? null : new TextDecoder('utf-8', { fatal: true, ignoreBOM: true })\n\n/* c8 ignore start */\nif (utf8TextDecoder && utf8TextDecoder.decode(new Uint8Array()).length === 1) {\n  // Safari doesn't handle BOM correctly.\n  // This fixes a bug in Safari 13.0.5 where it produces a BOM the first time it is called.\n  // utf8TextDecoder.decode(new Uint8Array()).length === 1 on the first call and\n  // utf8TextDecoder.decode(new Uint8Array()).length === 1 on the second call\n  // Another issue is that from then on no BOM chars are recognized anymore\n  /* c8 ignore next */\n  utf8TextDecoder = null\n}\n/* c8 ignore stop */\n\n/**\n * @param {Uint8Array} buf\n * @return {string}\n */\nexport const _decodeUtf8Native = buf => /** @type {TextDecoder} */ (utf8TextDecoder).decode(buf)\n\n/**\n * @param {Uint8Array} buf\n * @return {string}\n */\n/* c8 ignore next */\nexport const decodeUtf8 = utf8TextDecoder ? _decodeUtf8Native : _decodeUtf8Polyfill\n\n/**\n * @param {string} str The initial string\n * @param {number} index Starting position\n * @param {number} remove Number of characters to remove\n * @param {string} insert New content to insert\n */\nexport const splice = (str, index, remove, insert = '') => str.slice(0, index) + insert + str.slice(index + remove)\n\n/**\n * @param {string} source\n * @param {number} n\n */\nexport const repeat = (source, n) => array.unfold(n, () => source).join('')\n","/**\n * Utility module to work with time.\n *\n * @module time\n */\n\nimport * as metric from './metric.js'\nimport * as math from './math.js'\n\n/**\n * Return current time.\n *\n * @return {Date}\n */\nexport const getDate = () => new Date()\n\n/**\n * Return current unix time.\n *\n * @return {number}\n */\nexport const getUnixTime = Date.now\n\n/**\n * Transform time (in ms) to a human readable format. E.g. 1100 => 1.1s. 60s => 1min. .001 => 10μs.\n *\n * @param {number} d duration in milliseconds\n * @return {string} humanized approximation of time\n */\nexport const humanizeDuration = d => {\n  if (d < 60000) {\n    const p = metric.prefix(d, -1)\n    return math.round(p.n * 100) / 100 + p.prefix + 's'\n  }\n  d = math.floor(d / 1000)\n  const seconds = d % 60\n  const minutes = math.floor(d / 60) % 60\n  const hours = math.floor(d / 3600) % 24\n  const days = math.floor(d / 86400)\n  if (days > 0) {\n    return days + 'd' + ((hours > 0 || minutes > 30) ? ' ' + (minutes > 30 ? hours + 1 : hours) + 'h' : '')\n  }\n  if (hours > 0) {\n    /* c8 ignore next */\n    return hours + 'h' + ((minutes > 0 || seconds > 30) ? ' ' + (seconds > 30 ? minutes + 1 : minutes) + 'min' : '')\n  }\n  return minutes + 'min' + (seconds > 0 ? ' ' + seconds + 's' : '')\n}\n","import eq from './eq.js';\n\n/**\n * Gets the index at which the `key` is found in `array` of key-value pairs.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {*} key The key to search for.\n * @returns {number} Returns the index of the matched value, else `-1`.\n */\nfunction assocIndexOf(array, key) {\n  var length = array.length;\n  while (length--) {\n    if (eq(array[length][0], key)) {\n      return length;\n    }\n  }\n  return -1;\n}\n\nexport default assocIndexOf;\n","import assocIndexOf from './_assocIndexOf.js';\n\n/** Used for built-in method references. */\nvar arrayProto = Array.prototype;\n\n/** Built-in value references. */\nvar splice = arrayProto.splice;\n\n/**\n * Removes `key` and its value from the list cache.\n *\n * @private\n * @name delete\n * @memberOf ListCache\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\nfunction listCacheDelete(key) {\n  var data = this.__data__,\n      index = assocIndexOf(data, key);\n\n  if (index < 0) {\n    return false;\n  }\n  var lastIndex = data.length - 1;\n  if (index == lastIndex) {\n    data.pop();\n  } else {\n    splice.call(data, index, 1);\n  }\n  --this.size;\n  return true;\n}\n\nexport default listCacheDelete;\n","import listCacheClear from './_listCacheClear.js';\nimport listCacheDelete from './_listCacheDelete.js';\nimport listCacheGet from './_listCacheGet.js';\nimport listCacheHas from './_listCacheHas.js';\nimport listCacheSet from './_listCacheSet.js';\n\n/**\n * Creates an list cache object.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\nfunction ListCache(entries) {\n  var index = -1,\n      length = entries == null ? 0 : entries.length;\n\n  this.clear();\n  while (++index < length) {\n    var entry = entries[index];\n    this.set(entry[0], entry[1]);\n  }\n}\n\n// Add methods to `ListCache`.\nListCache.prototype.clear = listCacheClear;\nListCache.prototype['delete'] = listCacheDelete;\nListCache.prototype.get = listCacheGet;\nListCache.prototype.has = listCacheHas;\nListCache.prototype.set = listCacheSet;\n\nexport default ListCache;\n","/**\n * Removes all key-value entries from the list cache.\n *\n * @private\n * @name clear\n * @memberOf ListCache\n */\nfunction listCacheClear() {\n  this.__data__ = [];\n  this.size = 0;\n}\n\nexport default listCacheClear;\n","import assocIndexOf from './_assocIndexOf.js';\n\n/**\n * Gets the list cache value for `key`.\n *\n * @private\n * @name get\n * @memberOf ListCache\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\nfunction listCacheGet(key) {\n  var data = this.__data__,\n      index = assocIndexOf(data, key);\n\n  return index < 0 ? undefined : data[index][1];\n}\n\nexport default listCacheGet;\n","import assocIndexOf from './_assocIndexOf.js';\n\n/**\n * Checks if a list cache value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf ListCache\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction listCacheHas(key) {\n  return assocIndexOf(this.__data__, key) > -1;\n}\n\nexport default listCacheHas;\n","import assocIndexOf from './_assocIndexOf.js';\n\n/**\n * Sets the list cache `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf ListCache\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the list cache instance.\n */\nfunction listCacheSet(key, value) {\n  var data = this.__data__,\n      index = assocIndexOf(data, key);\n\n  if (index < 0) {\n    ++this.size;\n    data.push([key, value]);\n  } else {\n    data[index][1] = value;\n  }\n  return this;\n}\n\nexport default listCacheSet;\n","import getNative from './_getNative.js';\nimport root from './_root.js';\n\n/* Built-in method references that are verified to be native. */\nvar Map = getNative(root, 'Map');\n\nexport default Map;\n","import getNative from './_getNative.js';\n\n/* Built-in method references that are verified to be native. */\nvar nativeCreate = getNative(Object, 'create');\n\nexport default nativeCreate;\n","import nativeCreate from './_nativeCreate.js';\n\n/** Used to stand-in for `undefined` hash values. */\nvar HASH_UNDEFINED = '__lodash_hash_undefined__';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Gets the hash value for `key`.\n *\n * @private\n * @name get\n * @memberOf Hash\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\nfunction hashGet(key) {\n  var data = this.__data__;\n  if (nativeCreate) {\n    var result = data[key];\n    return result === HASH_UNDEFINED ? undefined : result;\n  }\n  return hasOwnProperty.call(data, key) ? data[key] : undefined;\n}\n\nexport default hashGet;\n","import nativeCreate from './_nativeCreate.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Checks if a hash value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf Hash\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction hashHas(key) {\n  var data = this.__data__;\n  return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key);\n}\n\nexport default hashHas;\n","import hashClear from './_hashClear.js';\nimport hashDelete from './_hashDelete.js';\nimport hashGet from './_hashGet.js';\nimport hashHas from './_hashHas.js';\nimport hashSet from './_hashSet.js';\n\n/**\n * Creates a hash object.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\nfunction Hash(entries) {\n  var index = -1,\n      length = entries == null ? 0 : entries.length;\n\n  this.clear();\n  while (++index < length) {\n    var entry = entries[index];\n    this.set(entry[0], entry[1]);\n  }\n}\n\n// Add methods to `Hash`.\nHash.prototype.clear = hashClear;\nHash.prototype['delete'] = hashDelete;\nHash.prototype.get = hashGet;\nHash.prototype.has = hashHas;\nHash.prototype.set = hashSet;\n\nexport default Hash;\n","import nativeCreate from './_nativeCreate.js';\n\n/**\n * Removes all key-value entries from the hash.\n *\n * @private\n * @name clear\n * @memberOf Hash\n */\nfunction hashClear() {\n  this.__data__ = nativeCreate ? nativeCreate(null) : {};\n  this.size = 0;\n}\n\nexport default hashClear;\n","/**\n * Removes `key` and its value from the hash.\n *\n * @private\n * @name delete\n * @memberOf Hash\n * @param {Object} hash The hash to modify.\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\nfunction hashDelete(key) {\n  var result = this.has(key) && delete this.__data__[key];\n  this.size -= result ? 1 : 0;\n  return result;\n}\n\nexport default hashDelete;\n","import nativeCreate from './_nativeCreate.js';\n\n/** Used to stand-in for `undefined` hash values. */\nvar HASH_UNDEFINED = '__lodash_hash_undefined__';\n\n/**\n * Sets the hash `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf Hash\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the hash instance.\n */\nfunction hashSet(key, value) {\n  var data = this.__data__;\n  this.size += this.has(key) ? 0 : 1;\n  data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;\n  return this;\n}\n\nexport default hashSet;\n","/**\n * Checks if `value` is suitable for use as unique object key.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is suitable, else `false`.\n */\nfunction isKeyable(value) {\n  var type = typeof value;\n  return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')\n    ? (value !== '__proto__')\n    : (value === null);\n}\n\nexport default isKeyable;\n","import isKeyable from './_isKeyable.js';\n\n/**\n * Gets the data for `map`.\n *\n * @private\n * @param {Object} map The map to query.\n * @param {string} key The reference key.\n * @returns {*} Returns the map data.\n */\nfunction getMapData(map, key) {\n  var data = map.__data__;\n  return isKeyable(key)\n    ? data[typeof key == 'string' ? 'string' : 'hash']\n    : data.map;\n}\n\nexport default getMapData;\n","import mapCacheClear from './_mapCacheClear.js';\nimport mapCacheDelete from './_mapCacheDelete.js';\nimport mapCacheGet from './_mapCacheGet.js';\nimport mapCacheHas from './_mapCacheHas.js';\nimport mapCacheSet from './_mapCacheSet.js';\n\n/**\n * Creates a map cache object to store key-value pairs.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\nfunction MapCache(entries) {\n  var index = -1,\n      length = entries == null ? 0 : entries.length;\n\n  this.clear();\n  while (++index < length) {\n    var entry = entries[index];\n    this.set(entry[0], entry[1]);\n  }\n}\n\n// Add methods to `MapCache`.\nMapCache.prototype.clear = mapCacheClear;\nMapCache.prototype['delete'] = mapCacheDelete;\nMapCache.prototype.get = mapCacheGet;\nMapCache.prototype.has = mapCacheHas;\nMapCache.prototype.set = mapCacheSet;\n\nexport default MapCache;\n","import Hash from './_Hash.js';\nimport ListCache from './_ListCache.js';\nimport Map from './_Map.js';\n\n/**\n * Removes all key-value entries from the map.\n *\n * @private\n * @name clear\n * @memberOf MapCache\n */\nfunction mapCacheClear() {\n  this.size = 0;\n  this.__data__ = {\n    'hash': new Hash,\n    'map': new (Map || ListCache),\n    'string': new Hash\n  };\n}\n\nexport default mapCacheClear;\n","import getMapData from './_getMapData.js';\n\n/**\n * Removes `key` and its value from the map.\n *\n * @private\n * @name delete\n * @memberOf MapCache\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\nfunction mapCacheDelete(key) {\n  var result = getMapData(this, key)['delete'](key);\n  this.size -= result ? 1 : 0;\n  return result;\n}\n\nexport default mapCacheDelete;\n","import getMapData from './_getMapData.js';\n\n/**\n * Gets the map value for `key`.\n *\n * @private\n * @name get\n * @memberOf MapCache\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\nfunction mapCacheGet(key) {\n  return getMapData(this, key).get(key);\n}\n\nexport default mapCacheGet;\n","import getMapData from './_getMapData.js';\n\n/**\n * Checks if a map value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf MapCache\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction mapCacheHas(key) {\n  return getMapData(this, key).has(key);\n}\n\nexport default mapCacheHas;\n","import getMapData from './_getMapData.js';\n\n/**\n * Sets the map `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf MapCache\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the map cache instance.\n */\nfunction mapCacheSet(key, value) {\n  var data = getMapData(this, key),\n      size = data.size;\n\n  data.set(key, value);\n  this.size += data.size == size ? 0 : 1;\n  return this;\n}\n\nexport default mapCacheSet;\n","import MapCache from './_MapCache.js';\nimport setCacheAdd from './_setCacheAdd.js';\nimport setCacheHas from './_setCacheHas.js';\n\n/**\n *\n * Creates an array cache object to store unique values.\n *\n * @private\n * @constructor\n * @param {Array} [values] The values to cache.\n */\nfunction SetCache(values) {\n  var index = -1,\n      length = values == null ? 0 : values.length;\n\n  this.__data__ = new MapCache;\n  while (++index < length) {\n    this.add(values[index]);\n  }\n}\n\n// Add methods to `SetCache`.\nSetCache.prototype.add = SetCache.prototype.push = setCacheAdd;\nSetCache.prototype.has = setCacheHas;\n\nexport default SetCache;\n","/** Used to stand-in for `undefined` hash values. */\nvar HASH_UNDEFINED = '__lodash_hash_undefined__';\n\n/**\n * Adds `value` to the array cache.\n *\n * @private\n * @name add\n * @memberOf SetCache\n * @alias push\n * @param {*} value The value to cache.\n * @returns {Object} Returns the cache instance.\n */\nfunction setCacheAdd(value) {\n  this.__data__.set(value, HASH_UNDEFINED);\n  return this;\n}\n\nexport default setCacheAdd;\n","/**\n * Checks if `value` is in the array cache.\n *\n * @private\n * @name has\n * @memberOf SetCache\n * @param {*} value The value to search for.\n * @returns {number} Returns `true` if `value` is found, else `false`.\n */\nfunction setCacheHas(value) {\n  return this.__data__.has(value);\n}\n\nexport default setCacheHas;\n","import root from './_root.js';\n\n/** Built-in value references. */\nvar Symbol = root.Symbol;\n\nexport default Symbol;\n","/**\n * A faster alternative to `Function#apply`, this function invokes `func`\n * with the `this` binding of `thisArg` and the arguments of `args`.\n *\n * @private\n * @param {Function} func The function to invoke.\n * @param {*} thisArg The `this` binding of `func`.\n * @param {Array} args The arguments to invoke `func` with.\n * @returns {*} Returns the result of `func`.\n */\nfunction apply(func, thisArg, args) {\n  switch (args.length) {\n    case 0: return func.call(thisArg);\n    case 1: return func.call(thisArg, args[0]);\n    case 2: return func.call(thisArg, args[0], args[1]);\n    case 3: return func.call(thisArg, args[0], args[1], args[2]);\n  }\n  return func.apply(thisArg, args);\n}\n\nexport default apply;\n","/**\n * A specialized version of `_.map` for arrays without support for iteratee\n * shorthands.\n *\n * @private\n * @param {Array} [array] The array to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {Array} Returns the new mapped array.\n */\nfunction arrayMap(array, iteratee) {\n  var index = -1,\n      length = array == null ? 0 : array.length,\n      result = Array(length);\n\n  while (++index < length) {\n    result[index] = iteratee(array[index], index, array);\n  }\n  return result;\n}\n\nexport default arrayMap;\n","/**\n * Appends the elements of `values` to `array`.\n *\n * @private\n * @param {Array} array The array to modify.\n * @param {Array} values The values to append.\n * @returns {Array} Returns `array`.\n */\nfunction arrayPush(array, values) {\n  var index = -1,\n      length = values.length,\n      offset = array.length;\n\n  while (++index < length) {\n    array[offset + index] = values[index];\n  }\n  return array;\n}\n\nexport default arrayPush;\n","import Symbol from './_Symbol.js';\nimport isArguments from './isArguments.js';\nimport isArray from './isArray.js';\n\n/** Built-in value references. */\nvar spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined;\n\n/**\n * Checks if `value` is a flattenable `arguments` object or array.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.\n */\nfunction isFlattenable(value) {\n  return isArray(value) || isArguments(value) ||\n    !!(spreadableSymbol && value && value[spreadableSymbol]);\n}\n\nexport default isFlattenable;\n","import arrayPush from './_arrayPush.js';\nimport isFlattenable from './_isFlattenable.js';\n\n/**\n * The base implementation of `_.flatten` with support for restricting flattening.\n *\n * @private\n * @param {Array} array The array to flatten.\n * @param {number} depth The maximum recursion depth.\n * @param {boolean} [predicate=isFlattenable] The function invoked per iteration.\n * @param {boolean} [isStrict] Restrict to values that pass `predicate` checks.\n * @param {Array} [result=[]] The initial result value.\n * @returns {Array} Returns the new flattened array.\n */\nfunction baseFlatten(array, depth, predicate, isStrict, result) {\n  var index = -1,\n      length = array.length;\n\n  predicate || (predicate = isFlattenable);\n  result || (result = []);\n\n  while (++index < length) {\n    var value = array[index];\n    if (depth > 0 && predicate(value)) {\n      if (depth > 1) {\n        // Recursively flatten arrays (susceptible to call stack limits).\n        baseFlatten(value, depth - 1, predicate, isStrict, result);\n      } else {\n        arrayPush(result, value);\n      }\n    } else if (!isStrict) {\n      result[result.length] = value;\n    }\n  }\n  return result;\n}\n\nexport default baseFlatten;\n","import Symbol from './_Symbol.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Used to resolve the\n * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)\n * of values.\n */\nvar nativeObjectToString = objectProto.toString;\n\n/** Built-in value references. */\nvar symToStringTag = Symbol ? Symbol.toStringTag : undefined;\n\n/**\n * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.\n *\n * @private\n * @param {*} value The value to query.\n * @returns {string} Returns the raw `toStringTag`.\n */\nfunction getRawTag(value) {\n  var isOwn = hasOwnProperty.call(value, symToStringTag),\n      tag = value[symToStringTag];\n\n  try {\n    value[symToStringTag] = undefined;\n    var unmasked = true;\n  } catch (e) {}\n\n  var result = nativeObjectToString.call(value);\n  if (unmasked) {\n    if (isOwn) {\n      value[symToStringTag] = tag;\n    } else {\n      delete value[symToStringTag];\n    }\n  }\n  return result;\n}\n\nexport default getRawTag;\n","/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/**\n * Used to resolve the\n * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)\n * of values.\n */\nvar nativeObjectToString = objectProto.toString;\n\n/**\n * Converts `value` to a string using `Object.prototype.toString`.\n *\n * @private\n * @param {*} value The value to convert.\n * @returns {string} Returns the converted string.\n */\nfunction objectToString(value) {\n  return nativeObjectToString.call(value);\n}\n\nexport default objectToString;\n","import Symbol from './_Symbol.js';\nimport getRawTag from './_getRawTag.js';\nimport objectToString from './_objectToString.js';\n\n/** `Object#toString` result references. */\nvar nullTag = '[object Null]',\n    undefinedTag = '[object Undefined]';\n\n/** Built-in value references. */\nvar symToStringTag = Symbol ? Symbol.toStringTag : undefined;\n\n/**\n * The base implementation of `getTag` without fallbacks for buggy environments.\n *\n * @private\n * @param {*} value The value to query.\n * @returns {string} Returns the `toStringTag`.\n */\nfunction baseGetTag(value) {\n  if (value == null) {\n    return value === undefined ? undefinedTag : nullTag;\n  }\n  return (symToStringTag && symToStringTag in Object(value))\n    ? getRawTag(value)\n    : objectToString(value);\n}\n\nexport default baseGetTag;\n","import identity from './identity.js';\nimport overRest from './_overRest.js';\nimport setToString from './_setToString.js';\n\n/**\n * The base implementation of `_.rest` which doesn't validate or coerce arguments.\n *\n * @private\n * @param {Function} func The function to apply a rest parameter to.\n * @param {number} [start=func.length-1] The start position of the rest parameter.\n * @returns {Function} Returns the new function.\n */\nfunction baseRest(func, start) {\n  return setToString(overRest(func, start, identity), func + '');\n}\n\nexport default baseRest;\n","/**\n * The base implementation of `_.unary` without support for storing metadata.\n *\n * @private\n * @param {Function} func The function to cap arguments for.\n * @returns {Function} Returns the new capped function.\n */\nfunction baseUnary(func) {\n  return function(value) {\n    return func(value);\n  };\n}\n\nexport default baseUnary;\n","/**\n * Checks if a `cache` value for `key` exists.\n *\n * @private\n * @param {Object} cache The cache to query.\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction cacheHas(cache, key) {\n  return cache.has(key);\n}\n\nexport default cacheHas;\n","import getNative from './_getNative.js';\n\nvar defineProperty = (function() {\n  try {\n    var func = getNative(Object, 'defineProperty');\n    func({}, '', {});\n    return func;\n  } catch (e) {}\n}());\n\nexport default defineProperty;\n","/** Detect free variable `global` from Node.js. */\nvar freeGlobal = typeof global == 'object' && global && global.Object === Object && global;\n\nexport default freeGlobal;\n","import root from './_root.js';\n\n/** Used to detect overreaching core-js shims. */\nvar coreJsData = root['__core-js_shared__'];\n\nexport default coreJsData;\n","import coreJsData from './_coreJsData.js';\n\n/** Used to detect methods masquerading as native. */\nvar maskSrcKey = (function() {\n  var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');\n  return uid ? ('Symbol(src)_1.' + uid) : '';\n}());\n\n/**\n * Checks if `func` has its source masked.\n *\n * @private\n * @param {Function} func The function to check.\n * @returns {boolean} Returns `true` if `func` is masked, else `false`.\n */\nfunction isMasked(func) {\n  return !!maskSrcKey && (maskSrcKey in func);\n}\n\nexport default isMasked;\n","import isFunction from './isFunction.js';\nimport isMasked from './_isMasked.js';\nimport isObject from './isObject.js';\nimport toSource from './_toSource.js';\n\n/**\n * Used to match `RegExp`\n * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).\n */\nvar reRegExpChar = /[\\\\^$.*+?()[\\]{}|]/g;\n\n/** Used to detect host constructors (Safari). */\nvar reIsHostCtor = /^\\[object .+?Constructor\\]$/;\n\n/** Used for built-in method references. */\nvar funcProto = Function.prototype,\n    objectProto = Object.prototype;\n\n/** Used to resolve the decompiled source of functions. */\nvar funcToString = funcProto.toString;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/** Used to detect if a method is native. */\nvar reIsNative = RegExp('^' +\n  funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\\\$&')\n  .replace(/hasOwnProperty|(function).*?(?=\\\\\\()| for .+?(?=\\\\\\])/g, '$1.*?') + '$'\n);\n\n/**\n * The base implementation of `_.isNative` without bad shim checks.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a native function,\n *  else `false`.\n */\nfunction baseIsNative(value) {\n  if (!isObject(value) || isMasked(value)) {\n    return false;\n  }\n  var pattern = isFunction(value) ? reIsNative : reIsHostCtor;\n  return pattern.test(toSource(value));\n}\n\nexport default baseIsNative;\n","import baseIsNative from './_baseIsNative.js';\nimport getValue from './_getValue.js';\n\n/**\n * Gets the native function at `key` of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {string} key The key of the method to get.\n * @returns {*} Returns the function if it's native, else `undefined`.\n */\nfunction getNative(object, key) {\n  var value = getValue(object, key);\n  return baseIsNative(value) ? value : undefined;\n}\n\nexport default getNative;\n","/**\n * Gets the value at `key` of `object`.\n *\n * @private\n * @param {Object} [object] The object to query.\n * @param {string} key The key of the property to get.\n * @returns {*} Returns the property value.\n */\nfunction getValue(object, key) {\n  return object == null ? undefined : object[key];\n}\n\nexport default getValue;\n","import apply from './_apply.js';\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeMax = Math.max;\n\n/**\n * A specialized version of `baseRest` which transforms the rest array.\n *\n * @private\n * @param {Function} func The function to apply a rest parameter to.\n * @param {number} [start=func.length-1] The start position of the rest parameter.\n * @param {Function} transform The rest array transform.\n * @returns {Function} Returns the new function.\n */\nfunction overRest(func, start, transform) {\n  start = nativeMax(start === undefined ? (func.length - 1) : start, 0);\n  return function() {\n    var args = arguments,\n        index = -1,\n        length = nativeMax(args.length - start, 0),\n        array = Array(length);\n\n    while (++index < length) {\n      array[index] = args[start + index];\n    }\n    index = -1;\n    var otherArgs = Array(start + 1);\n    while (++index < start) {\n      otherArgs[index] = args[index];\n    }\n    otherArgs[start] = transform(array);\n    return apply(func, this, otherArgs);\n  };\n}\n\nexport default overRest;\n","import freeGlobal from './_freeGlobal.js';\n\n/** Detect free variable `self`. */\nvar freeSelf = typeof self == 'object' && self && self.Object === Object && self;\n\n/** Used as a reference to the global object. */\nvar root = freeGlobal || freeSelf || Function('return this')();\n\nexport default root;\n","import constant from './constant.js';\nimport defineProperty from './_defineProperty.js';\nimport identity from './identity.js';\n\n/**\n * The base implementation of `setToString` without support for hot loop shorting.\n *\n * @private\n * @param {Function} func The function to modify.\n * @param {Function} string The `toString` result.\n * @returns {Function} Returns `func`.\n */\nvar baseSetToString = !defineProperty ? identity : function(func, string) {\n  return defineProperty(func, 'toString', {\n    'configurable': true,\n    'enumerable': false,\n    'value': constant(string),\n    'writable': true\n  });\n};\n\nexport default baseSetToString;\n","/**\n * Creates a function that returns `value`.\n *\n * @static\n * @memberOf _\n * @since 2.4.0\n * @category Util\n * @param {*} value The value to return from the new function.\n * @returns {Function} Returns the new constant function.\n * @example\n *\n * var objects = _.times(2, _.constant({ 'a': 1 }));\n *\n * console.log(objects);\n * // => [{ 'a': 1 }, { 'a': 1 }]\n *\n * console.log(objects[0] === objects[1]);\n * // => true\n */\nfunction constant(value) {\n  return function() {\n    return value;\n  };\n}\n\nexport default constant;\n","/** Used to detect hot functions by number of calls within a span of milliseconds. */\nvar HOT_COUNT = 800,\n    HOT_SPAN = 16;\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeNow = Date.now;\n\n/**\n * Creates a function that'll short out and invoke `identity` instead\n * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`\n * milliseconds.\n *\n * @private\n * @param {Function} func The function to restrict.\n * @returns {Function} Returns the new shortable function.\n */\nfunction shortOut(func) {\n  var count = 0,\n      lastCalled = 0;\n\n  return function() {\n    var stamp = nativeNow(),\n        remaining = HOT_SPAN - (stamp - lastCalled);\n\n    lastCalled = stamp;\n    if (remaining > 0) {\n      if (++count >= HOT_COUNT) {\n        return arguments[0];\n      }\n    } else {\n      count = 0;\n    }\n    return func.apply(undefined, arguments);\n  };\n}\n\nexport default shortOut;\n","import baseSetToString from './_baseSetToString.js';\nimport shortOut from './_shortOut.js';\n\n/**\n * Sets the `toString` method of `func` to return `string`.\n *\n * @private\n * @param {Function} func The function to modify.\n * @param {Function} string The `toString` result.\n * @returns {Function} Returns `func`.\n */\nvar setToString = shortOut(baseSetToString);\n\nexport default setToString;\n","/** Used for built-in method references. */\nvar funcProto = Function.prototype;\n\n/** Used to resolve the decompiled source of functions. */\nvar funcToString = funcProto.toString;\n\n/**\n * Converts `func` to its source code.\n *\n * @private\n * @param {Function} func The function to convert.\n * @returns {string} Returns the source code.\n */\nfunction toSource(func) {\n  if (func != null) {\n    try {\n      return funcToString.call(func);\n    } catch (e) {}\n    try {\n      return (func + '');\n    } catch (e) {}\n  }\n  return '';\n}\n\nexport default toSource;\n","/**\n * The base implementation of `_.findIndex` and `_.findLastIndex` without\n * support for iteratee shorthands.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {Function} predicate The function invoked per iteration.\n * @param {number} fromIndex The index to search from.\n * @param {boolean} [fromRight] Specify iterating from right to left.\n * @returns {number} Returns the index of the matched value, else `-1`.\n */\nfunction baseFindIndex(array, predicate, fromIndex, fromRight) {\n  var length = array.length,\n      index = fromIndex + (fromRight ? 1 : -1);\n\n  while ((fromRight ? index-- : ++index < length)) {\n    if (predicate(array[index], index, array)) {\n      return index;\n    }\n  }\n  return -1;\n}\n\nexport default baseFindIndex;\n","/**\n * The base implementation of `_.isNaN` without support for number objects.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.\n */\nfunction baseIsNaN(value) {\n  return value !== value;\n}\n\nexport default baseIsNaN;\n","/**\n * A specialized version of `_.indexOf` which performs strict equality\n * comparisons of values, i.e. `===`.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {*} value The value to search for.\n * @param {number} fromIndex The index to search from.\n * @returns {number} Returns the index of the matched value, else `-1`.\n */\nfunction strictIndexOf(array, value, fromIndex) {\n  var index = fromIndex - 1,\n      length = array.length;\n\n  while (++index < length) {\n    if (array[index] === value) {\n      return index;\n    }\n  }\n  return -1;\n}\n\nexport default strictIndexOf;\n","import baseIndexOf from './_baseIndexOf.js';\n\n/**\n * A specialized version of `_.includes` for arrays without support for\n * specifying an index to search from.\n *\n * @private\n * @param {Array} [array] The array to inspect.\n * @param {*} target The value to search for.\n * @returns {boolean} Returns `true` if `target` is found, else `false`.\n */\nfunction arrayIncludes(array, value) {\n  var length = array == null ? 0 : array.length;\n  return !!length && baseIndexOf(array, value, 0) > -1;\n}\n\nexport default arrayIncludes;\n","import baseFindIndex from './_baseFindIndex.js';\nimport baseIsNaN from './_baseIsNaN.js';\nimport strictIndexOf from './_strictIndexOf.js';\n\n/**\n * The base implementation of `_.indexOf` without `fromIndex` bounds checks.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {*} value The value to search for.\n * @param {number} fromIndex The index to search from.\n * @returns {number} Returns the index of the matched value, else `-1`.\n */\nfunction baseIndexOf(array, value, fromIndex) {\n  return value === value\n    ? strictIndexOf(array, value, fromIndex)\n    : baseFindIndex(array, baseIsNaN, fromIndex);\n}\n\nexport default baseIndexOf;\n","/**\n * This function is like `arrayIncludes` except that it accepts a comparator.\n *\n * @private\n * @param {Array} [array] The array to inspect.\n * @param {*} target The value to search for.\n * @param {Function} comparator The comparator invoked per element.\n * @returns {boolean} Returns `true` if `target` is found, else `false`.\n */\nfunction arrayIncludesWith(array, value, comparator) {\n  var index = -1,\n      length = array == null ? 0 : array.length;\n\n  while (++index < length) {\n    if (comparator(value, array[index])) {\n      return true;\n    }\n  }\n  return false;\n}\n\nexport default arrayIncludesWith;\n","import SetCache from './_SetCache.js';\nimport arrayIncludes from './_arrayIncludes.js';\nimport arrayIncludesWith from './_arrayIncludesWith.js';\nimport arrayMap from './_arrayMap.js';\nimport baseUnary from './_baseUnary.js';\nimport cacheHas from './_cacheHas.js';\n\n/** Used as the size to enable large array optimizations. */\nvar LARGE_ARRAY_SIZE = 200;\n\n/**\n * The base implementation of methods like `_.difference` without support\n * for excluding multiple arrays or iteratee shorthands.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {Array} values The values to exclude.\n * @param {Function} [iteratee] The iteratee invoked per element.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new array of filtered values.\n */\nfunction baseDifference(array, values, iteratee, comparator) {\n  var index = -1,\n      includes = arrayIncludes,\n      isCommon = true,\n      length = array.length,\n      result = [],\n      valuesLength = values.length;\n\n  if (!length) {\n    return result;\n  }\n  if (iteratee) {\n    values = arrayMap(values, baseUnary(iteratee));\n  }\n  if (comparator) {\n    includes = arrayIncludesWith;\n    isCommon = false;\n  }\n  else if (values.length >= LARGE_ARRAY_SIZE) {\n    includes = cacheHas;\n    isCommon = false;\n    values = new SetCache(values);\n  }\n  outer:\n  while (++index < length) {\n    var value = array[index],\n        computed = iteratee == null ? value : iteratee(value);\n\n    value = (comparator || value !== 0) ? value : 0;\n    if (isCommon && computed === computed) {\n      var valuesIndex = valuesLength;\n      while (valuesIndex--) {\n        if (values[valuesIndex] === computed) {\n          continue outer;\n        }\n      }\n      result.push(value);\n    }\n    else if (!includes(values, computed, comparator)) {\n      result.push(value);\n    }\n  }\n  return result;\n}\n\nexport default baseDifference;\n","import baseDifference from './_baseDifference.js';\nimport baseFlatten from './_baseFlatten.js';\nimport baseRest from './_baseRest.js';\nimport isArrayLikeObject from './isArrayLikeObject.js';\n\n/**\n * Creates an array of `array` values not included in the other given arrays\n * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)\n * for equality comparisons. The order and references of result values are\n * determined by the first array.\n *\n * **Note:** Unlike `_.pullAll`, this method returns a new array.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {...Array} [values] The values to exclude.\n * @returns {Array} Returns the new array of filtered values.\n * @see _.without, _.xor\n * @example\n *\n * _.difference([2, 1], [2, 3]);\n * // => [1]\n */\nvar difference = baseRest(function(array, values) {\n  return isArrayLikeObject(array)\n    ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true))\n    : [];\n});\n\nexport default difference;\n","/**\n * Performs a\n * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)\n * comparison between two values to determine if they are equivalent.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n * @example\n *\n * var object = { 'a': 1 };\n * var other = { 'a': 1 };\n *\n * _.eq(object, object);\n * // => true\n *\n * _.eq(object, other);\n * // => false\n *\n * _.eq('a', 'a');\n * // => true\n *\n * _.eq('a', Object('a'));\n * // => false\n *\n * _.eq(NaN, NaN);\n * // => true\n */\nfunction eq(value, other) {\n  return value === other || (value !== value && other !== other);\n}\n\nexport default eq;\n","/**\n * This method returns the first argument it receives.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Util\n * @param {*} value Any value.\n * @returns {*} Returns `value`.\n * @example\n *\n * var object = { 'a': 1 };\n *\n * console.log(_.identity(object) === object);\n * // => true\n */\nfunction identity(value) {\n  return value;\n}\n\nexport default identity;\n","import baseGetTag from './_baseGetTag.js';\nimport isObjectLike from './isObjectLike.js';\n\n/** `Object#toString` result references. */\nvar argsTag = '[object Arguments]';\n\n/**\n * The base implementation of `_.isArguments`.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an `arguments` object,\n */\nfunction baseIsArguments(value) {\n  return isObjectLike(value) && baseGetTag(value) == argsTag;\n}\n\nexport default baseIsArguments;\n","import baseIsArguments from './_baseIsArguments.js';\nimport isObjectLike from './isObjectLike.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/** Built-in value references. */\nvar propertyIsEnumerable = objectProto.propertyIsEnumerable;\n\n/**\n * Checks if `value` is likely an `arguments` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an `arguments` object,\n *  else `false`.\n * @example\n *\n * _.isArguments(function() { return arguments; }());\n * // => true\n *\n * _.isArguments([1, 2, 3]);\n * // => false\n */\nvar isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {\n  return isObjectLike(value) && hasOwnProperty.call(value, 'callee') &&\n    !propertyIsEnumerable.call(value, 'callee');\n};\n\nexport default isArguments;\n","/**\n * Checks if `value` is classified as an `Array` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an array, else `false`.\n * @example\n *\n * _.isArray([1, 2, 3]);\n * // => true\n *\n * _.isArray(document.body.children);\n * // => false\n *\n * _.isArray('abc');\n * // => false\n *\n * _.isArray(_.noop);\n * // => false\n */\nvar isArray = Array.isArray;\n\nexport default isArray;\n","import isFunction from './isFunction.js';\nimport isLength from './isLength.js';\n\n/**\n * Checks if `value` is array-like. A value is considered array-like if it's\n * not a function and has a `value.length` that's an integer greater than or\n * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is array-like, else `false`.\n * @example\n *\n * _.isArrayLike([1, 2, 3]);\n * // => true\n *\n * _.isArrayLike(document.body.children);\n * // => true\n *\n * _.isArrayLike('abc');\n * // => true\n *\n * _.isArrayLike(_.noop);\n * // => false\n */\nfunction isArrayLike(value) {\n  return value != null && isLength(value.length) && !isFunction(value);\n}\n\nexport default isArrayLike;\n","import isArrayLike from './isArrayLike.js';\nimport isObjectLike from './isObjectLike.js';\n\n/**\n * This method is like `_.isArrayLike` except that it also checks if `value`\n * is an object.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an array-like object,\n *  else `false`.\n * @example\n *\n * _.isArrayLikeObject([1, 2, 3]);\n * // => true\n *\n * _.isArrayLikeObject(document.body.children);\n * // => true\n *\n * _.isArrayLikeObject('abc');\n * // => false\n *\n * _.isArrayLikeObject(_.noop);\n * // => false\n */\nfunction isArrayLikeObject(value) {\n  return isObjectLike(value) && isArrayLike(value);\n}\n\nexport default isArrayLikeObject;\n","import baseGetTag from './_baseGetTag.js';\nimport isObject from './isObject.js';\n\n/** `Object#toString` result references. */\nvar asyncTag = '[object AsyncFunction]',\n    funcTag = '[object Function]',\n    genTag = '[object GeneratorFunction]',\n    proxyTag = '[object Proxy]';\n\n/**\n * Checks if `value` is classified as a `Function` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a function, else `false`.\n * @example\n *\n * _.isFunction(_);\n * // => true\n *\n * _.isFunction(/abc/);\n * // => false\n */\nfunction isFunction(value) {\n  if (!isObject(value)) {\n    return false;\n  }\n  // The use of `Object#toString` avoids issues with the `typeof` operator\n  // in Safari 9 which returns 'object' for typed arrays and other constructors.\n  var tag = baseGetTag(value);\n  return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;\n}\n\nexport default isFunction;\n","/** Used as references for various `Number` constants. */\nvar MAX_SAFE_INTEGER = 9007199254740991;\n\n/**\n * Checks if `value` is a valid array-like length.\n *\n * **Note:** This method is loosely based on\n * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.\n * @example\n *\n * _.isLength(3);\n * // => true\n *\n * _.isLength(Number.MIN_VALUE);\n * // => false\n *\n * _.isLength(Infinity);\n * // => false\n *\n * _.isLength('3');\n * // => false\n */\nfunction isLength(value) {\n  return typeof value == 'number' &&\n    value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;\n}\n\nexport default isLength;\n","/**\n * Checks if `value` is the\n * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)\n * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an object, else `false`.\n * @example\n *\n * _.isObject({});\n * // => true\n *\n * _.isObject([1, 2, 3]);\n * // => true\n *\n * _.isObject(_.noop);\n * // => true\n *\n * _.isObject(null);\n * // => false\n */\nfunction isObject(value) {\n  var type = typeof value;\n  return value != null && (type == 'object' || type == 'function');\n}\n\nexport default isObject;\n","/**\n * Checks if `value` is object-like. A value is object-like if it's not `null`\n * and has a `typeof` result of \"object\".\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is object-like, else `false`.\n * @example\n *\n * _.isObjectLike({});\n * // => true\n *\n * _.isObjectLike([1, 2, 3]);\n * // => true\n *\n * _.isObjectLike(_.noop);\n * // => false\n *\n * _.isObjectLike(null);\n * // => false\n */\nfunction isObjectLike(value) {\n  return value != null && typeof value == 'object';\n}\n\nexport default isObjectLike;\n","import { ObservableV2 } from 'lib0/observable';\nimport * as array from 'lib0/array';\nimport * as math from 'lib0/math';\nimport * as map from 'lib0/map';\nimport * as encoding from 'lib0/encoding';\nimport * as decoding from 'lib0/decoding';\nimport * as random from 'lib0/random';\nimport * as promise from 'lib0/promise';\nimport * as buffer from 'lib0/buffer';\nimport * as error from 'lib0/error';\nimport * as binary from 'lib0/binary';\nimport * as f from 'lib0/function';\nimport { callAll } from 'lib0/function';\nimport * as set from 'lib0/set';\nimport * as logging from 'lib0/logging';\nimport * as time from 'lib0/time';\nimport * as string from 'lib0/string';\nimport * as iterator from 'lib0/iterator';\nimport * as object from 'lib0/object';\n\n/**\n * This is an abstract interface that all Connectors should implement to keep them interchangeable.\n *\n * @note This interface is experimental and it is not advised to actually inherit this class.\n *       It just serves as typing information.\n *\n * @extends {ObservableV2<any>}\n */\nclass AbstractConnector extends ObservableV2 {\n  /**\n   * @param {Doc} ydoc\n   * @param {any} awareness\n   */\n  constructor (ydoc, awareness) {\n    super();\n    this.doc = ydoc;\n    this.awareness = awareness;\n  }\n}\n\nclass DeleteItem {\n  /**\n   * @param {number} clock\n   * @param {number} len\n   */\n  constructor (clock, len) {\n    /**\n     * @type {number}\n     */\n    this.clock = clock;\n    /**\n     * @type {number}\n     */\n    this.len = len;\n  }\n}\n\n/**\n * We no longer maintain a DeleteStore. DeleteSet is a temporary object that is created when needed.\n * - When created in a transaction, it must only be accessed after sorting, and merging\n *   - This DeleteSet is send to other clients\n * - We do not create a DeleteSet when we send a sync message. The DeleteSet message is created directly from StructStore\n * - We read a DeleteSet as part of a sync/update message. In this case the DeleteSet is already sorted and merged.\n */\nclass DeleteSet {\n  constructor () {\n    /**\n     * @type {Map<number,Array<DeleteItem>>}\n     */\n    this.clients = new Map();\n  }\n}\n\n/**\n * Iterate over all structs that the DeleteSet gc's.\n *\n * @param {Transaction} transaction\n * @param {DeleteSet} ds\n * @param {function(GC|Item):void} f\n *\n * @function\n */\nconst iterateDeletedStructs = (transaction, ds, f) =>\n  ds.clients.forEach((deletes, clientid) => {\n    const structs = /** @type {Array<GC|Item>} */ (transaction.doc.store.clients.get(clientid));\n    for (let i = 0; i < deletes.length; i++) {\n      const del = deletes[i];\n      iterateStructs(transaction, structs, del.clock, del.len, f);\n    }\n  });\n\n/**\n * @param {Array<DeleteItem>} dis\n * @param {number} clock\n * @return {number|null}\n *\n * @private\n * @function\n */\nconst findIndexDS = (dis, clock) => {\n  let left = 0;\n  let right = dis.length - 1;\n  while (left <= right) {\n    const midindex = math.floor((left + right) / 2);\n    const mid = dis[midindex];\n    const midclock = mid.clock;\n    if (midclock <= clock) {\n      if (clock < midclock + mid.len) {\n        return midindex\n      }\n      left = midindex + 1;\n    } else {\n      right = midindex - 1;\n    }\n  }\n  return null\n};\n\n/**\n * @param {DeleteSet} ds\n * @param {ID} id\n * @return {boolean}\n *\n * @private\n * @function\n */\nconst isDeleted = (ds, id) => {\n  const dis = ds.clients.get(id.client);\n  return dis !== undefined && findIndexDS(dis, id.clock) !== null\n};\n\n/**\n * @param {DeleteSet} ds\n *\n * @private\n * @function\n */\nconst sortAndMergeDeleteSet = ds => {\n  ds.clients.forEach(dels => {\n    dels.sort((a, b) => a.clock - b.clock);\n    // merge items without filtering or splicing the array\n    // i is the current pointer\n    // j refers to the current insert position for the pointed item\n    // try to merge dels[i] into dels[j-1] or set dels[j]=dels[i]\n    let i, j;\n    for (i = 1, j = 1; i < dels.length; i++) {\n      const left = dels[j - 1];\n      const right = dels[i];\n      if (left.clock + left.len >= right.clock) {\n        left.len = math.max(left.len, right.clock + right.len - left.clock);\n      } else {\n        if (j < i) {\n          dels[j] = right;\n        }\n        j++;\n      }\n    }\n    dels.length = j;\n  });\n};\n\n/**\n * @param {Array<DeleteSet>} dss\n * @return {DeleteSet} A fresh DeleteSet\n */\nconst mergeDeleteSets = dss => {\n  const merged = new DeleteSet();\n  for (let dssI = 0; dssI < dss.length; dssI++) {\n    dss[dssI].clients.forEach((delsLeft, client) => {\n      if (!merged.clients.has(client)) {\n        // Write all missing keys from current ds and all following.\n        // If merged already contains `client` current ds has already been added.\n        /**\n         * @type {Array<DeleteItem>}\n         */\n        const dels = delsLeft.slice();\n        for (let i = dssI + 1; i < dss.length; i++) {\n          array.appendTo(dels, dss[i].clients.get(client) || []);\n        }\n        merged.clients.set(client, dels);\n      }\n    });\n  }\n  sortAndMergeDeleteSet(merged);\n  return merged\n};\n\n/**\n * @param {DeleteSet} ds\n * @param {number} client\n * @param {number} clock\n * @param {number} length\n *\n * @private\n * @function\n */\nconst addToDeleteSet = (ds, client, clock, length) => {\n  map.setIfUndefined(ds.clients, client, () => /** @type {Array<DeleteItem>} */ ([])).push(new DeleteItem(clock, length));\n};\n\nconst createDeleteSet = () => new DeleteSet();\n\n/**\n * @param {StructStore} ss\n * @return {DeleteSet} Merged and sorted DeleteSet\n *\n * @private\n * @function\n */\nconst createDeleteSetFromStructStore = ss => {\n  const ds = createDeleteSet();\n  ss.clients.forEach((structs, client) => {\n    /**\n     * @type {Array<DeleteItem>}\n     */\n    const dsitems = [];\n    for (let i = 0; i < structs.length; i++) {\n      const struct = structs[i];\n      if (struct.deleted) {\n        const clock = struct.id.clock;\n        let len = struct.length;\n        if (i + 1 < structs.length) {\n          for (let next = structs[i + 1]; i + 1 < structs.length && next.deleted; next = structs[++i + 1]) {\n            len += next.length;\n          }\n        }\n        dsitems.push(new DeleteItem(clock, len));\n      }\n    }\n    if (dsitems.length > 0) {\n      ds.clients.set(client, dsitems);\n    }\n  });\n  return ds\n};\n\n/**\n * @param {DSEncoderV1 | DSEncoderV2} encoder\n * @param {DeleteSet} ds\n *\n * @private\n * @function\n */\nconst writeDeleteSet = (encoder, ds) => {\n  encoding.writeVarUint(encoder.restEncoder, ds.clients.size);\n\n  // Ensure that the delete set is written in a deterministic order\n  array.from(ds.clients.entries())\n    .sort((a, b) => b[0] - a[0])\n    .forEach(([client, dsitems]) => {\n      encoder.resetDsCurVal();\n      encoding.writeVarUint(encoder.restEncoder, client);\n      const len = dsitems.length;\n      encoding.writeVarUint(encoder.restEncoder, len);\n      for (let i = 0; i < len; i++) {\n        const item = dsitems[i];\n        encoder.writeDsClock(item.clock);\n        encoder.writeDsLen(item.len);\n      }\n    });\n};\n\n/**\n * @param {DSDecoderV1 | DSDecoderV2} decoder\n * @return {DeleteSet}\n *\n * @private\n * @function\n */\nconst readDeleteSet = decoder => {\n  const ds = new DeleteSet();\n  const numClients = decoding.readVarUint(decoder.restDecoder);\n  for (let i = 0; i < numClients; i++) {\n    decoder.resetDsCurVal();\n    const client = decoding.readVarUint(decoder.restDecoder);\n    const numberOfDeletes = decoding.readVarUint(decoder.restDecoder);\n    if (numberOfDeletes > 0) {\n      const dsField = map.setIfUndefined(ds.clients, client, () => /** @type {Array<DeleteItem>} */ ([]));\n      for (let i = 0; i < numberOfDeletes; i++) {\n        dsField.push(new DeleteItem(decoder.readDsClock(), decoder.readDsLen()));\n      }\n    }\n  }\n  return ds\n};\n\n/**\n * @todo YDecoder also contains references to String and other Decoders. Would make sense to exchange YDecoder.toUint8Array for YDecoder.DsToUint8Array()..\n */\n\n/**\n * @param {DSDecoderV1 | DSDecoderV2} decoder\n * @param {Transaction} transaction\n * @param {StructStore} store\n * @return {Uint8Array|null} Returns a v2 update containing all deletes that couldn't be applied yet; or null if all deletes were applied successfully.\n *\n * @private\n * @function\n */\nconst readAndApplyDeleteSet = (decoder, transaction, store) => {\n  const unappliedDS = new DeleteSet();\n  const numClients = decoding.readVarUint(decoder.restDecoder);\n  for (let i = 0; i < numClients; i++) {\n    decoder.resetDsCurVal();\n    const client = decoding.readVarUint(decoder.restDecoder);\n    const numberOfDeletes = decoding.readVarUint(decoder.restDecoder);\n    const structs = store.clients.get(client) || [];\n    const state = getState(store, client);\n    for (let i = 0; i < numberOfDeletes; i++) {\n      const clock = decoder.readDsClock();\n      const clockEnd = clock + decoder.readDsLen();\n      if (clock < state) {\n        if (state < clockEnd) {\n          addToDeleteSet(unappliedDS, client, state, clockEnd - state);\n        }\n        let index = findIndexSS(structs, clock);\n        /**\n         * We can ignore the case of GC and Delete structs, because we are going to skip them\n         * @type {Item}\n         */\n        // @ts-ignore\n        let struct = structs[index];\n        // split the first item if necessary\n        if (!struct.deleted && struct.id.clock < clock) {\n          structs.splice(index + 1, 0, splitItem(transaction, struct, clock - struct.id.clock));\n          index++; // increase we now want to use the next struct\n        }\n        while (index < structs.length) {\n          // @ts-ignore\n          struct = structs[index++];\n          if (struct.id.clock < clockEnd) {\n            if (!struct.deleted) {\n              if (clockEnd < struct.id.clock + struct.length) {\n                structs.splice(index, 0, splitItem(transaction, struct, clockEnd - struct.id.clock));\n              }\n              struct.delete(transaction);\n            }\n          } else {\n            break\n          }\n        }\n      } else {\n        addToDeleteSet(unappliedDS, client, clock, clockEnd - clock);\n      }\n    }\n  }\n  if (unappliedDS.clients.size > 0) {\n    const ds = new UpdateEncoderV2();\n    encoding.writeVarUint(ds.restEncoder, 0); // encode 0 structs\n    writeDeleteSet(ds, unappliedDS);\n    return ds.toUint8Array()\n  }\n  return null\n};\n\n/**\n * @param {DeleteSet} ds1\n * @param {DeleteSet} ds2\n */\nconst equalDeleteSets = (ds1, ds2) => {\n  if (ds1.clients.size !== ds2.clients.size) return false\n  for (const [client, deleteItems1] of ds1.clients.entries()) {\n    const deleteItems2 = /** @type {Array<import('../internals.js').DeleteItem>} */ (ds2.clients.get(client));\n    if (deleteItems2 === undefined || deleteItems1.length !== deleteItems2.length) return false\n    for (let i = 0; i < deleteItems1.length; i++) {\n      const di1 = deleteItems1[i];\n      const di2 = deleteItems2[i];\n      if (di1.clock !== di2.clock || di1.len !== di2.len) {\n        return false\n      }\n    }\n  }\n  return true\n};\n\n/**\n * @module Y\n */\n\n\nconst generateNewClientId = random.uint53;\n\n/**\n * @typedef {Object} DocOpts\n * @property {boolean} [DocOpts.gc=true] Disable garbage collection (default: gc=true)\n * @property {function(Item):boolean} [DocOpts.gcFilter] Will be called before an Item is garbage collected. Return false to keep the Item.\n * @property {string} [DocOpts.guid] Define a globally unique identifier for this document\n * @property {string | null} [DocOpts.collectionid] Associate this document with a collection. This only plays a role if your provider has a concept of collection.\n * @property {any} [DocOpts.meta] Any kind of meta information you want to associate with this document. If this is a subdocument, remote peers will store the meta information as well.\n * @property {boolean} [DocOpts.autoLoad] If a subdocument, automatically load document. If this is a subdocument, remote peers will load the document as well automatically.\n * @property {boolean} [DocOpts.shouldLoad] Whether the document should be synced by the provider now. This is toggled to true when you call ydoc.load()\n */\n\n/**\n * @typedef {Object} DocEvents\n * @property {function(Doc):void} DocEvents.destroy\n * @property {function(Doc):void} DocEvents.load\n * @property {function(boolean, Doc):void} DocEvents.sync\n * @property {function(Uint8Array, any, Doc, Transaction):void} DocEvents.update\n * @property {function(Uint8Array, any, Doc, Transaction):void} DocEvents.updateV2\n * @property {function(Doc):void} DocEvents.beforeAllTransactions\n * @property {function(Transaction, Doc):void} DocEvents.beforeTransaction\n * @property {function(Transaction, Doc):void} DocEvents.beforeObserverCalls\n * @property {function(Transaction, Doc):void} DocEvents.afterTransaction\n * @property {function(Transaction, Doc):void} DocEvents.afterTransactionCleanup\n * @property {function(Doc, Array<Transaction>):void} DocEvents.afterAllTransactions\n * @property {function({ loaded: Set<Doc>, added: Set<Doc>, removed: Set<Doc> }, Doc, Transaction):void} DocEvents.subdocs\n */\n\n/**\n * A Yjs instance handles the state of shared data.\n * @extends ObservableV2<DocEvents>\n */\nclass Doc extends ObservableV2 {\n  /**\n   * @param {DocOpts} opts configuration\n   */\n  constructor ({ guid = random.uuidv4(), collectionid = null, gc = true, gcFilter = () => true, meta = null, autoLoad = false, shouldLoad = true } = {}) {\n    super();\n    this.gc = gc;\n    this.gcFilter = gcFilter;\n    this.clientID = generateNewClientId();\n    this.guid = guid;\n    this.collectionid = collectionid;\n    /**\n     * @type {Map<string, AbstractType<YEvent<any>>>}\n     */\n    this.share = new Map();\n    this.store = new StructStore();\n    /**\n     * @type {Transaction | null}\n     */\n    this._transaction = null;\n    /**\n     * @type {Array<Transaction>}\n     */\n    this._transactionCleanups = [];\n    /**\n     * @type {Set<Doc>}\n     */\n    this.subdocs = new Set();\n    /**\n     * If this document is a subdocument - a document integrated into another document - then _item is defined.\n     * @type {Item?}\n     */\n    this._item = null;\n    this.shouldLoad = shouldLoad;\n    this.autoLoad = autoLoad;\n    this.meta = meta;\n    /**\n     * This is set to true when the persistence provider loaded the document from the database or when the `sync` event fires.\n     * Note that not all providers implement this feature. Provider authors are encouraged to fire the `load` event when the doc content is loaded from the database.\n     *\n     * @type {boolean}\n     */\n    this.isLoaded = false;\n    /**\n     * This is set to true when the connection provider has successfully synced with a backend.\n     * Note that when using peer-to-peer providers this event may not provide very useful.\n     * Also note that not all providers implement this feature. Provider authors are encouraged to fire\n     * the `sync` event when the doc has been synced (with `true` as a parameter) or if connection is\n     * lost (with false as a parameter).\n     */\n    this.isSynced = false;\n    /**\n     * Promise that resolves once the document has been loaded from a presistence provider.\n     */\n    this.whenLoaded = promise.create(resolve => {\n      this.on('load', () => {\n        this.isLoaded = true;\n        resolve(this);\n      });\n    });\n    const provideSyncedPromise = () => promise.create(resolve => {\n      /**\n       * @param {boolean} isSynced\n       */\n      const eventHandler = (isSynced) => {\n        if (isSynced === undefined || isSynced === true) {\n          this.off('sync', eventHandler);\n          resolve();\n        }\n      };\n      this.on('sync', eventHandler);\n    });\n    this.on('sync', isSynced => {\n      if (isSynced === false && this.isSynced) {\n        this.whenSynced = provideSyncedPromise();\n      }\n      this.isSynced = isSynced === undefined || isSynced === true;\n      if (this.isSynced && !this.isLoaded) {\n        this.emit('load', [this]);\n      }\n    });\n    /**\n     * Promise that resolves once the document has been synced with a backend.\n     * This promise is recreated when the connection is lost.\n     * Note the documentation about the `isSynced` property.\n     */\n    this.whenSynced = provideSyncedPromise();\n  }\n\n  /**\n   * Notify the parent document that you request to load data into this subdocument (if it is a subdocument).\n   *\n   * `load()` might be used in the future to request any provider to load the most current data.\n   *\n   * It is safe to call `load()` multiple times.\n   */\n  load () {\n    const item = this._item;\n    if (item !== null && !this.shouldLoad) {\n      transact(/** @type {any} */ (item.parent).doc, transaction => {\n        transaction.subdocsLoaded.add(this);\n      }, null, true);\n    }\n    this.shouldLoad = true;\n  }\n\n  getSubdocs () {\n    return this.subdocs\n  }\n\n  getSubdocGuids () {\n    return new Set(array.from(this.subdocs).map(doc => doc.guid))\n  }\n\n  /**\n   * Changes that happen inside of a transaction are bundled. This means that\n   * the observer fires _after_ the transaction is finished and that all changes\n   * that happened inside of the transaction are sent as one message to the\n   * other peers.\n   *\n   * @template T\n   * @param {function(Transaction):T} f The function that should be executed as a transaction\n   * @param {any} [origin] Origin of who started the transaction. Will be stored on transaction.origin\n   * @return T\n   *\n   * @public\n   */\n  transact (f, origin = null) {\n    return transact(this, f, origin)\n  }\n\n  /**\n   * Define a shared data type.\n   *\n   * Multiple calls of `ydoc.get(name, TypeConstructor)` yield the same result\n   * and do not overwrite each other. I.e.\n   * `ydoc.get(name, Y.Array) === ydoc.get(name, Y.Array)`\n   *\n   * After this method is called, the type is also available on `ydoc.share.get(name)`.\n   *\n   * *Best Practices:*\n   * Define all types right after the Y.Doc instance is created and store them in a separate object.\n   * Also use the typed methods `getText(name)`, `getArray(name)`, ..\n   *\n   * @template {typeof AbstractType<any>} Type\n   * @example\n   *   const ydoc = new Y.Doc(..)\n   *   const appState = {\n   *     document: ydoc.getText('document')\n   *     comments: ydoc.getArray('comments')\n   *   }\n   *\n   * @param {string} name\n   * @param {Type} TypeConstructor The constructor of the type definition. E.g. Y.Text, Y.Array, Y.Map, ...\n   * @return {InstanceType<Type>} The created type. Constructed with TypeConstructor\n   *\n   * @public\n   */\n  get (name, TypeConstructor = /** @type {any} */ (AbstractType)) {\n    const type = map.setIfUndefined(this.share, name, () => {\n      // @ts-ignore\n      const t = new TypeConstructor();\n      t._integrate(this, null);\n      return t\n    });\n    const Constr = type.constructor;\n    if (TypeConstructor !== AbstractType && Constr !== TypeConstructor) {\n      if (Constr === AbstractType) {\n        // @ts-ignore\n        const t = new TypeConstructor();\n        t._map = type._map;\n        type._map.forEach(/** @param {Item?} n */ n => {\n          for (; n !== null; n = n.left) {\n            // @ts-ignore\n            n.parent = t;\n          }\n        });\n        t._start = type._start;\n        for (let n = t._start; n !== null; n = n.right) {\n          n.parent = t;\n        }\n        t._length = type._length;\n        this.share.set(name, t);\n        t._integrate(this, null);\n        return /** @type {InstanceType<Type>} */ (t)\n      } else {\n        throw new Error(`Type with the name ${name} has already been defined with a different constructor`)\n      }\n    }\n    return /** @type {InstanceType<Type>} */ (type)\n  }\n\n  /**\n   * @template T\n   * @param {string} [name]\n   * @return {YArray<T>}\n   *\n   * @public\n   */\n  getArray (name = '') {\n    return /** @type {YArray<T>} */ (this.get(name, YArray))\n  }\n\n  /**\n   * @param {string} [name]\n   * @return {YText}\n   *\n   * @public\n   */\n  getText (name = '') {\n    return this.get(name, YText)\n  }\n\n  /**\n   * @template T\n   * @param {string} [name]\n   * @return {YMap<T>}\n   *\n   * @public\n   */\n  getMap (name = '') {\n    return /** @type {YMap<T>} */ (this.get(name, YMap))\n  }\n\n  /**\n   * @param {string} [name]\n   * @return {YXmlElement}\n   *\n   * @public\n   */\n  getXmlElement (name = '') {\n    return /** @type {YXmlElement<{[key:string]:string}>} */ (this.get(name, YXmlElement))\n  }\n\n  /**\n   * @param {string} [name]\n   * @return {YXmlFragment}\n   *\n   * @public\n   */\n  getXmlFragment (name = '') {\n    return this.get(name, YXmlFragment)\n  }\n\n  /**\n   * Converts the entire document into a js object, recursively traversing each yjs type\n   * Doesn't log types that have not been defined (using ydoc.getType(..)).\n   *\n   * @deprecated Do not use this method and rather call toJSON directly on the shared types.\n   *\n   * @return {Object<string, any>}\n   */\n  toJSON () {\n    /**\n     * @type {Object<string, any>}\n     */\n    const doc = {};\n\n    this.share.forEach((value, key) => {\n      doc[key] = value.toJSON();\n    });\n\n    return doc\n  }\n\n  /**\n   * Emit `destroy` event and unregister all event handlers.\n   */\n  destroy () {\n    array.from(this.subdocs).forEach(subdoc => subdoc.destroy());\n    const item = this._item;\n    if (item !== null) {\n      this._item = null;\n      const content = /** @type {ContentDoc} */ (item.content);\n      content.doc = new Doc({ guid: this.guid, ...content.opts, shouldLoad: false });\n      content.doc._item = item;\n      transact(/** @type {any} */ (item).parent.doc, transaction => {\n        const doc = content.doc;\n        if (!item.deleted) {\n          transaction.subdocsAdded.add(doc);\n        }\n        transaction.subdocsRemoved.add(this);\n      }, null, true);\n    }\n    // @ts-ignore\n    this.emit('destroyed', [true]); // DEPRECATED!\n    this.emit('destroy', [this]);\n    super.destroy();\n  }\n}\n\nclass DSDecoderV1 {\n  /**\n   * @param {decoding.Decoder} decoder\n   */\n  constructor (decoder) {\n    this.restDecoder = decoder;\n  }\n\n  resetDsCurVal () {\n    // nop\n  }\n\n  /**\n   * @return {number}\n   */\n  readDsClock () {\n    return decoding.readVarUint(this.restDecoder)\n  }\n\n  /**\n   * @return {number}\n   */\n  readDsLen () {\n    return decoding.readVarUint(this.restDecoder)\n  }\n}\n\nclass UpdateDecoderV1 extends DSDecoderV1 {\n  /**\n   * @return {ID}\n   */\n  readLeftID () {\n    return createID(decoding.readVarUint(this.restDecoder), decoding.readVarUint(this.restDecoder))\n  }\n\n  /**\n   * @return {ID}\n   */\n  readRightID () {\n    return createID(decoding.readVarUint(this.restDecoder), decoding.readVarUint(this.restDecoder))\n  }\n\n  /**\n   * Read the next client id.\n   * Use this in favor of readID whenever possible to reduce the number of objects created.\n   */\n  readClient () {\n    return decoding.readVarUint(this.restDecoder)\n  }\n\n  /**\n   * @return {number} info An unsigned 8-bit integer\n   */\n  readInfo () {\n    return decoding.readUint8(this.restDecoder)\n  }\n\n  /**\n   * @return {string}\n   */\n  readString () {\n    return decoding.readVarString(this.restDecoder)\n  }\n\n  /**\n   * @return {boolean} isKey\n   */\n  readParentInfo () {\n    return decoding.readVarUint(this.restDecoder) === 1\n  }\n\n  /**\n   * @return {number} info An unsigned 8-bit integer\n   */\n  readTypeRef () {\n    return decoding.readVarUint(this.restDecoder)\n  }\n\n  /**\n   * Write len of a struct - well suited for Opt RLE encoder.\n   *\n   * @return {number} len\n   */\n  readLen () {\n    return decoding.readVarUint(this.restDecoder)\n  }\n\n  /**\n   * @return {any}\n   */\n  readAny () {\n    return decoding.readAny(this.restDecoder)\n  }\n\n  /**\n   * @return {Uint8Array}\n   */\n  readBuf () {\n    return buffer.copyUint8Array(decoding.readVarUint8Array(this.restDecoder))\n  }\n\n  /**\n   * Legacy implementation uses JSON parse. We use any-decoding in v2.\n   *\n   * @return {any}\n   */\n  readJSON () {\n    return JSON.parse(decoding.readVarString(this.restDecoder))\n  }\n\n  /**\n   * @return {string}\n   */\n  readKey () {\n    return decoding.readVarString(this.restDecoder)\n  }\n}\n\nclass DSDecoderV2 {\n  /**\n   * @param {decoding.Decoder} decoder\n   */\n  constructor (decoder) {\n    /**\n     * @private\n     */\n    this.dsCurrVal = 0;\n    this.restDecoder = decoder;\n  }\n\n  resetDsCurVal () {\n    this.dsCurrVal = 0;\n  }\n\n  /**\n   * @return {number}\n   */\n  readDsClock () {\n    this.dsCurrVal += decoding.readVarUint(this.restDecoder);\n    return this.dsCurrVal\n  }\n\n  /**\n   * @return {number}\n   */\n  readDsLen () {\n    const diff = decoding.readVarUint(this.restDecoder) + 1;\n    this.dsCurrVal += diff;\n    return diff\n  }\n}\n\nclass UpdateDecoderV2 extends DSDecoderV2 {\n  /**\n   * @param {decoding.Decoder} decoder\n   */\n  constructor (decoder) {\n    super(decoder);\n    /**\n     * List of cached keys. If the keys[id] does not exist, we read a new key\n     * from stringEncoder and push it to keys.\n     *\n     * @type {Array<string>}\n     */\n    this.keys = [];\n    decoding.readVarUint(decoder); // read feature flag - currently unused\n    this.keyClockDecoder = new decoding.IntDiffOptRleDecoder(decoding.readVarUint8Array(decoder));\n    this.clientDecoder = new decoding.UintOptRleDecoder(decoding.readVarUint8Array(decoder));\n    this.leftClockDecoder = new decoding.IntDiffOptRleDecoder(decoding.readVarUint8Array(decoder));\n    this.rightClockDecoder = new decoding.IntDiffOptRleDecoder(decoding.readVarUint8Array(decoder));\n    this.infoDecoder = new decoding.RleDecoder(decoding.readVarUint8Array(decoder), decoding.readUint8);\n    this.stringDecoder = new decoding.StringDecoder(decoding.readVarUint8Array(decoder));\n    this.parentInfoDecoder = new decoding.RleDecoder(decoding.readVarUint8Array(decoder), decoding.readUint8);\n    this.typeRefDecoder = new decoding.UintOptRleDecoder(decoding.readVarUint8Array(decoder));\n    this.lenDecoder = new decoding.UintOptRleDecoder(decoding.readVarUint8Array(decoder));\n  }\n\n  /**\n   * @return {ID}\n   */\n  readLeftID () {\n    return new ID(this.clientDecoder.read(), this.leftClockDecoder.read())\n  }\n\n  /**\n   * @return {ID}\n   */\n  readRightID () {\n    return new ID(this.clientDecoder.read(), this.rightClockDecoder.read())\n  }\n\n  /**\n   * Read the next client id.\n   * Use this in favor of readID whenever possible to reduce the number of objects created.\n   */\n  readClient () {\n    return this.clientDecoder.read()\n  }\n\n  /**\n   * @return {number} info An unsigned 8-bit integer\n   */\n  readInfo () {\n    return /** @type {number} */ (this.infoDecoder.read())\n  }\n\n  /**\n   * @return {string}\n   */\n  readString () {\n    return this.stringDecoder.read()\n  }\n\n  /**\n   * @return {boolean}\n   */\n  readParentInfo () {\n    return this.parentInfoDecoder.read() === 1\n  }\n\n  /**\n   * @return {number} An unsigned 8-bit integer\n   */\n  readTypeRef () {\n    return this.typeRefDecoder.read()\n  }\n\n  /**\n   * Write len of a struct - well suited for Opt RLE encoder.\n   *\n   * @return {number}\n   */\n  readLen () {\n    return this.lenDecoder.read()\n  }\n\n  /**\n   * @return {any}\n   */\n  readAny () {\n    return decoding.readAny(this.restDecoder)\n  }\n\n  /**\n   * @return {Uint8Array}\n   */\n  readBuf () {\n    return decoding.readVarUint8Array(this.restDecoder)\n  }\n\n  /**\n   * This is mainly here for legacy purposes.\n   *\n   * Initial we incoded objects using JSON. Now we use the much faster lib0/any-encoder. This method mainly exists for legacy purposes for the v1 encoder.\n   *\n   * @return {any}\n   */\n  readJSON () {\n    return decoding.readAny(this.restDecoder)\n  }\n\n  /**\n   * @return {string}\n   */\n  readKey () {\n    const keyClock = this.keyClockDecoder.read();\n    if (keyClock < this.keys.length) {\n      return this.keys[keyClock]\n    } else {\n      const key = this.stringDecoder.read();\n      this.keys.push(key);\n      return key\n    }\n  }\n}\n\nclass DSEncoderV1 {\n  constructor () {\n    this.restEncoder = encoding.createEncoder();\n  }\n\n  toUint8Array () {\n    return encoding.toUint8Array(this.restEncoder)\n  }\n\n  resetDsCurVal () {\n    // nop\n  }\n\n  /**\n   * @param {number} clock\n   */\n  writeDsClock (clock) {\n    encoding.writeVarUint(this.restEncoder, clock);\n  }\n\n  /**\n   * @param {number} len\n   */\n  writeDsLen (len) {\n    encoding.writeVarUint(this.restEncoder, len);\n  }\n}\n\nclass UpdateEncoderV1 extends DSEncoderV1 {\n  /**\n   * @param {ID} id\n   */\n  writeLeftID (id) {\n    encoding.writeVarUint(this.restEncoder, id.client);\n    encoding.writeVarUint(this.restEncoder, id.clock);\n  }\n\n  /**\n   * @param {ID} id\n   */\n  writeRightID (id) {\n    encoding.writeVarUint(this.restEncoder, id.client);\n    encoding.writeVarUint(this.restEncoder, id.clock);\n  }\n\n  /**\n   * Use writeClient and writeClock instead of writeID if possible.\n   * @param {number} client\n   */\n  writeClient (client) {\n    encoding.writeVarUint(this.restEncoder, client);\n  }\n\n  /**\n   * @param {number} info An unsigned 8-bit integer\n   */\n  writeInfo (info) {\n    encoding.writeUint8(this.restEncoder, info);\n  }\n\n  /**\n   * @param {string} s\n   */\n  writeString (s) {\n    encoding.writeVarString(this.restEncoder, s);\n  }\n\n  /**\n   * @param {boolean} isYKey\n   */\n  writeParentInfo (isYKey) {\n    encoding.writeVarUint(this.restEncoder, isYKey ? 1 : 0);\n  }\n\n  /**\n   * @param {number} info An unsigned 8-bit integer\n   */\n  writeTypeRef (info) {\n    encoding.writeVarUint(this.restEncoder, info);\n  }\n\n  /**\n   * Write len of a struct - well suited for Opt RLE encoder.\n   *\n   * @param {number} len\n   */\n  writeLen (len) {\n    encoding.writeVarUint(this.restEncoder, len);\n  }\n\n  /**\n   * @param {any} any\n   */\n  writeAny (any) {\n    encoding.writeAny(this.restEncoder, any);\n  }\n\n  /**\n   * @param {Uint8Array} buf\n   */\n  writeBuf (buf) {\n    encoding.writeVarUint8Array(this.restEncoder, buf);\n  }\n\n  /**\n   * @param {any} embed\n   */\n  writeJSON (embed) {\n    encoding.writeVarString(this.restEncoder, JSON.stringify(embed));\n  }\n\n  /**\n   * @param {string} key\n   */\n  writeKey (key) {\n    encoding.writeVarString(this.restEncoder, key);\n  }\n}\n\nclass DSEncoderV2 {\n  constructor () {\n    this.restEncoder = encoding.createEncoder(); // encodes all the rest / non-optimized\n    this.dsCurrVal = 0;\n  }\n\n  toUint8Array () {\n    return encoding.toUint8Array(this.restEncoder)\n  }\n\n  resetDsCurVal () {\n    this.dsCurrVal = 0;\n  }\n\n  /**\n   * @param {number} clock\n   */\n  writeDsClock (clock) {\n    const diff = clock - this.dsCurrVal;\n    this.dsCurrVal = clock;\n    encoding.writeVarUint(this.restEncoder, diff);\n  }\n\n  /**\n   * @param {number} len\n   */\n  writeDsLen (len) {\n    if (len === 0) {\n      error.unexpectedCase();\n    }\n    encoding.writeVarUint(this.restEncoder, len - 1);\n    this.dsCurrVal += len;\n  }\n}\n\nclass UpdateEncoderV2 extends DSEncoderV2 {\n  constructor () {\n    super();\n    /**\n     * @type {Map<string,number>}\n     */\n    this.keyMap = new Map();\n    /**\n     * Refers to the next uniqe key-identifier to me used.\n     * See writeKey method for more information.\n     *\n     * @type {number}\n     */\n    this.keyClock = 0;\n    this.keyClockEncoder = new encoding.IntDiffOptRleEncoder();\n    this.clientEncoder = new encoding.UintOptRleEncoder();\n    this.leftClockEncoder = new encoding.IntDiffOptRleEncoder();\n    this.rightClockEncoder = new encoding.IntDiffOptRleEncoder();\n    this.infoEncoder = new encoding.RleEncoder(encoding.writeUint8);\n    this.stringEncoder = new encoding.StringEncoder();\n    this.parentInfoEncoder = new encoding.RleEncoder(encoding.writeUint8);\n    this.typeRefEncoder = new encoding.UintOptRleEncoder();\n    this.lenEncoder = new encoding.UintOptRleEncoder();\n  }\n\n  toUint8Array () {\n    const encoder = encoding.createEncoder();\n    encoding.writeVarUint(encoder, 0); // this is a feature flag that we might use in the future\n    encoding.writeVarUint8Array(encoder, this.keyClockEncoder.toUint8Array());\n    encoding.writeVarUint8Array(encoder, this.clientEncoder.toUint8Array());\n    encoding.writeVarUint8Array(encoder, this.leftClockEncoder.toUint8Array());\n    encoding.writeVarUint8Array(encoder, this.rightClockEncoder.toUint8Array());\n    encoding.writeVarUint8Array(encoder, encoding.toUint8Array(this.infoEncoder));\n    encoding.writeVarUint8Array(encoder, this.stringEncoder.toUint8Array());\n    encoding.writeVarUint8Array(encoder, encoding.toUint8Array(this.parentInfoEncoder));\n    encoding.writeVarUint8Array(encoder, this.typeRefEncoder.toUint8Array());\n    encoding.writeVarUint8Array(encoder, this.lenEncoder.toUint8Array());\n    // @note The rest encoder is appended! (note the missing var)\n    encoding.writeUint8Array(encoder, encoding.toUint8Array(this.restEncoder));\n    return encoding.toUint8Array(encoder)\n  }\n\n  /**\n   * @param {ID} id\n   */\n  writeLeftID (id) {\n    this.clientEncoder.write(id.client);\n    this.leftClockEncoder.write(id.clock);\n  }\n\n  /**\n   * @param {ID} id\n   */\n  writeRightID (id) {\n    this.clientEncoder.write(id.client);\n    this.rightClockEncoder.write(id.clock);\n  }\n\n  /**\n   * @param {number} client\n   */\n  writeClient (client) {\n    this.clientEncoder.write(client);\n  }\n\n  /**\n   * @param {number} info An unsigned 8-bit integer\n   */\n  writeInfo (info) {\n    this.infoEncoder.write(info);\n  }\n\n  /**\n   * @param {string} s\n   */\n  writeString (s) {\n    this.stringEncoder.write(s);\n  }\n\n  /**\n   * @param {boolean} isYKey\n   */\n  writeParentInfo (isYKey) {\n    this.parentInfoEncoder.write(isYKey ? 1 : 0);\n  }\n\n  /**\n   * @param {number} info An unsigned 8-bit integer\n   */\n  writeTypeRef (info) {\n    this.typeRefEncoder.write(info);\n  }\n\n  /**\n   * Write len of a struct - well suited for Opt RLE encoder.\n   *\n   * @param {number} len\n   */\n  writeLen (len) {\n    this.lenEncoder.write(len);\n  }\n\n  /**\n   * @param {any} any\n   */\n  writeAny (any) {\n    encoding.writeAny(this.restEncoder, any);\n  }\n\n  /**\n   * @param {Uint8Array} buf\n   */\n  writeBuf (buf) {\n    encoding.writeVarUint8Array(this.restEncoder, buf);\n  }\n\n  /**\n   * This is mainly here for legacy purposes.\n   *\n   * Initial we incoded objects using JSON. Now we use the much faster lib0/any-encoder. This method mainly exists for legacy purposes for the v1 encoder.\n   *\n   * @param {any} embed\n   */\n  writeJSON (embed) {\n    encoding.writeAny(this.restEncoder, embed);\n  }\n\n  /**\n   * Property keys are often reused. For example, in y-prosemirror the key `bold` might\n   * occur very often. For a 3d application, the key `position` might occur very often.\n   *\n   * We cache these keys in a Map and refer to them via a unique number.\n   *\n   * @param {string} key\n   */\n  writeKey (key) {\n    const clock = this.keyMap.get(key);\n    if (clock === undefined) {\n      /**\n       * @todo uncomment to introduce this feature finally\n       *\n       * Background. The ContentFormat object was always encoded using writeKey, but the decoder used to use readString.\n       * Furthermore, I forgot to set the keyclock. So everything was working fine.\n       *\n       * However, this feature here is basically useless as it is not being used (it actually only consumes extra memory).\n       *\n       * I don't know yet how to reintroduce this feature..\n       *\n       * Older clients won't be able to read updates when we reintroduce this feature. So this should probably be done using a flag.\n       *\n       */\n      // this.keyMap.set(key, this.keyClock)\n      this.keyClockEncoder.write(this.keyClock++);\n      this.stringEncoder.write(key);\n    } else {\n      this.keyClockEncoder.write(clock);\n    }\n  }\n}\n\n/**\n * @module encoding\n */\n/*\n * We use the first five bits in the info flag for determining the type of the struct.\n *\n * 0: GC\n * 1: Item with Deleted content\n * 2: Item with JSON content\n * 3: Item with Binary content\n * 4: Item with String content\n * 5: Item with Embed content (for richtext content)\n * 6: Item with Format content (a formatting marker for richtext content)\n * 7: Item with Type\n */\n\n\n/**\n * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n * @param {Array<GC|Item>} structs All structs by `client`\n * @param {number} client\n * @param {number} clock write structs starting with `ID(client,clock)`\n *\n * @function\n */\nconst writeStructs = (encoder, structs, client, clock) => {\n  // write first id\n  clock = math.max(clock, structs[0].id.clock); // make sure the first id exists\n  const startNewStructs = findIndexSS(structs, clock);\n  // write # encoded structs\n  encoding.writeVarUint(encoder.restEncoder, structs.length - startNewStructs);\n  encoder.writeClient(client);\n  encoding.writeVarUint(encoder.restEncoder, clock);\n  const firstStruct = structs[startNewStructs];\n  // write first struct with an offset\n  firstStruct.write(encoder, clock - firstStruct.id.clock);\n  for (let i = startNewStructs + 1; i < structs.length; i++) {\n    structs[i].write(encoder, 0);\n  }\n};\n\n/**\n * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n * @param {StructStore} store\n * @param {Map<number,number>} _sm\n *\n * @private\n * @function\n */\nconst writeClientsStructs = (encoder, store, _sm) => {\n  // we filter all valid _sm entries into sm\n  const sm = new Map();\n  _sm.forEach((clock, client) => {\n    // only write if new structs are available\n    if (getState(store, client) > clock) {\n      sm.set(client, clock);\n    }\n  });\n  getStateVector(store).forEach((_clock, client) => {\n    if (!_sm.has(client)) {\n      sm.set(client, 0);\n    }\n  });\n  // write # states that were updated\n  encoding.writeVarUint(encoder.restEncoder, sm.size);\n  // Write items with higher client ids first\n  // This heavily improves the conflict algorithm.\n  array.from(sm.entries()).sort((a, b) => b[0] - a[0]).forEach(([client, clock]) => {\n    writeStructs(encoder, /** @type {Array<GC|Item>} */ (store.clients.get(client)), client, clock);\n  });\n};\n\n/**\n * @param {UpdateDecoderV1 | UpdateDecoderV2} decoder The decoder object to read data from.\n * @param {Doc} doc\n * @return {Map<number, { i: number, refs: Array<Item | GC> }>}\n *\n * @private\n * @function\n */\nconst readClientsStructRefs = (decoder, doc) => {\n  /**\n   * @type {Map<number, { i: number, refs: Array<Item | GC> }>}\n   */\n  const clientRefs = map.create();\n  const numOfStateUpdates = decoding.readVarUint(decoder.restDecoder);\n  for (let i = 0; i < numOfStateUpdates; i++) {\n    const numberOfStructs = decoding.readVarUint(decoder.restDecoder);\n    /**\n     * @type {Array<GC|Item>}\n     */\n    const refs = new Array(numberOfStructs);\n    const client = decoder.readClient();\n    let clock = decoding.readVarUint(decoder.restDecoder);\n    // const start = performance.now()\n    clientRefs.set(client, { i: 0, refs });\n    for (let i = 0; i < numberOfStructs; i++) {\n      const info = decoder.readInfo();\n      switch (binary.BITS5 & info) {\n        case 0: { // GC\n          const len = decoder.readLen();\n          refs[i] = new GC(createID(client, clock), len);\n          clock += len;\n          break\n        }\n        case 10: { // Skip Struct (nothing to apply)\n          // @todo we could reduce the amount of checks by adding Skip struct to clientRefs so we know that something is missing.\n          const len = decoding.readVarUint(decoder.restDecoder);\n          refs[i] = new Skip(createID(client, clock), len);\n          clock += len;\n          break\n        }\n        default: { // Item with content\n          /**\n           * The optimized implementation doesn't use any variables because inlining variables is faster.\n           * Below a non-optimized version is shown that implements the basic algorithm with\n           * a few comments\n           */\n          const cantCopyParentInfo = (info & (binary.BIT7 | binary.BIT8)) === 0;\n          // If parent = null and neither left nor right are defined, then we know that `parent` is child of `y`\n          // and we read the next string as parentYKey.\n          // It indicates how we store/retrieve parent from `y.share`\n          // @type {string|null}\n          const struct = new Item(\n            createID(client, clock),\n            null, // left\n            (info & binary.BIT8) === binary.BIT8 ? decoder.readLeftID() : null, // origin\n            null, // right\n            (info & binary.BIT7) === binary.BIT7 ? decoder.readRightID() : null, // right origin\n            cantCopyParentInfo ? (decoder.readParentInfo() ? doc.get(decoder.readString()) : decoder.readLeftID()) : null, // parent\n            cantCopyParentInfo && (info & binary.BIT6) === binary.BIT6 ? decoder.readString() : null, // parentSub\n            readItemContent(decoder, info) // item content\n          );\n          /* A non-optimized implementation of the above algorithm:\n\n          // The item that was originally to the left of this item.\n          const origin = (info & binary.BIT8) === binary.BIT8 ? decoder.readLeftID() : null\n          // The item that was originally to the right of this item.\n          const rightOrigin = (info & binary.BIT7) === binary.BIT7 ? decoder.readRightID() : null\n          const cantCopyParentInfo = (info & (binary.BIT7 | binary.BIT8)) === 0\n          const hasParentYKey = cantCopyParentInfo ? decoder.readParentInfo() : false\n          // If parent = null and neither left nor right are defined, then we know that `parent` is child of `y`\n          // and we read the next string as parentYKey.\n          // It indicates how we store/retrieve parent from `y.share`\n          // @type {string|null}\n          const parentYKey = cantCopyParentInfo && hasParentYKey ? decoder.readString() : null\n\n          const struct = new Item(\n            createID(client, clock),\n            null, // left\n            origin, // origin\n            null, // right\n            rightOrigin, // right origin\n            cantCopyParentInfo && !hasParentYKey ? decoder.readLeftID() : (parentYKey !== null ? doc.get(parentYKey) : null), // parent\n            cantCopyParentInfo && (info & binary.BIT6) === binary.BIT6 ? decoder.readString() : null, // parentSub\n            readItemContent(decoder, info) // item content\n          )\n          */\n          refs[i] = struct;\n          clock += struct.length;\n        }\n      }\n    }\n    // console.log('time to read: ', performance.now() - start) // @todo remove\n  }\n  return clientRefs\n};\n\n/**\n * Resume computing structs generated by struct readers.\n *\n * While there is something to do, we integrate structs in this order\n * 1. top element on stack, if stack is not empty\n * 2. next element from current struct reader (if empty, use next struct reader)\n *\n * If struct causally depends on another struct (ref.missing), we put next reader of\n * `ref.id.client` on top of stack.\n *\n * At some point we find a struct that has no causal dependencies,\n * then we start emptying the stack.\n *\n * It is not possible to have circles: i.e. struct1 (from client1) depends on struct2 (from client2)\n * depends on struct3 (from client1). Therefore the max stack size is eqaul to `structReaders.length`.\n *\n * This method is implemented in a way so that we can resume computation if this update\n * causally depends on another update.\n *\n * @param {Transaction} transaction\n * @param {StructStore} store\n * @param {Map<number, { i: number, refs: (GC | Item)[] }>} clientsStructRefs\n * @return { null | { update: Uint8Array, missing: Map<number,number> } }\n *\n * @private\n * @function\n */\nconst integrateStructs = (transaction, store, clientsStructRefs) => {\n  /**\n   * @type {Array<Item | GC>}\n   */\n  const stack = [];\n  // sort them so that we take the higher id first, in case of conflicts the lower id will probably not conflict with the id from the higher user.\n  let clientsStructRefsIds = array.from(clientsStructRefs.keys()).sort((a, b) => a - b);\n  if (clientsStructRefsIds.length === 0) {\n    return null\n  }\n  const getNextStructTarget = () => {\n    if (clientsStructRefsIds.length === 0) {\n      return null\n    }\n    let nextStructsTarget = /** @type {{i:number,refs:Array<GC|Item>}} */ (clientsStructRefs.get(clientsStructRefsIds[clientsStructRefsIds.length - 1]));\n    while (nextStructsTarget.refs.length === nextStructsTarget.i) {\n      clientsStructRefsIds.pop();\n      if (clientsStructRefsIds.length > 0) {\n        nextStructsTarget = /** @type {{i:number,refs:Array<GC|Item>}} */ (clientsStructRefs.get(clientsStructRefsIds[clientsStructRefsIds.length - 1]));\n      } else {\n        return null\n      }\n    }\n    return nextStructsTarget\n  };\n  let curStructsTarget = getNextStructTarget();\n  if (curStructsTarget === null) {\n    return null\n  }\n\n  /**\n   * @type {StructStore}\n   */\n  const restStructs = new StructStore();\n  const missingSV = new Map();\n  /**\n   * @param {number} client\n   * @param {number} clock\n   */\n  const updateMissingSv = (client, clock) => {\n    const mclock = missingSV.get(client);\n    if (mclock == null || mclock > clock) {\n      missingSV.set(client, clock);\n    }\n  };\n  /**\n   * @type {GC|Item}\n   */\n  let stackHead = /** @type {any} */ (curStructsTarget).refs[/** @type {any} */ (curStructsTarget).i++];\n  // caching the state because it is used very often\n  const state = new Map();\n\n  const addStackToRestSS = () => {\n    for (const item of stack) {\n      const client = item.id.client;\n      const unapplicableItems = clientsStructRefs.get(client);\n      if (unapplicableItems) {\n        // decrement because we weren't able to apply previous operation\n        unapplicableItems.i--;\n        restStructs.clients.set(client, unapplicableItems.refs.slice(unapplicableItems.i));\n        clientsStructRefs.delete(client);\n        unapplicableItems.i = 0;\n        unapplicableItems.refs = [];\n      } else {\n        // item was the last item on clientsStructRefs and the field was already cleared. Add item to restStructs and continue\n        restStructs.clients.set(client, [item]);\n      }\n      // remove client from clientsStructRefsIds to prevent users from applying the same update again\n      clientsStructRefsIds = clientsStructRefsIds.filter(c => c !== client);\n    }\n    stack.length = 0;\n  };\n\n  // iterate over all struct readers until we are done\n  while (true) {\n    if (stackHead.constructor !== Skip) {\n      const localClock = map.setIfUndefined(state, stackHead.id.client, () => getState(store, stackHead.id.client));\n      const offset = localClock - stackHead.id.clock;\n      if (offset < 0) {\n        // update from the same client is missing\n        stack.push(stackHead);\n        updateMissingSv(stackHead.id.client, stackHead.id.clock - 1);\n        // hid a dead wall, add all items from stack to restSS\n        addStackToRestSS();\n      } else {\n        const missing = stackHead.getMissing(transaction, store);\n        if (missing !== null) {\n          stack.push(stackHead);\n          // get the struct reader that has the missing struct\n          /**\n           * @type {{ refs: Array<GC|Item>, i: number }}\n           */\n          const structRefs = clientsStructRefs.get(/** @type {number} */ (missing)) || { refs: [], i: 0 };\n          if (structRefs.refs.length === structRefs.i) {\n            // This update message causally depends on another update message that doesn't exist yet\n            updateMissingSv(/** @type {number} */ (missing), getState(store, missing));\n            addStackToRestSS();\n          } else {\n            stackHead = structRefs.refs[structRefs.i++];\n            continue\n          }\n        } else if (offset === 0 || offset < stackHead.length) {\n          // all fine, apply the stackhead\n          stackHead.integrate(transaction, offset);\n          state.set(stackHead.id.client, stackHead.id.clock + stackHead.length);\n        }\n      }\n    }\n    // iterate to next stackHead\n    if (stack.length > 0) {\n      stackHead = /** @type {GC|Item} */ (stack.pop());\n    } else if (curStructsTarget !== null && curStructsTarget.i < curStructsTarget.refs.length) {\n      stackHead = /** @type {GC|Item} */ (curStructsTarget.refs[curStructsTarget.i++]);\n    } else {\n      curStructsTarget = getNextStructTarget();\n      if (curStructsTarget === null) {\n        // we are done!\n        break\n      } else {\n        stackHead = /** @type {GC|Item} */ (curStructsTarget.refs[curStructsTarget.i++]);\n      }\n    }\n  }\n  if (restStructs.clients.size > 0) {\n    const encoder = new UpdateEncoderV2();\n    writeClientsStructs(encoder, restStructs, new Map());\n    // write empty deleteset\n    // writeDeleteSet(encoder, new DeleteSet())\n    encoding.writeVarUint(encoder.restEncoder, 0); // => no need for an extra function call, just write 0 deletes\n    return { missing: missingSV, update: encoder.toUint8Array() }\n  }\n  return null\n};\n\n/**\n * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n * @param {Transaction} transaction\n *\n * @private\n * @function\n */\nconst writeStructsFromTransaction = (encoder, transaction) => writeClientsStructs(encoder, transaction.doc.store, transaction.beforeState);\n\n/**\n * Read and apply a document update.\n *\n * This function has the same effect as `applyUpdate` but accepts a decoder.\n *\n * @param {decoding.Decoder} decoder\n * @param {Doc} ydoc\n * @param {any} [transactionOrigin] This will be stored on `transaction.origin` and `.on('update', (update, origin))`\n * @param {UpdateDecoderV1 | UpdateDecoderV2} [structDecoder]\n *\n * @function\n */\nconst readUpdateV2 = (decoder, ydoc, transactionOrigin, structDecoder = new UpdateDecoderV2(decoder)) =>\n  transact(ydoc, transaction => {\n    // force that transaction.local is set to non-local\n    transaction.local = false;\n    let retry = false;\n    const doc = transaction.doc;\n    const store = doc.store;\n    // let start = performance.now()\n    const ss = readClientsStructRefs(structDecoder, doc);\n    // console.log('time to read structs: ', performance.now() - start) // @todo remove\n    // start = performance.now()\n    // console.log('time to merge: ', performance.now() - start) // @todo remove\n    // start = performance.now()\n    const restStructs = integrateStructs(transaction, store, ss);\n    const pending = store.pendingStructs;\n    if (pending) {\n      // check if we can apply something\n      for (const [client, clock] of pending.missing) {\n        if (clock < getState(store, client)) {\n          retry = true;\n          break\n        }\n      }\n      if (restStructs) {\n        // merge restStructs into store.pending\n        for (const [client, clock] of restStructs.missing) {\n          const mclock = pending.missing.get(client);\n          if (mclock == null || mclock > clock) {\n            pending.missing.set(client, clock);\n          }\n        }\n        pending.update = mergeUpdatesV2([pending.update, restStructs.update]);\n      }\n    } else {\n      store.pendingStructs = restStructs;\n    }\n    // console.log('time to integrate: ', performance.now() - start) // @todo remove\n    // start = performance.now()\n    const dsRest = readAndApplyDeleteSet(structDecoder, transaction, store);\n    if (store.pendingDs) {\n      // @todo we could make a lower-bound state-vector check as we do above\n      const pendingDSUpdate = new UpdateDecoderV2(decoding.createDecoder(store.pendingDs));\n      decoding.readVarUint(pendingDSUpdate.restDecoder); // read 0 structs, because we only encode deletes in pendingdsupdate\n      const dsRest2 = readAndApplyDeleteSet(pendingDSUpdate, transaction, store);\n      if (dsRest && dsRest2) {\n        // case 1: ds1 != null && ds2 != null\n        store.pendingDs = mergeUpdatesV2([dsRest, dsRest2]);\n      } else {\n        // case 2: ds1 != null\n        // case 3: ds2 != null\n        // case 4: ds1 == null && ds2 == null\n        store.pendingDs = dsRest || dsRest2;\n      }\n    } else {\n      // Either dsRest == null && pendingDs == null OR dsRest != null\n      store.pendingDs = dsRest;\n    }\n    // console.log('time to cleanup: ', performance.now() - start) // @todo remove\n    // start = performance.now()\n\n    // console.log('time to resume delete readers: ', performance.now() - start) // @todo remove\n    // start = performance.now()\n    if (retry) {\n      const update = /** @type {{update: Uint8Array}} */ (store.pendingStructs).update;\n      store.pendingStructs = null;\n      applyUpdateV2(transaction.doc, update);\n    }\n  }, transactionOrigin, false);\n\n/**\n * Read and apply a document update.\n *\n * This function has the same effect as `applyUpdate` but accepts a decoder.\n *\n * @param {decoding.Decoder} decoder\n * @param {Doc} ydoc\n * @param {any} [transactionOrigin] This will be stored on `transaction.origin` and `.on('update', (update, origin))`\n *\n * @function\n */\nconst readUpdate = (decoder, ydoc, transactionOrigin) => readUpdateV2(decoder, ydoc, transactionOrigin, new UpdateDecoderV1(decoder));\n\n/**\n * Apply a document update created by, for example, `y.on('update', update => ..)` or `update = encodeStateAsUpdate()`.\n *\n * This function has the same effect as `readUpdate` but accepts an Uint8Array instead of a Decoder.\n *\n * @param {Doc} ydoc\n * @param {Uint8Array} update\n * @param {any} [transactionOrigin] This will be stored on `transaction.origin` and `.on('update', (update, origin))`\n * @param {typeof UpdateDecoderV1 | typeof UpdateDecoderV2} [YDecoder]\n *\n * @function\n */\nconst applyUpdateV2 = (ydoc, update, transactionOrigin, YDecoder = UpdateDecoderV2) => {\n  const decoder = decoding.createDecoder(update);\n  readUpdateV2(decoder, ydoc, transactionOrigin, new YDecoder(decoder));\n};\n\n/**\n * Apply a document update created by, for example, `y.on('update', update => ..)` or `update = encodeStateAsUpdate()`.\n *\n * This function has the same effect as `readUpdate` but accepts an Uint8Array instead of a Decoder.\n *\n * @param {Doc} ydoc\n * @param {Uint8Array} update\n * @param {any} [transactionOrigin] This will be stored on `transaction.origin` and `.on('update', (update, origin))`\n *\n * @function\n */\nconst applyUpdate = (ydoc, update, transactionOrigin) => applyUpdateV2(ydoc, update, transactionOrigin, UpdateDecoderV1);\n\n/**\n * Write all the document as a single update message. If you specify the state of the remote client (`targetStateVector`) it will\n * only write the operations that are missing.\n *\n * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n * @param {Doc} doc\n * @param {Map<number,number>} [targetStateVector] The state of the target that receives the update. Leave empty to write all known structs\n *\n * @function\n */\nconst writeStateAsUpdate = (encoder, doc, targetStateVector = new Map()) => {\n  writeClientsStructs(encoder, doc.store, targetStateVector);\n  writeDeleteSet(encoder, createDeleteSetFromStructStore(doc.store));\n};\n\n/**\n * Write all the document as a single update message that can be applied on the remote document. If you specify the state of the remote client (`targetState`) it will\n * only write the operations that are missing.\n *\n * Use `writeStateAsUpdate` instead if you are working with lib0/encoding.js#Encoder\n *\n * @param {Doc} doc\n * @param {Uint8Array} [encodedTargetStateVector] The state of the target that receives the update. Leave empty to write all known structs\n * @param {UpdateEncoderV1 | UpdateEncoderV2} [encoder]\n * @return {Uint8Array}\n *\n * @function\n */\nconst encodeStateAsUpdateV2 = (doc, encodedTargetStateVector = new Uint8Array([0]), encoder = new UpdateEncoderV2()) => {\n  const targetStateVector = decodeStateVector(encodedTargetStateVector);\n  writeStateAsUpdate(encoder, doc, targetStateVector);\n  const updates = [encoder.toUint8Array()];\n  // also add the pending updates (if there are any)\n  if (doc.store.pendingDs) {\n    updates.push(doc.store.pendingDs);\n  }\n  if (doc.store.pendingStructs) {\n    updates.push(diffUpdateV2(doc.store.pendingStructs.update, encodedTargetStateVector));\n  }\n  if (updates.length > 1) {\n    if (encoder.constructor === UpdateEncoderV1) {\n      return mergeUpdates(updates.map((update, i) => i === 0 ? update : convertUpdateFormatV2ToV1(update)))\n    } else if (encoder.constructor === UpdateEncoderV2) {\n      return mergeUpdatesV2(updates)\n    }\n  }\n  return updates[0]\n};\n\n/**\n * Write all the document as a single update message that can be applied on the remote document. If you specify the state of the remote client (`targetState`) it will\n * only write the operations that are missing.\n *\n * Use `writeStateAsUpdate` instead if you are working with lib0/encoding.js#Encoder\n *\n * @param {Doc} doc\n * @param {Uint8Array} [encodedTargetStateVector] The state of the target that receives the update. Leave empty to write all known structs\n * @return {Uint8Array}\n *\n * @function\n */\nconst encodeStateAsUpdate = (doc, encodedTargetStateVector) => encodeStateAsUpdateV2(doc, encodedTargetStateVector, new UpdateEncoderV1());\n\n/**\n * Read state vector from Decoder and return as Map\n *\n * @param {DSDecoderV1 | DSDecoderV2} decoder\n * @return {Map<number,number>} Maps `client` to the number next expected `clock` from that client.\n *\n * @function\n */\nconst readStateVector = decoder => {\n  const ss = new Map();\n  const ssLength = decoding.readVarUint(decoder.restDecoder);\n  for (let i = 0; i < ssLength; i++) {\n    const client = decoding.readVarUint(decoder.restDecoder);\n    const clock = decoding.readVarUint(decoder.restDecoder);\n    ss.set(client, clock);\n  }\n  return ss\n};\n\n/**\n * Read decodedState and return State as Map.\n *\n * @param {Uint8Array} decodedState\n * @return {Map<number,number>} Maps `client` to the number next expected `clock` from that client.\n *\n * @function\n */\n// export const decodeStateVectorV2 = decodedState => readStateVector(new DSDecoderV2(decoding.createDecoder(decodedState)))\n\n/**\n * Read decodedState and return State as Map.\n *\n * @param {Uint8Array} decodedState\n * @return {Map<number,number>} Maps `client` to the number next expected `clock` from that client.\n *\n * @function\n */\nconst decodeStateVector = decodedState => readStateVector(new DSDecoderV1(decoding.createDecoder(decodedState)));\n\n/**\n * @param {DSEncoderV1 | DSEncoderV2} encoder\n * @param {Map<number,number>} sv\n * @function\n */\nconst writeStateVector = (encoder, sv) => {\n  encoding.writeVarUint(encoder.restEncoder, sv.size);\n  array.from(sv.entries()).sort((a, b) => b[0] - a[0]).forEach(([client, clock]) => {\n    encoding.writeVarUint(encoder.restEncoder, client); // @todo use a special client decoder that is based on mapping\n    encoding.writeVarUint(encoder.restEncoder, clock);\n  });\n  return encoder\n};\n\n/**\n * @param {DSEncoderV1 | DSEncoderV2} encoder\n * @param {Doc} doc\n *\n * @function\n */\nconst writeDocumentStateVector = (encoder, doc) => writeStateVector(encoder, getStateVector(doc.store));\n\n/**\n * Encode State as Uint8Array.\n *\n * @param {Doc|Map<number,number>} doc\n * @param {DSEncoderV1 | DSEncoderV2} [encoder]\n * @return {Uint8Array}\n *\n * @function\n */\nconst encodeStateVectorV2 = (doc, encoder = new DSEncoderV2()) => {\n  if (doc instanceof Map) {\n    writeStateVector(encoder, doc);\n  } else {\n    writeDocumentStateVector(encoder, doc);\n  }\n  return encoder.toUint8Array()\n};\n\n/**\n * Encode State as Uint8Array.\n *\n * @param {Doc|Map<number,number>} doc\n * @return {Uint8Array}\n *\n * @function\n */\nconst encodeStateVector = doc => encodeStateVectorV2(doc, new DSEncoderV1());\n\n/**\n * General event handler implementation.\n *\n * @template ARG0, ARG1\n *\n * @private\n */\nclass EventHandler {\n  constructor () {\n    /**\n     * @type {Array<function(ARG0, ARG1):void>}\n     */\n    this.l = [];\n  }\n}\n\n/**\n * @template ARG0,ARG1\n * @returns {EventHandler<ARG0,ARG1>}\n *\n * @private\n * @function\n */\nconst createEventHandler = () => new EventHandler();\n\n/**\n * Adds an event listener that is called when\n * {@link EventHandler#callEventListeners} is called.\n *\n * @template ARG0,ARG1\n * @param {EventHandler<ARG0,ARG1>} eventHandler\n * @param {function(ARG0,ARG1):void} f The event handler.\n *\n * @private\n * @function\n */\nconst addEventHandlerListener = (eventHandler, f) =>\n  eventHandler.l.push(f);\n\n/**\n * Removes an event listener.\n *\n * @template ARG0,ARG1\n * @param {EventHandler<ARG0,ARG1>} eventHandler\n * @param {function(ARG0,ARG1):void} f The event handler that was added with\n *                     {@link EventHandler#addEventListener}\n *\n * @private\n * @function\n */\nconst removeEventHandlerListener = (eventHandler, f) => {\n  const l = eventHandler.l;\n  const len = l.length;\n  eventHandler.l = l.filter(g => f !== g);\n  if (len === eventHandler.l.length) {\n    console.error('[yjs] Tried to remove event handler that doesn\\'t exist.');\n  }\n};\n\n/**\n * Call all event listeners that were added via\n * {@link EventHandler#addEventListener}.\n *\n * @template ARG0,ARG1\n * @param {EventHandler<ARG0,ARG1>} eventHandler\n * @param {ARG0} arg0\n * @param {ARG1} arg1\n *\n * @private\n * @function\n */\nconst callEventHandlerListeners = (eventHandler, arg0, arg1) =>\n  f.callAll(eventHandler.l, [arg0, arg1]);\n\nclass ID {\n  /**\n   * @param {number} client client id\n   * @param {number} clock unique per client id, continuous number\n   */\n  constructor (client, clock) {\n    /**\n     * Client id\n     * @type {number}\n     */\n    this.client = client;\n    /**\n     * unique per client id, continuous number\n     * @type {number}\n     */\n    this.clock = clock;\n  }\n}\n\n/**\n * @param {ID | null} a\n * @param {ID | null} b\n * @return {boolean}\n *\n * @function\n */\nconst compareIDs = (a, b) => a === b || (a !== null && b !== null && a.client === b.client && a.clock === b.clock);\n\n/**\n * @param {number} client\n * @param {number} clock\n *\n * @private\n * @function\n */\nconst createID = (client, clock) => new ID(client, clock);\n\n/**\n * @param {encoding.Encoder} encoder\n * @param {ID} id\n *\n * @private\n * @function\n */\nconst writeID = (encoder, id) => {\n  encoding.writeVarUint(encoder, id.client);\n  encoding.writeVarUint(encoder, id.clock);\n};\n\n/**\n * Read ID.\n * * If first varUint read is 0xFFFFFF a RootID is returned.\n * * Otherwise an ID is returned\n *\n * @param {decoding.Decoder} decoder\n * @return {ID}\n *\n * @private\n * @function\n */\nconst readID = decoder =>\n  createID(decoding.readVarUint(decoder), decoding.readVarUint(decoder));\n\n/**\n * The top types are mapped from y.share.get(keyname) => type.\n * `type` does not store any information about the `keyname`.\n * This function finds the correct `keyname` for `type` and throws otherwise.\n *\n * @param {AbstractType<any>} type\n * @return {string}\n *\n * @private\n * @function\n */\nconst findRootTypeKey = type => {\n  // @ts-ignore _y must be defined, otherwise unexpected case\n  for (const [key, value] of type.doc.share.entries()) {\n    if (value === type) {\n      return key\n    }\n  }\n  throw error.unexpectedCase()\n};\n\n/**\n * Check if `parent` is a parent of `child`.\n *\n * @param {AbstractType<any>} parent\n * @param {Item|null} child\n * @return {Boolean} Whether `parent` is a parent of `child`.\n *\n * @private\n * @function\n */\nconst isParentOf = (parent, child) => {\n  while (child !== null) {\n    if (child.parent === parent) {\n      return true\n    }\n    child = /** @type {AbstractType<any>} */ (child.parent)._item;\n  }\n  return false\n};\n\n/**\n * Convenient helper to log type information.\n *\n * Do not use in productive systems as the output can be immense!\n *\n * @param {AbstractType<any>} type\n */\nconst logType = type => {\n  const res = [];\n  let n = type._start;\n  while (n) {\n    res.push(n);\n    n = n.right;\n  }\n  console.log('Children: ', res);\n  console.log('Children content: ', res.filter(m => !m.deleted).map(m => m.content));\n};\n\nclass PermanentUserData {\n  /**\n   * @param {Doc} doc\n   * @param {YMap<any>} [storeType]\n   */\n  constructor (doc, storeType = doc.getMap('users')) {\n    /**\n     * @type {Map<string,DeleteSet>}\n     */\n    const dss = new Map();\n    this.yusers = storeType;\n    this.doc = doc;\n    /**\n     * Maps from clientid to userDescription\n     *\n     * @type {Map<number,string>}\n     */\n    this.clients = new Map();\n    this.dss = dss;\n    /**\n     * @param {YMap<any>} user\n     * @param {string} userDescription\n     */\n    const initUser = (user, userDescription) => {\n      /**\n       * @type {YArray<Uint8Array>}\n       */\n      const ds = user.get('ds');\n      const ids = user.get('ids');\n      const addClientId = /** @param {number} clientid */ clientid => this.clients.set(clientid, userDescription);\n      ds.observe(/** @param {YArrayEvent<any>} event */ event => {\n        event.changes.added.forEach(item => {\n          item.content.getContent().forEach(encodedDs => {\n            if (encodedDs instanceof Uint8Array) {\n              this.dss.set(userDescription, mergeDeleteSets([this.dss.get(userDescription) || createDeleteSet(), readDeleteSet(new DSDecoderV1(decoding.createDecoder(encodedDs)))]));\n            }\n          });\n        });\n      });\n      this.dss.set(userDescription, mergeDeleteSets(ds.map(encodedDs => readDeleteSet(new DSDecoderV1(decoding.createDecoder(encodedDs))))));\n      ids.observe(/** @param {YArrayEvent<any>} event */ event =>\n        event.changes.added.forEach(item => item.content.getContent().forEach(addClientId))\n      );\n      ids.forEach(addClientId);\n    };\n    // observe users\n    storeType.observe(event => {\n      event.keysChanged.forEach(userDescription =>\n        initUser(storeType.get(userDescription), userDescription)\n      );\n    });\n    // add intial data\n    storeType.forEach(initUser);\n  }\n\n  /**\n   * @param {Doc} doc\n   * @param {number} clientid\n   * @param {string} userDescription\n   * @param {Object} conf\n   * @param {function(Transaction, DeleteSet):boolean} [conf.filter]\n   */\n  setUserMapping (doc, clientid, userDescription, { filter = () => true } = {}) {\n    const users = this.yusers;\n    let user = users.get(userDescription);\n    if (!user) {\n      user = new YMap();\n      user.set('ids', new YArray());\n      user.set('ds', new YArray());\n      users.set(userDescription, user);\n    }\n    user.get('ids').push([clientid]);\n    users.observe(_event => {\n      setTimeout(() => {\n        const userOverwrite = users.get(userDescription);\n        if (userOverwrite !== user) {\n          // user was overwritten, port all data over to the next user object\n          // @todo Experiment with Y.Sets here\n          user = userOverwrite;\n          // @todo iterate over old type\n          this.clients.forEach((_userDescription, clientid) => {\n            if (userDescription === _userDescription) {\n              user.get('ids').push([clientid]);\n            }\n          });\n          const encoder = new DSEncoderV1();\n          const ds = this.dss.get(userDescription);\n          if (ds) {\n            writeDeleteSet(encoder, ds);\n            user.get('ds').push([encoder.toUint8Array()]);\n          }\n        }\n      }, 0);\n    });\n    doc.on('afterTransaction', /** @param {Transaction} transaction */ transaction => {\n      setTimeout(() => {\n        const yds = user.get('ds');\n        const ds = transaction.deleteSet;\n        if (transaction.local && ds.clients.size > 0 && filter(transaction, ds)) {\n          const encoder = new DSEncoderV1();\n          writeDeleteSet(encoder, ds);\n          yds.push([encoder.toUint8Array()]);\n        }\n      });\n    });\n  }\n\n  /**\n   * @param {number} clientid\n   * @return {any}\n   */\n  getUserByClientId (clientid) {\n    return this.clients.get(clientid) || null\n  }\n\n  /**\n   * @param {ID} id\n   * @return {string | null}\n   */\n  getUserByDeletedId (id) {\n    for (const [userDescription, ds] of this.dss.entries()) {\n      if (isDeleted(ds, id)) {\n        return userDescription\n      }\n    }\n    return null\n  }\n}\n\n/**\n * A relative position is based on the Yjs model and is not affected by document changes.\n * E.g. If you place a relative position before a certain character, it will always point to this character.\n * If you place a relative position at the end of a type, it will always point to the end of the type.\n *\n * A numeric position is often unsuited for user selections, because it does not change when content is inserted\n * before or after.\n *\n * ```Insert(0, 'x')('a|bc') = 'xa|bc'``` Where | is the relative position.\n *\n * One of the properties must be defined.\n *\n * @example\n *   // Current cursor position is at position 10\n *   const relativePosition = createRelativePositionFromIndex(yText, 10)\n *   // modify yText\n *   yText.insert(0, 'abc')\n *   yText.delete(3, 10)\n *   // Compute the cursor position\n *   const absolutePosition = createAbsolutePositionFromRelativePosition(y, relativePosition)\n *   absolutePosition.type === yText // => true\n *   console.log('cursor location is ' + absolutePosition.index) // => cursor location is 3\n *\n */\nclass RelativePosition {\n  /**\n   * @param {ID|null} type\n   * @param {string|null} tname\n   * @param {ID|null} item\n   * @param {number} assoc\n   */\n  constructor (type, tname, item, assoc = 0) {\n    /**\n     * @type {ID|null}\n     */\n    this.type = type;\n    /**\n     * @type {string|null}\n     */\n    this.tname = tname;\n    /**\n     * @type {ID | null}\n     */\n    this.item = item;\n    /**\n     * A relative position is associated to a specific character. By default\n     * assoc >= 0, the relative position is associated to the character\n     * after the meant position.\n     * I.e. position 1 in 'ab' is associated to character 'b'.\n     *\n     * If assoc < 0, then the relative position is associated to the caharacter\n     * before the meant position.\n     *\n     * @type {number}\n     */\n    this.assoc = assoc;\n  }\n}\n\n/**\n * @param {RelativePosition} rpos\n * @return {any}\n */\nconst relativePositionToJSON = rpos => {\n  const json = {};\n  if (rpos.type) {\n    json.type = rpos.type;\n  }\n  if (rpos.tname) {\n    json.tname = rpos.tname;\n  }\n  if (rpos.item) {\n    json.item = rpos.item;\n  }\n  if (rpos.assoc != null) {\n    json.assoc = rpos.assoc;\n  }\n  return json\n};\n\n/**\n * @param {any} json\n * @return {RelativePosition}\n *\n * @function\n */\nconst createRelativePositionFromJSON = json => new RelativePosition(json.type == null ? null : createID(json.type.client, json.type.clock), json.tname ?? null, json.item == null ? null : createID(json.item.client, json.item.clock), json.assoc == null ? 0 : json.assoc);\n\nclass AbsolutePosition {\n  /**\n   * @param {AbstractType<any>} type\n   * @param {number} index\n   * @param {number} [assoc]\n   */\n  constructor (type, index, assoc = 0) {\n    /**\n     * @type {AbstractType<any>}\n     */\n    this.type = type;\n    /**\n     * @type {number}\n     */\n    this.index = index;\n    this.assoc = assoc;\n  }\n}\n\n/**\n * @param {AbstractType<any>} type\n * @param {number} index\n * @param {number} [assoc]\n *\n * @function\n */\nconst createAbsolutePosition = (type, index, assoc = 0) => new AbsolutePosition(type, index, assoc);\n\n/**\n * @param {AbstractType<any>} type\n * @param {ID|null} item\n * @param {number} [assoc]\n *\n * @function\n */\nconst createRelativePosition = (type, item, assoc) => {\n  let typeid = null;\n  let tname = null;\n  if (type._item === null) {\n    tname = findRootTypeKey(type);\n  } else {\n    typeid = createID(type._item.id.client, type._item.id.clock);\n  }\n  return new RelativePosition(typeid, tname, item, assoc)\n};\n\n/**\n * Create a relativePosition based on a absolute position.\n *\n * @param {AbstractType<any>} type The base type (e.g. YText or YArray).\n * @param {number} index The absolute position.\n * @param {number} [assoc]\n * @return {RelativePosition}\n *\n * @function\n */\nconst createRelativePositionFromTypeIndex = (type, index, assoc = 0) => {\n  let t = type._start;\n  if (assoc < 0) {\n    // associated to the left character or the beginning of a type, increment index if possible.\n    if (index === 0) {\n      return createRelativePosition(type, null, assoc)\n    }\n    index--;\n  }\n  while (t !== null) {\n    if (!t.deleted && t.countable) {\n      if (t.length > index) {\n        // case 1: found position somewhere in the linked list\n        return createRelativePosition(type, createID(t.id.client, t.id.clock + index), assoc)\n      }\n      index -= t.length;\n    }\n    if (t.right === null && assoc < 0) {\n      // left-associated position, return last available id\n      return createRelativePosition(type, t.lastId, assoc)\n    }\n    t = t.right;\n  }\n  return createRelativePosition(type, null, assoc)\n};\n\n/**\n * @param {encoding.Encoder} encoder\n * @param {RelativePosition} rpos\n *\n * @function\n */\nconst writeRelativePosition = (encoder, rpos) => {\n  const { type, tname, item, assoc } = rpos;\n  if (item !== null) {\n    encoding.writeVarUint(encoder, 0);\n    writeID(encoder, item);\n  } else if (tname !== null) {\n    // case 2: found position at the end of the list and type is stored in y.share\n    encoding.writeUint8(encoder, 1);\n    encoding.writeVarString(encoder, tname);\n  } else if (type !== null) {\n    // case 3: found position at the end of the list and type is attached to an item\n    encoding.writeUint8(encoder, 2);\n    writeID(encoder, type);\n  } else {\n    throw error.unexpectedCase()\n  }\n  encoding.writeVarInt(encoder, assoc);\n  return encoder\n};\n\n/**\n * @param {RelativePosition} rpos\n * @return {Uint8Array}\n */\nconst encodeRelativePosition = rpos => {\n  const encoder = encoding.createEncoder();\n  writeRelativePosition(encoder, rpos);\n  return encoding.toUint8Array(encoder)\n};\n\n/**\n * @param {decoding.Decoder} decoder\n * @return {RelativePosition}\n *\n * @function\n */\nconst readRelativePosition = decoder => {\n  let type = null;\n  let tname = null;\n  let itemID = null;\n  switch (decoding.readVarUint(decoder)) {\n    case 0:\n      // case 1: found position somewhere in the linked list\n      itemID = readID(decoder);\n      break\n    case 1:\n      // case 2: found position at the end of the list and type is stored in y.share\n      tname = decoding.readVarString(decoder);\n      break\n    case 2: {\n      // case 3: found position at the end of the list and type is attached to an item\n      type = readID(decoder);\n    }\n  }\n  const assoc = decoding.hasContent(decoder) ? decoding.readVarInt(decoder) : 0;\n  return new RelativePosition(type, tname, itemID, assoc)\n};\n\n/**\n * @param {Uint8Array} uint8Array\n * @return {RelativePosition}\n */\nconst decodeRelativePosition = uint8Array => readRelativePosition(decoding.createDecoder(uint8Array));\n\n/**\n * Transform a relative position to an absolute position.\n *\n * If you want to share the relative position with other users, you should set\n * `followUndoneDeletions` to false to get consistent results across all clients.\n *\n * When calculating the absolute position, we try to follow the \"undone deletions\". This yields\n * better results for the user who performed undo. However, only the user who performed the undo\n * will get the better results, the other users don't know which operations recreated a deleted\n * range of content. There is more information in this ticket: https://github.com/yjs/yjs/issues/638\n *\n * @param {RelativePosition} rpos\n * @param {Doc} doc\n * @param {boolean} followUndoneDeletions - whether to follow undone deletions - see https://github.com/yjs/yjs/issues/638\n * @return {AbsolutePosition|null}\n *\n * @function\n */\nconst createAbsolutePositionFromRelativePosition = (rpos, doc, followUndoneDeletions = true) => {\n  const store = doc.store;\n  const rightID = rpos.item;\n  const typeID = rpos.type;\n  const tname = rpos.tname;\n  const assoc = rpos.assoc;\n  let type = null;\n  let index = 0;\n  if (rightID !== null) {\n    if (getState(store, rightID.client) <= rightID.clock) {\n      return null\n    }\n    const res = followUndoneDeletions ? followRedone(store, rightID) : { item: getItem(store, rightID), diff: 0 };\n    const right = res.item;\n    if (!(right instanceof Item)) {\n      return null\n    }\n    type = /** @type {AbstractType<any>} */ (right.parent);\n    if (type._item === null || !type._item.deleted) {\n      index = (right.deleted || !right.countable) ? 0 : (res.diff + (assoc >= 0 ? 0 : 1)); // adjust position based on left association if necessary\n      let n = right.left;\n      while (n !== null) {\n        if (!n.deleted && n.countable) {\n          index += n.length;\n        }\n        n = n.left;\n      }\n    }\n  } else {\n    if (tname !== null) {\n      type = doc.get(tname);\n    } else if (typeID !== null) {\n      if (getState(store, typeID.client) <= typeID.clock) {\n        // type does not exist yet\n        return null\n      }\n      const { item } = followUndoneDeletions ? followRedone(store, typeID) : { item: getItem(store, typeID) };\n      if (item instanceof Item && item.content instanceof ContentType) {\n        type = item.content.type;\n      } else {\n        // struct is garbage collected\n        return null\n      }\n    } else {\n      throw error.unexpectedCase()\n    }\n    if (assoc >= 0) {\n      index = type._length;\n    } else {\n      index = 0;\n    }\n  }\n  return createAbsolutePosition(type, index, rpos.assoc)\n};\n\n/**\n * @param {RelativePosition|null} a\n * @param {RelativePosition|null} b\n * @return {boolean}\n *\n * @function\n */\nconst compareRelativePositions = (a, b) => a === b || (\n  a !== null && b !== null && a.tname === b.tname && compareIDs(a.item, b.item) && compareIDs(a.type, b.type) && a.assoc === b.assoc\n);\n\nclass Snapshot {\n  /**\n   * @param {DeleteSet} ds\n   * @param {Map<number,number>} sv state map\n   */\n  constructor (ds, sv) {\n    /**\n     * @type {DeleteSet}\n     */\n    this.ds = ds;\n    /**\n     * State Map\n     * @type {Map<number,number>}\n     */\n    this.sv = sv;\n  }\n}\n\n/**\n * @param {Snapshot} snap1\n * @param {Snapshot} snap2\n * @return {boolean}\n */\nconst equalSnapshots = (snap1, snap2) => {\n  const ds1 = snap1.ds.clients;\n  const ds2 = snap2.ds.clients;\n  const sv1 = snap1.sv;\n  const sv2 = snap2.sv;\n  if (sv1.size !== sv2.size || ds1.size !== ds2.size) {\n    return false\n  }\n  for (const [key, value] of sv1.entries()) {\n    if (sv2.get(key) !== value) {\n      return false\n    }\n  }\n  for (const [client, dsitems1] of ds1.entries()) {\n    const dsitems2 = ds2.get(client) || [];\n    if (dsitems1.length !== dsitems2.length) {\n      return false\n    }\n    for (let i = 0; i < dsitems1.length; i++) {\n      const dsitem1 = dsitems1[i];\n      const dsitem2 = dsitems2[i];\n      if (dsitem1.clock !== dsitem2.clock || dsitem1.len !== dsitem2.len) {\n        return false\n      }\n    }\n  }\n  return true\n};\n\n/**\n * @param {Snapshot} snapshot\n * @param {DSEncoderV1 | DSEncoderV2} [encoder]\n * @return {Uint8Array}\n */\nconst encodeSnapshotV2 = (snapshot, encoder = new DSEncoderV2()) => {\n  writeDeleteSet(encoder, snapshot.ds);\n  writeStateVector(encoder, snapshot.sv);\n  return encoder.toUint8Array()\n};\n\n/**\n * @param {Snapshot} snapshot\n * @return {Uint8Array}\n */\nconst encodeSnapshot = snapshot => encodeSnapshotV2(snapshot, new DSEncoderV1());\n\n/**\n * @param {Uint8Array} buf\n * @param {DSDecoderV1 | DSDecoderV2} [decoder]\n * @return {Snapshot}\n */\nconst decodeSnapshotV2 = (buf, decoder = new DSDecoderV2(decoding.createDecoder(buf))) => {\n  return new Snapshot(readDeleteSet(decoder), readStateVector(decoder))\n};\n\n/**\n * @param {Uint8Array} buf\n * @return {Snapshot}\n */\nconst decodeSnapshot = buf => decodeSnapshotV2(buf, new DSDecoderV1(decoding.createDecoder(buf)));\n\n/**\n * @param {DeleteSet} ds\n * @param {Map<number,number>} sm\n * @return {Snapshot}\n */\nconst createSnapshot = (ds, sm) => new Snapshot(ds, sm);\n\nconst emptySnapshot = createSnapshot(createDeleteSet(), new Map());\n\n/**\n * @param {Doc} doc\n * @return {Snapshot}\n */\nconst snapshot = doc => createSnapshot(createDeleteSetFromStructStore(doc.store), getStateVector(doc.store));\n\n/**\n * @param {Item} item\n * @param {Snapshot|undefined} snapshot\n *\n * @protected\n * @function\n */\nconst isVisible = (item, snapshot) => snapshot === undefined\n  ? !item.deleted\n  : snapshot.sv.has(item.id.client) && (snapshot.sv.get(item.id.client) || 0) > item.id.clock && !isDeleted(snapshot.ds, item.id);\n\n/**\n * @param {Transaction} transaction\n * @param {Snapshot} snapshot\n */\nconst splitSnapshotAffectedStructs = (transaction, snapshot) => {\n  const meta = map.setIfUndefined(transaction.meta, splitSnapshotAffectedStructs, set.create);\n  const store = transaction.doc.store;\n  // check if we already split for this snapshot\n  if (!meta.has(snapshot)) {\n    snapshot.sv.forEach((clock, client) => {\n      if (clock < getState(store, client)) {\n        getItemCleanStart(transaction, createID(client, clock));\n      }\n    });\n    iterateDeletedStructs(transaction, snapshot.ds, _item => {});\n    meta.add(snapshot);\n  }\n};\n\n/**\n * @example\n *  const ydoc = new Y.Doc({ gc: false })\n *  ydoc.getText().insert(0, 'world!')\n *  const snapshot = Y.snapshot(ydoc)\n *  ydoc.getText().insert(0, 'hello ')\n *  const restored = Y.createDocFromSnapshot(ydoc, snapshot)\n *  assert(restored.getText().toString() === 'world!')\n *\n * @param {Doc} originDoc\n * @param {Snapshot} snapshot\n * @param {Doc} [newDoc] Optionally, you may define the Yjs document that receives the data from originDoc\n * @return {Doc}\n */\nconst createDocFromSnapshot = (originDoc, snapshot, newDoc = new Doc()) => {\n  if (originDoc.gc) {\n    // we should not try to restore a GC-ed document, because some of the restored items might have their content deleted\n    throw new Error('Garbage-collection must be disabled in `originDoc`!')\n  }\n  const { sv, ds } = snapshot;\n\n  const encoder = new UpdateEncoderV2();\n  originDoc.transact(transaction => {\n    let size = 0;\n    sv.forEach(clock => {\n      if (clock > 0) {\n        size++;\n      }\n    });\n    encoding.writeVarUint(encoder.restEncoder, size);\n    // splitting the structs before writing them to the encoder\n    for (const [client, clock] of sv) {\n      if (clock === 0) {\n        continue\n      }\n      if (clock < getState(originDoc.store, client)) {\n        getItemCleanStart(transaction, createID(client, clock));\n      }\n      const structs = originDoc.store.clients.get(client) || [];\n      const lastStructIndex = findIndexSS(structs, clock - 1);\n      // write # encoded structs\n      encoding.writeVarUint(encoder.restEncoder, lastStructIndex + 1);\n      encoder.writeClient(client);\n      // first clock written is 0\n      encoding.writeVarUint(encoder.restEncoder, 0);\n      for (let i = 0; i <= lastStructIndex; i++) {\n        structs[i].write(encoder, 0);\n      }\n    }\n    writeDeleteSet(encoder, ds);\n  });\n\n  applyUpdateV2(newDoc, encoder.toUint8Array(), 'snapshot');\n  return newDoc\n};\n\n/**\n * @param {Snapshot} snapshot\n * @param {Uint8Array} update\n * @param {typeof UpdateDecoderV2 | typeof UpdateDecoderV1} [YDecoder]\n */\nconst snapshotContainsUpdateV2 = (snapshot, update, YDecoder = UpdateDecoderV2) => {\n  const updateDecoder = new YDecoder(decoding.createDecoder(update));\n  const lazyDecoder = new LazyStructReader(updateDecoder, false);\n  for (let curr = lazyDecoder.curr; curr !== null; curr = lazyDecoder.next()) {\n    if ((snapshot.sv.get(curr.id.client) || 0) < curr.id.clock + curr.length) {\n      return false\n    }\n  }\n  const mergedDS = mergeDeleteSets([snapshot.ds, readDeleteSet(updateDecoder)]);\n  return equalDeleteSets(snapshot.ds, mergedDS)\n};\n\n/**\n * @param {Snapshot} snapshot\n * @param {Uint8Array} update\n */\nconst snapshotContainsUpdate = (snapshot, update) => snapshotContainsUpdateV2(snapshot, update, UpdateDecoderV1);\n\nclass StructStore {\n  constructor () {\n    /**\n     * @type {Map<number,Array<GC|Item>>}\n     */\n    this.clients = new Map();\n    /**\n     * @type {null | { missing: Map<number, number>, update: Uint8Array }}\n     */\n    this.pendingStructs = null;\n    /**\n     * @type {null | Uint8Array}\n     */\n    this.pendingDs = null;\n  }\n}\n\n/**\n * Return the states as a Map<client,clock>.\n * Note that clock refers to the next expected clock id.\n *\n * @param {StructStore} store\n * @return {Map<number,number>}\n *\n * @public\n * @function\n */\nconst getStateVector = store => {\n  const sm = new Map();\n  store.clients.forEach((structs, client) => {\n    const struct = structs[structs.length - 1];\n    sm.set(client, struct.id.clock + struct.length);\n  });\n  return sm\n};\n\n/**\n * @param {StructStore} store\n * @param {number} client\n * @return {number}\n *\n * @public\n * @function\n */\nconst getState = (store, client) => {\n  const structs = store.clients.get(client);\n  if (structs === undefined) {\n    return 0\n  }\n  const lastStruct = structs[structs.length - 1];\n  return lastStruct.id.clock + lastStruct.length\n};\n\n/**\n * @param {StructStore} store\n * @param {GC|Item} struct\n *\n * @private\n * @function\n */\nconst addStruct = (store, struct) => {\n  let structs = store.clients.get(struct.id.client);\n  if (structs === undefined) {\n    structs = [];\n    store.clients.set(struct.id.client, structs);\n  } else {\n    const lastStruct = structs[structs.length - 1];\n    if (lastStruct.id.clock + lastStruct.length !== struct.id.clock) {\n      throw error.unexpectedCase()\n    }\n  }\n  structs.push(struct);\n};\n\n/**\n * Perform a binary search on a sorted array\n * @param {Array<Item|GC>} structs\n * @param {number} clock\n * @return {number}\n *\n * @private\n * @function\n */\nconst findIndexSS = (structs, clock) => {\n  let left = 0;\n  let right = structs.length - 1;\n  let mid = structs[right];\n  let midclock = mid.id.clock;\n  if (midclock === clock) {\n    return right\n  }\n  // @todo does it even make sense to pivot the search?\n  // If a good split misses, it might actually increase the time to find the correct item.\n  // Currently, the only advantage is that search with pivoting might find the item on the first try.\n  let midindex = math.floor((clock / (midclock + mid.length - 1)) * right); // pivoting the search\n  while (left <= right) {\n    mid = structs[midindex];\n    midclock = mid.id.clock;\n    if (midclock <= clock) {\n      if (clock < midclock + mid.length) {\n        return midindex\n      }\n      left = midindex + 1;\n    } else {\n      right = midindex - 1;\n    }\n    midindex = math.floor((left + right) / 2);\n  }\n  // Always check state before looking for a struct in StructStore\n  // Therefore the case of not finding a struct is unexpected\n  throw error.unexpectedCase()\n};\n\n/**\n * Expects that id is actually in store. This function throws or is an infinite loop otherwise.\n *\n * @param {StructStore} store\n * @param {ID} id\n * @return {GC|Item}\n *\n * @private\n * @function\n */\nconst find = (store, id) => {\n  /**\n   * @type {Array<GC|Item>}\n   */\n  // @ts-ignore\n  const structs = store.clients.get(id.client);\n  return structs[findIndexSS(structs, id.clock)]\n};\n\n/**\n * Expects that id is actually in store. This function throws or is an infinite loop otherwise.\n * @private\n * @function\n */\nconst getItem = /** @type {function(StructStore,ID):Item} */ (find);\n\n/**\n * @param {Transaction} transaction\n * @param {Array<Item|GC>} structs\n * @param {number} clock\n */\nconst findIndexCleanStart = (transaction, structs, clock) => {\n  const index = findIndexSS(structs, clock);\n  const struct = structs[index];\n  if (struct.id.clock < clock && struct instanceof Item) {\n    structs.splice(index + 1, 0, splitItem(transaction, struct, clock - struct.id.clock));\n    return index + 1\n  }\n  return index\n};\n\n/**\n * Expects that id is actually in store. This function throws or is an infinite loop otherwise.\n *\n * @param {Transaction} transaction\n * @param {ID} id\n * @return {Item}\n *\n * @private\n * @function\n */\nconst getItemCleanStart = (transaction, id) => {\n  const structs = /** @type {Array<Item>} */ (transaction.doc.store.clients.get(id.client));\n  return structs[findIndexCleanStart(transaction, structs, id.clock)]\n};\n\n/**\n * Expects that id is actually in store. This function throws or is an infinite loop otherwise.\n *\n * @param {Transaction} transaction\n * @param {StructStore} store\n * @param {ID} id\n * @return {Item}\n *\n * @private\n * @function\n */\nconst getItemCleanEnd = (transaction, store, id) => {\n  /**\n   * @type {Array<Item>}\n   */\n  // @ts-ignore\n  const structs = store.clients.get(id.client);\n  const index = findIndexSS(structs, id.clock);\n  const struct = structs[index];\n  if (id.clock !== struct.id.clock + struct.length - 1 && struct.constructor !== GC) {\n    structs.splice(index + 1, 0, splitItem(transaction, struct, id.clock - struct.id.clock + 1));\n  }\n  return struct\n};\n\n/**\n * Replace `item` with `newitem` in store\n * @param {StructStore} store\n * @param {GC|Item} struct\n * @param {GC|Item} newStruct\n *\n * @private\n * @function\n */\nconst replaceStruct = (store, struct, newStruct) => {\n  const structs = /** @type {Array<GC|Item>} */ (store.clients.get(struct.id.client));\n  structs[findIndexSS(structs, struct.id.clock)] = newStruct;\n};\n\n/**\n * Iterate over a range of structs\n *\n * @param {Transaction} transaction\n * @param {Array<Item|GC>} structs\n * @param {number} clockStart Inclusive start\n * @param {number} len\n * @param {function(GC|Item):void} f\n *\n * @function\n */\nconst iterateStructs = (transaction, structs, clockStart, len, f) => {\n  if (len === 0) {\n    return\n  }\n  const clockEnd = clockStart + len;\n  let index = findIndexCleanStart(transaction, structs, clockStart);\n  let struct;\n  do {\n    struct = structs[index++];\n    if (clockEnd < struct.id.clock + struct.length) {\n      findIndexCleanStart(transaction, structs, clockEnd);\n    }\n    f(struct);\n  } while (index < structs.length && structs[index].id.clock < clockEnd)\n};\n\n/**\n * A transaction is created for every change on the Yjs model. It is possible\n * to bundle changes on the Yjs model in a single transaction to\n * minimize the number on messages sent and the number of observer calls.\n * If possible the user of this library should bundle as many changes as\n * possible. Here is an example to illustrate the advantages of bundling:\n *\n * @example\n * const ydoc = new Y.Doc()\n * const map = ydoc.getMap('map')\n * // Log content when change is triggered\n * map.observe(() => {\n *   console.log('change triggered')\n * })\n * // Each change on the map type triggers a log message:\n * map.set('a', 0) // => \"change triggered\"\n * map.set('b', 0) // => \"change triggered\"\n * // When put in a transaction, it will trigger the log after the transaction:\n * ydoc.transact(() => {\n *   map.set('a', 1)\n *   map.set('b', 1)\n * }) // => \"change triggered\"\n *\n * @public\n */\nclass Transaction {\n  /**\n   * @param {Doc} doc\n   * @param {any} origin\n   * @param {boolean} local\n   */\n  constructor (doc, origin, local) {\n    /**\n     * The Yjs instance.\n     * @type {Doc}\n     */\n    this.doc = doc;\n    /**\n     * Describes the set of deleted items by ids\n     * @type {DeleteSet}\n     */\n    this.deleteSet = new DeleteSet();\n    /**\n     * Holds the state before the transaction started.\n     * @type {Map<Number,Number>}\n     */\n    this.beforeState = getStateVector(doc.store);\n    /**\n     * Holds the state after the transaction.\n     * @type {Map<Number,Number>}\n     */\n    this.afterState = new Map();\n    /**\n     * All types that were directly modified (property added or child\n     * inserted/deleted). New types are not included in this Set.\n     * Maps from type to parentSubs (`item.parentSub = null` for YArray)\n     * @type {Map<AbstractType<YEvent<any>>,Set<String|null>>}\n     */\n    this.changed = new Map();\n    /**\n     * Stores the events for the types that observe also child elements.\n     * It is mainly used by `observeDeep`.\n     * @type {Map<AbstractType<YEvent<any>>,Array<YEvent<any>>>}\n     */\n    this.changedParentTypes = new Map();\n    /**\n     * @type {Array<AbstractStruct>}\n     */\n    this._mergeStructs = [];\n    /**\n     * @type {any}\n     */\n    this.origin = origin;\n    /**\n     * Stores meta information on the transaction\n     * @type {Map<any,any>}\n     */\n    this.meta = new Map();\n    /**\n     * Whether this change originates from this doc.\n     * @type {boolean}\n     */\n    this.local = local;\n    /**\n     * @type {Set<Doc>}\n     */\n    this.subdocsAdded = new Set();\n    /**\n     * @type {Set<Doc>}\n     */\n    this.subdocsRemoved = new Set();\n    /**\n     * @type {Set<Doc>}\n     */\n    this.subdocsLoaded = new Set();\n    /**\n     * @type {boolean}\n     */\n    this._needFormattingCleanup = false;\n  }\n}\n\n/**\n * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n * @param {Transaction} transaction\n * @return {boolean} Whether data was written.\n */\nconst writeUpdateMessageFromTransaction = (encoder, transaction) => {\n  if (transaction.deleteSet.clients.size === 0 && !map.any(transaction.afterState, (clock, client) => transaction.beforeState.get(client) !== clock)) {\n    return false\n  }\n  sortAndMergeDeleteSet(transaction.deleteSet);\n  writeStructsFromTransaction(encoder, transaction);\n  writeDeleteSet(encoder, transaction.deleteSet);\n  return true\n};\n\n/**\n * If `type.parent` was added in current transaction, `type` technically\n * did not change, it was just added and we should not fire events for `type`.\n *\n * @param {Transaction} transaction\n * @param {AbstractType<YEvent<any>>} type\n * @param {string|null} parentSub\n */\nconst addChangedTypeToTransaction = (transaction, type, parentSub) => {\n  const item = type._item;\n  if (item === null || (item.id.clock < (transaction.beforeState.get(item.id.client) || 0) && !item.deleted)) {\n    map.setIfUndefined(transaction.changed, type, set.create).add(parentSub);\n  }\n};\n\n/**\n * @param {Array<AbstractStruct>} structs\n * @param {number} pos\n * @return {number} # of merged structs\n */\nconst tryToMergeWithLefts = (structs, pos) => {\n  let right = structs[pos];\n  let left = structs[pos - 1];\n  let i = pos;\n  for (; i > 0; right = left, left = structs[--i - 1]) {\n    if (left.deleted === right.deleted && left.constructor === right.constructor) {\n      if (left.mergeWith(right)) {\n        if (right instanceof Item && right.parentSub !== null && /** @type {AbstractType<any>} */ (right.parent)._map.get(right.parentSub) === right) {\n          /** @type {AbstractType<any>} */ (right.parent)._map.set(right.parentSub, /** @type {Item} */ (left));\n        }\n        continue\n      }\n    }\n    break\n  }\n  const merged = pos - i;\n  if (merged) {\n    // remove all merged structs from the array\n    structs.splice(pos + 1 - merged, merged);\n  }\n  return merged\n};\n\n/**\n * @param {DeleteSet} ds\n * @param {StructStore} store\n * @param {function(Item):boolean} gcFilter\n */\nconst tryGcDeleteSet = (ds, store, gcFilter) => {\n  for (const [client, deleteItems] of ds.clients.entries()) {\n    const structs = /** @type {Array<GC|Item>} */ (store.clients.get(client));\n    for (let di = deleteItems.length - 1; di >= 0; di--) {\n      const deleteItem = deleteItems[di];\n      const endDeleteItemClock = deleteItem.clock + deleteItem.len;\n      for (\n        let si = findIndexSS(structs, deleteItem.clock), struct = structs[si];\n        si < structs.length && struct.id.clock < endDeleteItemClock;\n        struct = structs[++si]\n      ) {\n        const struct = structs[si];\n        if (deleteItem.clock + deleteItem.len <= struct.id.clock) {\n          break\n        }\n        if (struct instanceof Item && struct.deleted && !struct.keep && gcFilter(struct)) {\n          struct.gc(store, false);\n        }\n      }\n    }\n  }\n};\n\n/**\n * @param {DeleteSet} ds\n * @param {StructStore} store\n */\nconst tryMergeDeleteSet = (ds, store) => {\n  // try to merge deleted / gc'd items\n  // merge from right to left for better efficiency and so we don't miss any merge targets\n  ds.clients.forEach((deleteItems, client) => {\n    const structs = /** @type {Array<GC|Item>} */ (store.clients.get(client));\n    for (let di = deleteItems.length - 1; di >= 0; di--) {\n      const deleteItem = deleteItems[di];\n      // start with merging the item next to the last deleted item\n      const mostRightIndexToCheck = math.min(structs.length - 1, 1 + findIndexSS(structs, deleteItem.clock + deleteItem.len - 1));\n      for (\n        let si = mostRightIndexToCheck, struct = structs[si];\n        si > 0 && struct.id.clock >= deleteItem.clock;\n        struct = structs[si]\n      ) {\n        si -= 1 + tryToMergeWithLefts(structs, si);\n      }\n    }\n  });\n};\n\n/**\n * @param {DeleteSet} ds\n * @param {StructStore} store\n * @param {function(Item):boolean} gcFilter\n */\nconst tryGc = (ds, store, gcFilter) => {\n  tryGcDeleteSet(ds, store, gcFilter);\n  tryMergeDeleteSet(ds, store);\n};\n\n/**\n * @param {Array<Transaction>} transactionCleanups\n * @param {number} i\n */\nconst cleanupTransactions = (transactionCleanups, i) => {\n  if (i < transactionCleanups.length) {\n    const transaction = transactionCleanups[i];\n    const doc = transaction.doc;\n    const store = doc.store;\n    const ds = transaction.deleteSet;\n    const mergeStructs = transaction._mergeStructs;\n    try {\n      sortAndMergeDeleteSet(ds);\n      transaction.afterState = getStateVector(transaction.doc.store);\n      doc.emit('beforeObserverCalls', [transaction, doc]);\n      /**\n       * An array of event callbacks.\n       *\n       * Each callback is called even if the other ones throw errors.\n       *\n       * @type {Array<function():void>}\n       */\n      const fs = [];\n      // observe events on changed types\n      transaction.changed.forEach((subs, itemtype) =>\n        fs.push(() => {\n          if (itemtype._item === null || !itemtype._item.deleted) {\n            itemtype._callObserver(transaction, subs);\n          }\n        })\n      );\n      fs.push(() => {\n        // deep observe events\n        transaction.changedParentTypes.forEach((events, type) => {\n          // We need to think about the possibility that the user transforms the\n          // Y.Doc in the event.\n          if (type._dEH.l.length > 0 && (type._item === null || !type._item.deleted)) {\n            events = events\n              .filter(event =>\n                event.target._item === null || !event.target._item.deleted\n              );\n            events\n              .forEach(event => {\n                event.currentTarget = type;\n                // path is relative to the current target\n                event._path = null;\n              });\n            // sort events by path length so that top-level events are fired first.\n            events\n              .sort((event1, event2) => event1.path.length - event2.path.length);\n            // We don't need to check for events.length\n            // because we know it has at least one element\n            callEventHandlerListeners(type._dEH, events, transaction);\n          }\n        });\n      });\n      fs.push(() => doc.emit('afterTransaction', [transaction, doc]));\n      callAll(fs, []);\n      if (transaction._needFormattingCleanup) {\n        cleanupYTextAfterTransaction(transaction);\n      }\n    } finally {\n      // Replace deleted items with ItemDeleted / GC.\n      // This is where content is actually remove from the Yjs Doc.\n      if (doc.gc) {\n        tryGcDeleteSet(ds, store, doc.gcFilter);\n      }\n      tryMergeDeleteSet(ds, store);\n\n      // on all affected store.clients props, try to merge\n      transaction.afterState.forEach((clock, client) => {\n        const beforeClock = transaction.beforeState.get(client) || 0;\n        if (beforeClock !== clock) {\n          const structs = /** @type {Array<GC|Item>} */ (store.clients.get(client));\n          // we iterate from right to left so we can safely remove entries\n          const firstChangePos = math.max(findIndexSS(structs, beforeClock), 1);\n          for (let i = structs.length - 1; i >= firstChangePos;) {\n            i -= 1 + tryToMergeWithLefts(structs, i);\n          }\n        }\n      });\n      // try to merge mergeStructs\n      // @todo: it makes more sense to transform mergeStructs to a DS, sort it, and merge from right to left\n      //        but at the moment DS does not handle duplicates\n      for (let i = mergeStructs.length - 1; i >= 0; i--) {\n        const { client, clock } = mergeStructs[i].id;\n        const structs = /** @type {Array<GC|Item>} */ (store.clients.get(client));\n        const replacedStructPos = findIndexSS(structs, clock);\n        if (replacedStructPos + 1 < structs.length) {\n          if (tryToMergeWithLefts(structs, replacedStructPos + 1) > 1) {\n            continue // no need to perform next check, both are already merged\n          }\n        }\n        if (replacedStructPos > 0) {\n          tryToMergeWithLefts(structs, replacedStructPos);\n        }\n      }\n      if (!transaction.local && transaction.afterState.get(doc.clientID) !== transaction.beforeState.get(doc.clientID)) {\n        logging.print(logging.ORANGE, logging.BOLD, '[yjs] ', logging.UNBOLD, logging.RED, 'Changed the client-id because another client seems to be using it.');\n        doc.clientID = generateNewClientId();\n      }\n      // @todo Merge all the transactions into one and provide send the data as a single update message\n      doc.emit('afterTransactionCleanup', [transaction, doc]);\n      if (doc._observers.has('update')) {\n        const encoder = new UpdateEncoderV1();\n        const hasContent = writeUpdateMessageFromTransaction(encoder, transaction);\n        if (hasContent) {\n          doc.emit('update', [encoder.toUint8Array(), transaction.origin, doc, transaction]);\n        }\n      }\n      if (doc._observers.has('updateV2')) {\n        const encoder = new UpdateEncoderV2();\n        const hasContent = writeUpdateMessageFromTransaction(encoder, transaction);\n        if (hasContent) {\n          doc.emit('updateV2', [encoder.toUint8Array(), transaction.origin, doc, transaction]);\n        }\n      }\n      const { subdocsAdded, subdocsLoaded, subdocsRemoved } = transaction;\n      if (subdocsAdded.size > 0 || subdocsRemoved.size > 0 || subdocsLoaded.size > 0) {\n        subdocsAdded.forEach(subdoc => {\n          subdoc.clientID = doc.clientID;\n          if (subdoc.collectionid == null) {\n            subdoc.collectionid = doc.collectionid;\n          }\n          doc.subdocs.add(subdoc);\n        });\n        subdocsRemoved.forEach(subdoc => doc.subdocs.delete(subdoc));\n        doc.emit('subdocs', [{ loaded: subdocsLoaded, added: subdocsAdded, removed: subdocsRemoved }, doc, transaction]);\n        subdocsRemoved.forEach(subdoc => subdoc.destroy());\n      }\n\n      if (transactionCleanups.length <= i + 1) {\n        doc._transactionCleanups = [];\n        doc.emit('afterAllTransactions', [doc, transactionCleanups]);\n      } else {\n        cleanupTransactions(transactionCleanups, i + 1);\n      }\n    }\n  }\n};\n\n/**\n * Implements the functionality of `y.transact(()=>{..})`\n *\n * @template T\n * @param {Doc} doc\n * @param {function(Transaction):T} f\n * @param {any} [origin=true]\n * @return {T}\n *\n * @function\n */\nconst transact = (doc, f, origin = null, local = true) => {\n  const transactionCleanups = doc._transactionCleanups;\n  let initialCall = false;\n  /**\n   * @type {any}\n   */\n  let result = null;\n  if (doc._transaction === null) {\n    initialCall = true;\n    doc._transaction = new Transaction(doc, origin, local);\n    transactionCleanups.push(doc._transaction);\n    if (transactionCleanups.length === 1) {\n      doc.emit('beforeAllTransactions', [doc]);\n    }\n    doc.emit('beforeTransaction', [doc._transaction, doc]);\n  }\n  try {\n    result = f(doc._transaction);\n  } finally {\n    if (initialCall) {\n      const finishCleanup = doc._transaction === transactionCleanups[0];\n      doc._transaction = null;\n      if (finishCleanup) {\n        // The first transaction ended, now process observer calls.\n        // Observer call may create new transactions for which we need to call the observers and do cleanup.\n        // We don't want to nest these calls, so we execute these calls one after\n        // another.\n        // Also we need to ensure that all cleanups are called, even if the\n        // observes throw errors.\n        // This file is full of hacky try {} finally {} blocks to ensure that an\n        // event can throw errors and also that the cleanup is called.\n        cleanupTransactions(transactionCleanups, 0);\n      }\n    }\n  }\n  return result\n};\n\nclass StackItem {\n  /**\n   * @param {DeleteSet} deletions\n   * @param {DeleteSet} insertions\n   */\n  constructor (deletions, insertions) {\n    this.insertions = insertions;\n    this.deletions = deletions;\n    /**\n     * Use this to save and restore metadata like selection range\n     */\n    this.meta = new Map();\n  }\n}\n/**\n * @param {Transaction} tr\n * @param {UndoManager} um\n * @param {StackItem} stackItem\n */\nconst clearUndoManagerStackItem = (tr, um, stackItem) => {\n  iterateDeletedStructs(tr, stackItem.deletions, item => {\n    if (item instanceof Item && um.scope.some(type => isParentOf(type, item))) {\n      keepItem(item, false);\n    }\n  });\n};\n\n/**\n * @param {UndoManager} undoManager\n * @param {Array<StackItem>} stack\n * @param {'undo'|'redo'} eventType\n * @return {StackItem?}\n */\nconst popStackItem = (undoManager, stack, eventType) => {\n  /**\n   * Keep a reference to the transaction so we can fire the event with the changedParentTypes\n   * @type {any}\n   */\n  let _tr = null;\n  const doc = undoManager.doc;\n  const scope = undoManager.scope;\n  transact(doc, transaction => {\n    while (stack.length > 0 && undoManager.currStackItem === null) {\n      const store = doc.store;\n      const stackItem = /** @type {StackItem} */ (stack.pop());\n      /**\n       * @type {Set<Item>}\n       */\n      const itemsToRedo = new Set();\n      /**\n       * @type {Array<Item>}\n       */\n      const itemsToDelete = [];\n      let performedChange = false;\n      iterateDeletedStructs(transaction, stackItem.insertions, struct => {\n        if (struct instanceof Item) {\n          if (struct.redone !== null) {\n            let { item, diff } = followRedone(store, struct.id);\n            if (diff > 0) {\n              item = getItemCleanStart(transaction, createID(item.id.client, item.id.clock + diff));\n            }\n            struct = item;\n          }\n          if (!struct.deleted && scope.some(type => isParentOf(type, /** @type {Item} */ (struct)))) {\n            itemsToDelete.push(struct);\n          }\n        }\n      });\n      iterateDeletedStructs(transaction, stackItem.deletions, struct => {\n        if (\n          struct instanceof Item &&\n          scope.some(type => isParentOf(type, struct)) &&\n          // Never redo structs in stackItem.insertions because they were created and deleted in the same capture interval.\n          !isDeleted(stackItem.insertions, struct.id)\n        ) {\n          itemsToRedo.add(struct);\n        }\n      });\n      itemsToRedo.forEach(struct => {\n        performedChange = redoItem(transaction, struct, itemsToRedo, stackItem.insertions, undoManager.ignoreRemoteMapChanges, undoManager) !== null || performedChange;\n      });\n      // We want to delete in reverse order so that children are deleted before\n      // parents, so we have more information available when items are filtered.\n      for (let i = itemsToDelete.length - 1; i >= 0; i--) {\n        const item = itemsToDelete[i];\n        if (undoManager.deleteFilter(item)) {\n          item.delete(transaction);\n          performedChange = true;\n        }\n      }\n      undoManager.currStackItem = performedChange ? stackItem : null;\n    }\n    transaction.changed.forEach((subProps, type) => {\n      // destroy search marker if necessary\n      if (subProps.has(null) && type._searchMarker) {\n        type._searchMarker.length = 0;\n      }\n    });\n    _tr = transaction;\n  }, undoManager);\n  const res = undoManager.currStackItem;\n  if (res != null) {\n    const changedParentTypes = _tr.changedParentTypes;\n    undoManager.emit('stack-item-popped', [{ stackItem: res, type: eventType, changedParentTypes, origin: undoManager }, undoManager]);\n    undoManager.currStackItem = null;\n  }\n  return res\n};\n\n/**\n * @typedef {Object} UndoManagerOptions\n * @property {number} [UndoManagerOptions.captureTimeout=500]\n * @property {function(Transaction):boolean} [UndoManagerOptions.captureTransaction] Do not capture changes of a Transaction if result false.\n * @property {function(Item):boolean} [UndoManagerOptions.deleteFilter=()=>true] Sometimes\n * it is necessary to filter what an Undo/Redo operation can delete. If this\n * filter returns false, the type/item won't be deleted even it is in the\n * undo/redo scope.\n * @property {Set<any>} [UndoManagerOptions.trackedOrigins=new Set([null])]\n * @property {boolean} [ignoreRemoteMapChanges] Experimental. By default, the UndoManager will never overwrite remote changes. Enable this property to enable overwriting remote changes on key-value changes (Y.Map, properties on Y.Xml, etc..).\n * @property {Doc} [doc] The document that this UndoManager operates on. Only needed if typeScope is empty.\n */\n\n/**\n * @typedef {Object} StackItemEvent\n * @property {StackItem} StackItemEvent.stackItem\n * @property {any} StackItemEvent.origin\n * @property {'undo'|'redo'} StackItemEvent.type\n * @property {Map<AbstractType<YEvent<any>>,Array<YEvent<any>>>} StackItemEvent.changedParentTypes\n */\n\n/**\n * Fires 'stack-item-added' event when a stack item was added to either the undo- or\n * the redo-stack. You may store additional stack information via the\n * metadata property on `event.stackItem.meta` (it is a `Map` of metadata properties).\n * Fires 'stack-item-popped' event when a stack item was popped from either the\n * undo- or the redo-stack. You may restore the saved stack information from `event.stackItem.meta`.\n *\n * @extends {ObservableV2<{'stack-item-added':function(StackItemEvent, UndoManager):void, 'stack-item-popped': function(StackItemEvent, UndoManager):void, 'stack-cleared': function({ undoStackCleared: boolean, redoStackCleared: boolean }):void, 'stack-item-updated': function(StackItemEvent, UndoManager):void }>}\n */\nclass UndoManager extends ObservableV2 {\n  /**\n   * @param {AbstractType<any>|Array<AbstractType<any>>} typeScope Accepts either a single type, or an array of types\n   * @param {UndoManagerOptions} options\n   */\n  constructor (typeScope, {\n    captureTimeout = 500,\n    captureTransaction = _tr => true,\n    deleteFilter = () => true,\n    trackedOrigins = new Set([null]),\n    ignoreRemoteMapChanges = false,\n    doc = /** @type {Doc} */ (array.isArray(typeScope) ? typeScope[0].doc : typeScope.doc)\n  } = {}) {\n    super();\n    /**\n     * @type {Array<AbstractType<any>>}\n     */\n    this.scope = [];\n    this.doc = doc;\n    this.addToScope(typeScope);\n    this.deleteFilter = deleteFilter;\n    trackedOrigins.add(this);\n    this.trackedOrigins = trackedOrigins;\n    this.captureTransaction = captureTransaction;\n    /**\n     * @type {Array<StackItem>}\n     */\n    this.undoStack = [];\n    /**\n     * @type {Array<StackItem>}\n     */\n    this.redoStack = [];\n    /**\n     * Whether the client is currently undoing (calling UndoManager.undo)\n     *\n     * @type {boolean}\n     */\n    this.undoing = false;\n    this.redoing = false;\n    /**\n     * The currently popped stack item if UndoManager.undoing or UndoManager.redoing\n     *\n     * @type {StackItem|null}\n     */\n    this.currStackItem = null;\n    this.lastChange = 0;\n    this.ignoreRemoteMapChanges = ignoreRemoteMapChanges;\n    this.captureTimeout = captureTimeout;\n    /**\n     * @param {Transaction} transaction\n     */\n    this.afterTransactionHandler = transaction => {\n      // Only track certain transactions\n      if (\n        !this.captureTransaction(transaction) ||\n        !this.scope.some(type => transaction.changedParentTypes.has(type)) ||\n        (!this.trackedOrigins.has(transaction.origin) && (!transaction.origin || !this.trackedOrigins.has(transaction.origin.constructor)))\n      ) {\n        return\n      }\n      const undoing = this.undoing;\n      const redoing = this.redoing;\n      const stack = undoing ? this.redoStack : this.undoStack;\n      if (undoing) {\n        this.stopCapturing(); // next undo should not be appended to last stack item\n      } else if (!redoing) {\n        // neither undoing nor redoing: delete redoStack\n        this.clear(false, true);\n      }\n      const insertions = new DeleteSet();\n      transaction.afterState.forEach((endClock, client) => {\n        const startClock = transaction.beforeState.get(client) || 0;\n        const len = endClock - startClock;\n        if (len > 0) {\n          addToDeleteSet(insertions, client, startClock, len);\n        }\n      });\n      const now = time.getUnixTime();\n      let didAdd = false;\n      if (this.lastChange > 0 && now - this.lastChange < this.captureTimeout && stack.length > 0 && !undoing && !redoing) {\n        // append change to last stack op\n        const lastOp = stack[stack.length - 1];\n        lastOp.deletions = mergeDeleteSets([lastOp.deletions, transaction.deleteSet]);\n        lastOp.insertions = mergeDeleteSets([lastOp.insertions, insertions]);\n      } else {\n        // create a new stack op\n        stack.push(new StackItem(transaction.deleteSet, insertions));\n        didAdd = true;\n      }\n      if (!undoing && !redoing) {\n        this.lastChange = now;\n      }\n      // make sure that deleted structs are not gc'd\n      iterateDeletedStructs(transaction, transaction.deleteSet, /** @param {Item|GC} item */ item => {\n        if (item instanceof Item && this.scope.some(type => isParentOf(type, item))) {\n          keepItem(item, true);\n        }\n      });\n      /**\n       * @type {[StackItemEvent, UndoManager]}\n       */\n      const changeEvent = [{ stackItem: stack[stack.length - 1], origin: transaction.origin, type: undoing ? 'redo' : 'undo', changedParentTypes: transaction.changedParentTypes }, this];\n      if (didAdd) {\n        this.emit('stack-item-added', changeEvent);\n      } else {\n        this.emit('stack-item-updated', changeEvent);\n      }\n    };\n    this.doc.on('afterTransaction', this.afterTransactionHandler);\n    this.doc.on('destroy', () => {\n      this.destroy();\n    });\n  }\n\n  /**\n   * @param {Array<AbstractType<any>> | AbstractType<any>} ytypes\n   */\n  addToScope (ytypes) {\n    ytypes = array.isArray(ytypes) ? ytypes : [ytypes];\n    ytypes.forEach(ytype => {\n      if (this.scope.every(yt => yt !== ytype)) {\n        if (ytype.doc !== this.doc) logging.warn('[yjs#509] Not same Y.Doc'); // use MultiDocUndoManager instead. also see https://github.com/yjs/yjs/issues/509\n        this.scope.push(ytype);\n      }\n    });\n  }\n\n  /**\n   * @param {any} origin\n   */\n  addTrackedOrigin (origin) {\n    this.trackedOrigins.add(origin);\n  }\n\n  /**\n   * @param {any} origin\n   */\n  removeTrackedOrigin (origin) {\n    this.trackedOrigins.delete(origin);\n  }\n\n  clear (clearUndoStack = true, clearRedoStack = true) {\n    if ((clearUndoStack && this.canUndo()) || (clearRedoStack && this.canRedo())) {\n      this.doc.transact(tr => {\n        if (clearUndoStack) {\n          this.undoStack.forEach(item => clearUndoManagerStackItem(tr, this, item));\n          this.undoStack = [];\n        }\n        if (clearRedoStack) {\n          this.redoStack.forEach(item => clearUndoManagerStackItem(tr, this, item));\n          this.redoStack = [];\n        }\n        this.emit('stack-cleared', [{ undoStackCleared: clearUndoStack, redoStackCleared: clearRedoStack }]);\n      });\n    }\n  }\n\n  /**\n   * UndoManager merges Undo-StackItem if they are created within time-gap\n   * smaller than `options.captureTimeout`. Call `um.stopCapturing()` so that the next\n   * StackItem won't be merged.\n   *\n   *\n   * @example\n   *     // without stopCapturing\n   *     ytext.insert(0, 'a')\n   *     ytext.insert(1, 'b')\n   *     um.undo()\n   *     ytext.toString() // => '' (note that 'ab' was removed)\n   *     // with stopCapturing\n   *     ytext.insert(0, 'a')\n   *     um.stopCapturing()\n   *     ytext.insert(0, 'b')\n   *     um.undo()\n   *     ytext.toString() // => 'a' (note that only 'b' was removed)\n   *\n   */\n  stopCapturing () {\n    this.lastChange = 0;\n  }\n\n  /**\n   * Undo last changes on type.\n   *\n   * @return {StackItem?} Returns StackItem if a change was applied\n   */\n  undo () {\n    this.undoing = true;\n    let res;\n    try {\n      res = popStackItem(this, this.undoStack, 'undo');\n    } finally {\n      this.undoing = false;\n    }\n    return res\n  }\n\n  /**\n   * Redo last undo operation.\n   *\n   * @return {StackItem?} Returns StackItem if a change was applied\n   */\n  redo () {\n    this.redoing = true;\n    let res;\n    try {\n      res = popStackItem(this, this.redoStack, 'redo');\n    } finally {\n      this.redoing = false;\n    }\n    return res\n  }\n\n  /**\n   * Are undo steps available?\n   *\n   * @return {boolean} `true` if undo is possible\n   */\n  canUndo () {\n    return this.undoStack.length > 0\n  }\n\n  /**\n   * Are redo steps available?\n   *\n   * @return {boolean} `true` if redo is possible\n   */\n  canRedo () {\n    return this.redoStack.length > 0\n  }\n\n  destroy () {\n    this.trackedOrigins.delete(this);\n    this.doc.off('afterTransaction', this.afterTransactionHandler);\n    super.destroy();\n  }\n}\n\n/**\n * @param {UpdateDecoderV1 | UpdateDecoderV2} decoder\n */\nfunction * lazyStructReaderGenerator (decoder) {\n  const numOfStateUpdates = decoding.readVarUint(decoder.restDecoder);\n  for (let i = 0; i < numOfStateUpdates; i++) {\n    const numberOfStructs = decoding.readVarUint(decoder.restDecoder);\n    const client = decoder.readClient();\n    let clock = decoding.readVarUint(decoder.restDecoder);\n    for (let i = 0; i < numberOfStructs; i++) {\n      const info = decoder.readInfo();\n      // @todo use switch instead of ifs\n      if (info === 10) {\n        const len = decoding.readVarUint(decoder.restDecoder);\n        yield new Skip(createID(client, clock), len);\n        clock += len;\n      } else if ((binary.BITS5 & info) !== 0) {\n        const cantCopyParentInfo = (info & (binary.BIT7 | binary.BIT8)) === 0;\n        // If parent = null and neither left nor right are defined, then we know that `parent` is child of `y`\n        // and we read the next string as parentYKey.\n        // It indicates how we store/retrieve parent from `y.share`\n        // @type {string|null}\n        const struct = new Item(\n          createID(client, clock),\n          null, // left\n          (info & binary.BIT8) === binary.BIT8 ? decoder.readLeftID() : null, // origin\n          null, // right\n          (info & binary.BIT7) === binary.BIT7 ? decoder.readRightID() : null, // right origin\n          // @ts-ignore Force writing a string here.\n          cantCopyParentInfo ? (decoder.readParentInfo() ? decoder.readString() : decoder.readLeftID()) : null, // parent\n          cantCopyParentInfo && (info & binary.BIT6) === binary.BIT6 ? decoder.readString() : null, // parentSub\n          readItemContent(decoder, info) // item content\n        );\n        yield struct;\n        clock += struct.length;\n      } else {\n        const len = decoder.readLen();\n        yield new GC(createID(client, clock), len);\n        clock += len;\n      }\n    }\n  }\n}\n\nclass LazyStructReader {\n  /**\n   * @param {UpdateDecoderV1 | UpdateDecoderV2} decoder\n   * @param {boolean} filterSkips\n   */\n  constructor (decoder, filterSkips) {\n    this.gen = lazyStructReaderGenerator(decoder);\n    /**\n     * @type {null | Item | Skip | GC}\n     */\n    this.curr = null;\n    this.done = false;\n    this.filterSkips = filterSkips;\n    this.next();\n  }\n\n  /**\n   * @return {Item | GC | Skip |null}\n   */\n  next () {\n    // ignore \"Skip\" structs\n    do {\n      this.curr = this.gen.next().value || null;\n    } while (this.filterSkips && this.curr !== null && this.curr.constructor === Skip)\n    return this.curr\n  }\n}\n\n/**\n * @param {Uint8Array} update\n *\n */\nconst logUpdate = update => logUpdateV2(update, UpdateDecoderV1);\n\n/**\n * @param {Uint8Array} update\n * @param {typeof UpdateDecoderV2 | typeof UpdateDecoderV1} [YDecoder]\n *\n */\nconst logUpdateV2 = (update, YDecoder = UpdateDecoderV2) => {\n  const structs = [];\n  const updateDecoder = new YDecoder(decoding.createDecoder(update));\n  const lazyDecoder = new LazyStructReader(updateDecoder, false);\n  for (let curr = lazyDecoder.curr; curr !== null; curr = lazyDecoder.next()) {\n    structs.push(curr);\n  }\n  logging.print('Structs: ', structs);\n  const ds = readDeleteSet(updateDecoder);\n  logging.print('DeleteSet: ', ds);\n};\n\n/**\n * @param {Uint8Array} update\n *\n */\nconst decodeUpdate = (update) => decodeUpdateV2(update, UpdateDecoderV1);\n\n/**\n * @param {Uint8Array} update\n * @param {typeof UpdateDecoderV2 | typeof UpdateDecoderV1} [YDecoder]\n *\n */\nconst decodeUpdateV2 = (update, YDecoder = UpdateDecoderV2) => {\n  const structs = [];\n  const updateDecoder = new YDecoder(decoding.createDecoder(update));\n  const lazyDecoder = new LazyStructReader(updateDecoder, false);\n  for (let curr = lazyDecoder.curr; curr !== null; curr = lazyDecoder.next()) {\n    structs.push(curr);\n  }\n  return {\n    structs,\n    ds: readDeleteSet(updateDecoder)\n  }\n};\n\nclass LazyStructWriter {\n  /**\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n   */\n  constructor (encoder) {\n    this.currClient = 0;\n    this.startClock = 0;\n    this.written = 0;\n    this.encoder = encoder;\n    /**\n     * We want to write operations lazily, but also we need to know beforehand how many operations we want to write for each client.\n     *\n     * This kind of meta-information (#clients, #structs-per-client-written) is written to the restEncoder.\n     *\n     * We fragment the restEncoder and store a slice of it per-client until we know how many clients there are.\n     * When we flush (toUint8Array) we write the restEncoder using the fragments and the meta-information.\n     *\n     * @type {Array<{ written: number, restEncoder: Uint8Array }>}\n     */\n    this.clientStructs = [];\n  }\n}\n\n/**\n * @param {Array<Uint8Array>} updates\n * @return {Uint8Array}\n */\nconst mergeUpdates = updates => mergeUpdatesV2(updates, UpdateDecoderV1, UpdateEncoderV1);\n\n/**\n * @param {Uint8Array} update\n * @param {typeof DSEncoderV1 | typeof DSEncoderV2} YEncoder\n * @param {typeof UpdateDecoderV1 | typeof UpdateDecoderV2} YDecoder\n * @return {Uint8Array}\n */\nconst encodeStateVectorFromUpdateV2 = (update, YEncoder = DSEncoderV2, YDecoder = UpdateDecoderV2) => {\n  const encoder = new YEncoder();\n  const updateDecoder = new LazyStructReader(new YDecoder(decoding.createDecoder(update)), false);\n  let curr = updateDecoder.curr;\n  if (curr !== null) {\n    let size = 0;\n    let currClient = curr.id.client;\n    let stopCounting = curr.id.clock !== 0; // must start at 0\n    let currClock = stopCounting ? 0 : curr.id.clock + curr.length;\n    for (; curr !== null; curr = updateDecoder.next()) {\n      if (currClient !== curr.id.client) {\n        if (currClock !== 0) {\n          size++;\n          // We found a new client\n          // write what we have to the encoder\n          encoding.writeVarUint(encoder.restEncoder, currClient);\n          encoding.writeVarUint(encoder.restEncoder, currClock);\n        }\n        currClient = curr.id.client;\n        currClock = 0;\n        stopCounting = curr.id.clock !== 0;\n      }\n      // we ignore skips\n      if (curr.constructor === Skip) {\n        stopCounting = true;\n      }\n      if (!stopCounting) {\n        currClock = curr.id.clock + curr.length;\n      }\n    }\n    // write what we have\n    if (currClock !== 0) {\n      size++;\n      encoding.writeVarUint(encoder.restEncoder, currClient);\n      encoding.writeVarUint(encoder.restEncoder, currClock);\n    }\n    // prepend the size of the state vector\n    const enc = encoding.createEncoder();\n    encoding.writeVarUint(enc, size);\n    encoding.writeBinaryEncoder(enc, encoder.restEncoder);\n    encoder.restEncoder = enc;\n    return encoder.toUint8Array()\n  } else {\n    encoding.writeVarUint(encoder.restEncoder, 0);\n    return encoder.toUint8Array()\n  }\n};\n\n/**\n * @param {Uint8Array} update\n * @return {Uint8Array}\n */\nconst encodeStateVectorFromUpdate = update => encodeStateVectorFromUpdateV2(update, DSEncoderV1, UpdateDecoderV1);\n\n/**\n * @param {Uint8Array} update\n * @param {typeof UpdateDecoderV1 | typeof UpdateDecoderV2} YDecoder\n * @return {{ from: Map<number,number>, to: Map<number,number> }}\n */\nconst parseUpdateMetaV2 = (update, YDecoder = UpdateDecoderV2) => {\n  /**\n   * @type {Map<number, number>}\n   */\n  const from = new Map();\n  /**\n   * @type {Map<number, number>}\n   */\n  const to = new Map();\n  const updateDecoder = new LazyStructReader(new YDecoder(decoding.createDecoder(update)), false);\n  let curr = updateDecoder.curr;\n  if (curr !== null) {\n    let currClient = curr.id.client;\n    let currClock = curr.id.clock;\n    // write the beginning to `from`\n    from.set(currClient, currClock);\n    for (; curr !== null; curr = updateDecoder.next()) {\n      if (currClient !== curr.id.client) {\n        // We found a new client\n        // write the end to `to`\n        to.set(currClient, currClock);\n        // write the beginning to `from`\n        from.set(curr.id.client, curr.id.clock);\n        // update currClient\n        currClient = curr.id.client;\n      }\n      currClock = curr.id.clock + curr.length;\n    }\n    // write the end to `to`\n    to.set(currClient, currClock);\n  }\n  return { from, to }\n};\n\n/**\n * @param {Uint8Array} update\n * @return {{ from: Map<number,number>, to: Map<number,number> }}\n */\nconst parseUpdateMeta = update => parseUpdateMetaV2(update, UpdateDecoderV1);\n\n/**\n * This method is intended to slice any kind of struct and retrieve the right part.\n * It does not handle side-effects, so it should only be used by the lazy-encoder.\n *\n * @param {Item | GC | Skip} left\n * @param {number} diff\n * @return {Item | GC}\n */\nconst sliceStruct = (left, diff) => {\n  if (left.constructor === GC) {\n    const { client, clock } = left.id;\n    return new GC(createID(client, clock + diff), left.length - diff)\n  } else if (left.constructor === Skip) {\n    const { client, clock } = left.id;\n    return new Skip(createID(client, clock + diff), left.length - diff)\n  } else {\n    const leftItem = /** @type {Item} */ (left);\n    const { client, clock } = leftItem.id;\n    return new Item(\n      createID(client, clock + diff),\n      null,\n      createID(client, clock + diff - 1),\n      null,\n      leftItem.rightOrigin,\n      leftItem.parent,\n      leftItem.parentSub,\n      leftItem.content.splice(diff)\n    )\n  }\n};\n\n/**\n *\n * This function works similarly to `readUpdateV2`.\n *\n * @param {Array<Uint8Array>} updates\n * @param {typeof UpdateDecoderV1 | typeof UpdateDecoderV2} [YDecoder]\n * @param {typeof UpdateEncoderV1 | typeof UpdateEncoderV2} [YEncoder]\n * @return {Uint8Array}\n */\nconst mergeUpdatesV2 = (updates, YDecoder = UpdateDecoderV2, YEncoder = UpdateEncoderV2) => {\n  if (updates.length === 1) {\n    return updates[0]\n  }\n  const updateDecoders = updates.map(update => new YDecoder(decoding.createDecoder(update)));\n  let lazyStructDecoders = updateDecoders.map(decoder => new LazyStructReader(decoder, true));\n\n  /**\n   * @todo we don't need offset because we always slice before\n   * @type {null | { struct: Item | GC | Skip, offset: number }}\n   */\n  let currWrite = null;\n\n  const updateEncoder = new YEncoder();\n  // write structs lazily\n  const lazyStructEncoder = new LazyStructWriter(updateEncoder);\n\n  // Note: We need to ensure that all lazyStructDecoders are fully consumed\n  // Note: Should merge document updates whenever possible - even from different updates\n  // Note: Should handle that some operations cannot be applied yet ()\n\n  while (true) {\n    // Write higher clients first ⇒ sort by clientID & clock and remove decoders without content\n    lazyStructDecoders = lazyStructDecoders.filter(dec => dec.curr !== null);\n    lazyStructDecoders.sort(\n      /** @type {function(any,any):number} */ (dec1, dec2) => {\n        if (dec1.curr.id.client === dec2.curr.id.client) {\n          const clockDiff = dec1.curr.id.clock - dec2.curr.id.clock;\n          if (clockDiff === 0) {\n            // @todo remove references to skip since the structDecoders must filter Skips.\n            return dec1.curr.constructor === dec2.curr.constructor\n              ? 0\n              : dec1.curr.constructor === Skip ? 1 : -1 // we are filtering skips anyway.\n          } else {\n            return clockDiff\n          }\n        } else {\n          return dec2.curr.id.client - dec1.curr.id.client\n        }\n      }\n    );\n    if (lazyStructDecoders.length === 0) {\n      break\n    }\n    const currDecoder = lazyStructDecoders[0];\n    // write from currDecoder until the next operation is from another client or if filler-struct\n    // then we need to reorder the decoders and find the next operation to write\n    const firstClient = /** @type {Item | GC} */ (currDecoder.curr).id.client;\n\n    if (currWrite !== null) {\n      let curr = /** @type {Item | GC | null} */ (currDecoder.curr);\n      let iterated = false;\n\n      // iterate until we find something that we haven't written already\n      // remember: first the high client-ids are written\n      while (curr !== null && curr.id.clock + curr.length <= currWrite.struct.id.clock + currWrite.struct.length && curr.id.client >= currWrite.struct.id.client) {\n        curr = currDecoder.next();\n        iterated = true;\n      }\n      if (\n        curr === null || // current decoder is empty\n        curr.id.client !== firstClient || // check whether there is another decoder that has has updates from `firstClient`\n        (iterated && curr.id.clock > currWrite.struct.id.clock + currWrite.struct.length) // the above while loop was used and we are potentially missing updates\n      ) {\n        continue\n      }\n\n      if (firstClient !== currWrite.struct.id.client) {\n        writeStructToLazyStructWriter(lazyStructEncoder, currWrite.struct, currWrite.offset);\n        currWrite = { struct: curr, offset: 0 };\n        currDecoder.next();\n      } else {\n        if (currWrite.struct.id.clock + currWrite.struct.length < curr.id.clock) {\n          // @todo write currStruct & set currStruct = Skip(clock = currStruct.id.clock + currStruct.length, length = curr.id.clock - self.clock)\n          if (currWrite.struct.constructor === Skip) {\n            // extend existing skip\n            currWrite.struct.length = curr.id.clock + curr.length - currWrite.struct.id.clock;\n          } else {\n            writeStructToLazyStructWriter(lazyStructEncoder, currWrite.struct, currWrite.offset);\n            const diff = curr.id.clock - currWrite.struct.id.clock - currWrite.struct.length;\n            /**\n             * @type {Skip}\n             */\n            const struct = new Skip(createID(firstClient, currWrite.struct.id.clock + currWrite.struct.length), diff);\n            currWrite = { struct, offset: 0 };\n          }\n        } else { // if (currWrite.struct.id.clock + currWrite.struct.length >= curr.id.clock) {\n          const diff = currWrite.struct.id.clock + currWrite.struct.length - curr.id.clock;\n          if (diff > 0) {\n            if (currWrite.struct.constructor === Skip) {\n              // prefer to slice Skip because the other struct might contain more information\n              currWrite.struct.length -= diff;\n            } else {\n              curr = sliceStruct(curr, diff);\n            }\n          }\n          if (!currWrite.struct.mergeWith(/** @type {any} */ (curr))) {\n            writeStructToLazyStructWriter(lazyStructEncoder, currWrite.struct, currWrite.offset);\n            currWrite = { struct: curr, offset: 0 };\n            currDecoder.next();\n          }\n        }\n      }\n    } else {\n      currWrite = { struct: /** @type {Item | GC} */ (currDecoder.curr), offset: 0 };\n      currDecoder.next();\n    }\n    for (\n      let next = currDecoder.curr;\n      next !== null && next.id.client === firstClient && next.id.clock === currWrite.struct.id.clock + currWrite.struct.length && next.constructor !== Skip;\n      next = currDecoder.next()\n    ) {\n      writeStructToLazyStructWriter(lazyStructEncoder, currWrite.struct, currWrite.offset);\n      currWrite = { struct: next, offset: 0 };\n    }\n  }\n  if (currWrite !== null) {\n    writeStructToLazyStructWriter(lazyStructEncoder, currWrite.struct, currWrite.offset);\n    currWrite = null;\n  }\n  finishLazyStructWriting(lazyStructEncoder);\n\n  const dss = updateDecoders.map(decoder => readDeleteSet(decoder));\n  const ds = mergeDeleteSets(dss);\n  writeDeleteSet(updateEncoder, ds);\n  return updateEncoder.toUint8Array()\n};\n\n/**\n * @param {Uint8Array} update\n * @param {Uint8Array} sv\n * @param {typeof UpdateDecoderV1 | typeof UpdateDecoderV2} [YDecoder]\n * @param {typeof UpdateEncoderV1 | typeof UpdateEncoderV2} [YEncoder]\n */\nconst diffUpdateV2 = (update, sv, YDecoder = UpdateDecoderV2, YEncoder = UpdateEncoderV2) => {\n  const state = decodeStateVector(sv);\n  const encoder = new YEncoder();\n  const lazyStructWriter = new LazyStructWriter(encoder);\n  const decoder = new YDecoder(decoding.createDecoder(update));\n  const reader = new LazyStructReader(decoder, false);\n  while (reader.curr) {\n    const curr = reader.curr;\n    const currClient = curr.id.client;\n    const svClock = state.get(currClient) || 0;\n    if (reader.curr.constructor === Skip) {\n      // the first written struct shouldn't be a skip\n      reader.next();\n      continue\n    }\n    if (curr.id.clock + curr.length > svClock) {\n      writeStructToLazyStructWriter(lazyStructWriter, curr, math.max(svClock - curr.id.clock, 0));\n      reader.next();\n      while (reader.curr && reader.curr.id.client === currClient) {\n        writeStructToLazyStructWriter(lazyStructWriter, reader.curr, 0);\n        reader.next();\n      }\n    } else {\n      // read until something new comes up\n      while (reader.curr && reader.curr.id.client === currClient && reader.curr.id.clock + reader.curr.length <= svClock) {\n        reader.next();\n      }\n    }\n  }\n  finishLazyStructWriting(lazyStructWriter);\n  // write ds\n  const ds = readDeleteSet(decoder);\n  writeDeleteSet(encoder, ds);\n  return encoder.toUint8Array()\n};\n\n/**\n * @param {Uint8Array} update\n * @param {Uint8Array} sv\n */\nconst diffUpdate = (update, sv) => diffUpdateV2(update, sv, UpdateDecoderV1, UpdateEncoderV1);\n\n/**\n * @param {LazyStructWriter} lazyWriter\n */\nconst flushLazyStructWriter = lazyWriter => {\n  if (lazyWriter.written > 0) {\n    lazyWriter.clientStructs.push({ written: lazyWriter.written, restEncoder: encoding.toUint8Array(lazyWriter.encoder.restEncoder) });\n    lazyWriter.encoder.restEncoder = encoding.createEncoder();\n    lazyWriter.written = 0;\n  }\n};\n\n/**\n * @param {LazyStructWriter} lazyWriter\n * @param {Item | GC} struct\n * @param {number} offset\n */\nconst writeStructToLazyStructWriter = (lazyWriter, struct, offset) => {\n  // flush curr if we start another client\n  if (lazyWriter.written > 0 && lazyWriter.currClient !== struct.id.client) {\n    flushLazyStructWriter(lazyWriter);\n  }\n  if (lazyWriter.written === 0) {\n    lazyWriter.currClient = struct.id.client;\n    // write next client\n    lazyWriter.encoder.writeClient(struct.id.client);\n    // write startClock\n    encoding.writeVarUint(lazyWriter.encoder.restEncoder, struct.id.clock + offset);\n  }\n  struct.write(lazyWriter.encoder, offset);\n  lazyWriter.written++;\n};\n/**\n * Call this function when we collected all parts and want to\n * put all the parts together. After calling this method,\n * you can continue using the UpdateEncoder.\n *\n * @param {LazyStructWriter} lazyWriter\n */\nconst finishLazyStructWriting = (lazyWriter) => {\n  flushLazyStructWriter(lazyWriter);\n\n  // this is a fresh encoder because we called flushCurr\n  const restEncoder = lazyWriter.encoder.restEncoder;\n\n  /**\n   * Now we put all the fragments together.\n   * This works similarly to `writeClientsStructs`\n   */\n\n  // write # states that were updated - i.e. the clients\n  encoding.writeVarUint(restEncoder, lazyWriter.clientStructs.length);\n\n  for (let i = 0; i < lazyWriter.clientStructs.length; i++) {\n    const partStructs = lazyWriter.clientStructs[i];\n    /**\n     * Works similarly to `writeStructs`\n     */\n    // write # encoded structs\n    encoding.writeVarUint(restEncoder, partStructs.written);\n    // write the rest of the fragment\n    encoding.writeUint8Array(restEncoder, partStructs.restEncoder);\n  }\n};\n\n/**\n * @param {Uint8Array} update\n * @param {function(Item|GC|Skip):Item|GC|Skip} blockTransformer\n * @param {typeof UpdateDecoderV2 | typeof UpdateDecoderV1} YDecoder\n * @param {typeof UpdateEncoderV2 | typeof UpdateEncoderV1 } YEncoder\n */\nconst convertUpdateFormat = (update, blockTransformer, YDecoder, YEncoder) => {\n  const updateDecoder = new YDecoder(decoding.createDecoder(update));\n  const lazyDecoder = new LazyStructReader(updateDecoder, false);\n  const updateEncoder = new YEncoder();\n  const lazyWriter = new LazyStructWriter(updateEncoder);\n  for (let curr = lazyDecoder.curr; curr !== null; curr = lazyDecoder.next()) {\n    writeStructToLazyStructWriter(lazyWriter, blockTransformer(curr), 0);\n  }\n  finishLazyStructWriting(lazyWriter);\n  const ds = readDeleteSet(updateDecoder);\n  writeDeleteSet(updateEncoder, ds);\n  return updateEncoder.toUint8Array()\n};\n\n/**\n * @typedef {Object} ObfuscatorOptions\n * @property {boolean} [ObfuscatorOptions.formatting=true]\n * @property {boolean} [ObfuscatorOptions.subdocs=true]\n * @property {boolean} [ObfuscatorOptions.yxml=true] Whether to obfuscate nodeName / hookName\n */\n\n/**\n * @param {ObfuscatorOptions} obfuscator\n */\nconst createObfuscator = ({ formatting = true, subdocs = true, yxml = true } = {}) => {\n  let i = 0;\n  const mapKeyCache = map.create();\n  const nodeNameCache = map.create();\n  const formattingKeyCache = map.create();\n  const formattingValueCache = map.create();\n  formattingValueCache.set(null, null); // end of a formatting range should always be the end of a formatting range\n  /**\n   * @param {Item|GC|Skip} block\n   * @return {Item|GC|Skip}\n   */\n  return block => {\n    switch (block.constructor) {\n      case GC:\n      case Skip:\n        return block\n      case Item: {\n        const item = /** @type {Item} */ (block);\n        const content = item.content;\n        switch (content.constructor) {\n          case ContentDeleted:\n            break\n          case ContentType: {\n            if (yxml) {\n              const type = /** @type {ContentType} */ (content).type;\n              if (type instanceof YXmlElement) {\n                type.nodeName = map.setIfUndefined(nodeNameCache, type.nodeName, () => 'node-' + i);\n              }\n              if (type instanceof YXmlHook) {\n                type.hookName = map.setIfUndefined(nodeNameCache, type.hookName, () => 'hook-' + i);\n              }\n            }\n            break\n          }\n          case ContentAny: {\n            const c = /** @type {ContentAny} */ (content);\n            c.arr = c.arr.map(() => i);\n            break\n          }\n          case ContentBinary: {\n            const c = /** @type {ContentBinary} */ (content);\n            c.content = new Uint8Array([i]);\n            break\n          }\n          case ContentDoc: {\n            const c = /** @type {ContentDoc} */ (content);\n            if (subdocs) {\n              c.opts = {};\n              c.doc.guid = i + '';\n            }\n            break\n          }\n          case ContentEmbed: {\n            const c = /** @type {ContentEmbed} */ (content);\n            c.embed = {};\n            break\n          }\n          case ContentFormat: {\n            const c = /** @type {ContentFormat} */ (content);\n            if (formatting) {\n              c.key = map.setIfUndefined(formattingKeyCache, c.key, () => i + '');\n              c.value = map.setIfUndefined(formattingValueCache, c.value, () => ({ i }));\n            }\n            break\n          }\n          case ContentJSON: {\n            const c = /** @type {ContentJSON} */ (content);\n            c.arr = c.arr.map(() => i);\n            break\n          }\n          case ContentString: {\n            const c = /** @type {ContentString} */ (content);\n            c.str = string.repeat((i % 10) + '', c.str.length);\n            break\n          }\n          default:\n            // unknown content type\n            error.unexpectedCase();\n        }\n        if (item.parentSub) {\n          item.parentSub = map.setIfUndefined(mapKeyCache, item.parentSub, () => i + '');\n        }\n        i++;\n        return block\n      }\n      default:\n        // unknown block-type\n        error.unexpectedCase();\n    }\n  }\n};\n\n/**\n * This function obfuscates the content of a Yjs update. This is useful to share\n * buggy Yjs documents while significantly limiting the possibility that a\n * developer can on the user. Note that it might still be possible to deduce\n * some information by analyzing the \"structure\" of the document or by analyzing\n * the typing behavior using the CRDT-related metadata that is still kept fully\n * intact.\n *\n * @param {Uint8Array} update\n * @param {ObfuscatorOptions} [opts]\n */\nconst obfuscateUpdate = (update, opts) => convertUpdateFormat(update, createObfuscator(opts), UpdateDecoderV1, UpdateEncoderV1);\n\n/**\n * @param {Uint8Array} update\n * @param {ObfuscatorOptions} [opts]\n */\nconst obfuscateUpdateV2 = (update, opts) => convertUpdateFormat(update, createObfuscator(opts), UpdateDecoderV2, UpdateEncoderV2);\n\n/**\n * @param {Uint8Array} update\n */\nconst convertUpdateFormatV1ToV2 = update => convertUpdateFormat(update, f.id, UpdateDecoderV1, UpdateEncoderV2);\n\n/**\n * @param {Uint8Array} update\n */\nconst convertUpdateFormatV2ToV1 = update => convertUpdateFormat(update, f.id, UpdateDecoderV2, UpdateEncoderV1);\n\nconst errorComputeChanges = 'You must not compute changes after the event-handler fired.';\n\n/**\n * @template {AbstractType<any>} T\n * YEvent describes the changes on a YType.\n */\nclass YEvent {\n  /**\n   * @param {T} target The changed type.\n   * @param {Transaction} transaction\n   */\n  constructor (target, transaction) {\n    /**\n     * The type on which this event was created on.\n     * @type {T}\n     */\n    this.target = target;\n    /**\n     * The current target on which the observe callback is called.\n     * @type {AbstractType<any>}\n     */\n    this.currentTarget = target;\n    /**\n     * The transaction that triggered this event.\n     * @type {Transaction}\n     */\n    this.transaction = transaction;\n    /**\n     * @type {Object|null}\n     */\n    this._changes = null;\n    /**\n     * @type {null | Map<string, { action: 'add' | 'update' | 'delete', oldValue: any, newValue: any }>}\n     */\n    this._keys = null;\n    /**\n     * @type {null | Array<{ insert?: string | Array<any> | object | AbstractType<any>, retain?: number, delete?: number, attributes?: Object<string, any> }>}\n     */\n    this._delta = null;\n    /**\n     * @type {Array<string|number>|null}\n     */\n    this._path = null;\n  }\n\n  /**\n   * Computes the path from `y` to the changed type.\n   *\n   * @todo v14 should standardize on path: Array<{parent, index}> because that is easier to work with.\n   *\n   * The following property holds:\n   * @example\n   *   let type = y\n   *   event.path.forEach(dir => {\n   *     type = type.get(dir)\n   *   })\n   *   type === event.target // => true\n   */\n  get path () {\n    return this._path || (this._path = getPathTo(this.currentTarget, this.target))\n  }\n\n  /**\n   * Check if a struct is deleted by this event.\n   *\n   * In contrast to change.deleted, this method also returns true if the struct was added and then deleted.\n   *\n   * @param {AbstractStruct} struct\n   * @return {boolean}\n   */\n  deletes (struct) {\n    return isDeleted(this.transaction.deleteSet, struct.id)\n  }\n\n  /**\n   * @type {Map<string, { action: 'add' | 'update' | 'delete', oldValue: any, newValue: any }>}\n   */\n  get keys () {\n    if (this._keys === null) {\n      if (this.transaction.doc._transactionCleanups.length === 0) {\n        throw error.create(errorComputeChanges)\n      }\n      const keys = new Map();\n      const target = this.target;\n      const changed = /** @type Set<string|null> */ (this.transaction.changed.get(target));\n      changed.forEach(key => {\n        if (key !== null) {\n          const item = /** @type {Item} */ (target._map.get(key));\n          /**\n           * @type {'delete' | 'add' | 'update'}\n           */\n          let action;\n          let oldValue;\n          if (this.adds(item)) {\n            let prev = item.left;\n            while (prev !== null && this.adds(prev)) {\n              prev = prev.left;\n            }\n            if (this.deletes(item)) {\n              if (prev !== null && this.deletes(prev)) {\n                action = 'delete';\n                oldValue = array.last(prev.content.getContent());\n              } else {\n                return\n              }\n            } else {\n              if (prev !== null && this.deletes(prev)) {\n                action = 'update';\n                oldValue = array.last(prev.content.getContent());\n              } else {\n                action = 'add';\n                oldValue = undefined;\n              }\n            }\n          } else {\n            if (this.deletes(item)) {\n              action = 'delete';\n              oldValue = array.last(/** @type {Item} */ item.content.getContent());\n            } else {\n              return // nop\n            }\n          }\n          keys.set(key, { action, oldValue });\n        }\n      });\n      this._keys = keys;\n    }\n    return this._keys\n  }\n\n  /**\n   * This is a computed property. Note that this can only be safely computed during the\n   * event call. Computing this property after other changes happened might result in\n   * unexpected behavior (incorrect computation of deltas). A safe way to collect changes\n   * is to store the `changes` or the `delta` object. Avoid storing the `transaction` object.\n   *\n   * @type {Array<{insert?: string | Array<any> | object | AbstractType<any>, retain?: number, delete?: number, attributes?: Object<string, any>}>}\n   */\n  get delta () {\n    return this.changes.delta\n  }\n\n  /**\n   * Check if a struct is added by this event.\n   *\n   * In contrast to change.deleted, this method also returns true if the struct was added and then deleted.\n   *\n   * @param {AbstractStruct} struct\n   * @return {boolean}\n   */\n  adds (struct) {\n    return struct.id.clock >= (this.transaction.beforeState.get(struct.id.client) || 0)\n  }\n\n  /**\n   * This is a computed property. Note that this can only be safely computed during the\n   * event call. Computing this property after other changes happened might result in\n   * unexpected behavior (incorrect computation of deltas). A safe way to collect changes\n   * is to store the `changes` or the `delta` object. Avoid storing the `transaction` object.\n   *\n   * @type {{added:Set<Item>,deleted:Set<Item>,keys:Map<string,{action:'add'|'update'|'delete',oldValue:any}>,delta:Array<{insert?:Array<any>|string, delete?:number, retain?:number}>}}\n   */\n  get changes () {\n    let changes = this._changes;\n    if (changes === null) {\n      if (this.transaction.doc._transactionCleanups.length === 0) {\n        throw error.create(errorComputeChanges)\n      }\n      const target = this.target;\n      const added = set.create();\n      const deleted = set.create();\n      /**\n       * @type {Array<{insert:Array<any>}|{delete:number}|{retain:number}>}\n       */\n      const delta = [];\n      changes = {\n        added,\n        deleted,\n        delta,\n        keys: this.keys\n      };\n      const changed = /** @type Set<string|null> */ (this.transaction.changed.get(target));\n      if (changed.has(null)) {\n        /**\n         * @type {any}\n         */\n        let lastOp = null;\n        const packOp = () => {\n          if (lastOp) {\n            delta.push(lastOp);\n          }\n        };\n        for (let item = target._start; item !== null; item = item.right) {\n          if (item.deleted) {\n            if (this.deletes(item) && !this.adds(item)) {\n              if (lastOp === null || lastOp.delete === undefined) {\n                packOp();\n                lastOp = { delete: 0 };\n              }\n              lastOp.delete += item.length;\n              deleted.add(item);\n            } // else nop\n          } else {\n            if (this.adds(item)) {\n              if (lastOp === null || lastOp.insert === undefined) {\n                packOp();\n                lastOp = { insert: [] };\n              }\n              lastOp.insert = lastOp.insert.concat(item.content.getContent());\n              added.add(item);\n            } else {\n              if (lastOp === null || lastOp.retain === undefined) {\n                packOp();\n                lastOp = { retain: 0 };\n              }\n              lastOp.retain += item.length;\n            }\n          }\n        }\n        if (lastOp !== null && lastOp.retain === undefined) {\n          packOp();\n        }\n      }\n      this._changes = changes;\n    }\n    return /** @type {any} */ (changes)\n  }\n}\n\n/**\n * Compute the path from this type to the specified target.\n *\n * @example\n *   // `child` should be accessible via `type.get(path[0]).get(path[1])..`\n *   const path = type.getPathTo(child)\n *   // assuming `type instanceof YArray`\n *   console.log(path) // might look like => [2, 'key1']\n *   child === type.get(path[0]).get(path[1])\n *\n * @param {AbstractType<any>} parent\n * @param {AbstractType<any>} child target\n * @return {Array<string|number>} Path to the target\n *\n * @private\n * @function\n */\nconst getPathTo = (parent, child) => {\n  const path = [];\n  while (child._item !== null && child !== parent) {\n    if (child._item.parentSub !== null) {\n      // parent is map-ish\n      path.unshift(child._item.parentSub);\n    } else {\n      // parent is array-ish\n      let i = 0;\n      let c = /** @type {AbstractType<any>} */ (child._item.parent)._start;\n      while (c !== child._item && c !== null) {\n        if (!c.deleted && c.countable) {\n          i += c.length;\n        }\n        c = c.right;\n      }\n      path.unshift(i);\n    }\n    child = /** @type {AbstractType<any>} */ (child._item.parent);\n  }\n  return path\n};\n\nconst maxSearchMarker = 80;\n\n/**\n * A unique timestamp that identifies each marker.\n *\n * Time is relative,.. this is more like an ever-increasing clock.\n *\n * @type {number}\n */\nlet globalSearchMarkerTimestamp = 0;\n\nclass ArraySearchMarker {\n  /**\n   * @param {Item} p\n   * @param {number} index\n   */\n  constructor (p, index) {\n    p.marker = true;\n    this.p = p;\n    this.index = index;\n    this.timestamp = globalSearchMarkerTimestamp++;\n  }\n}\n\n/**\n * @param {ArraySearchMarker} marker\n */\nconst refreshMarkerTimestamp = marker => { marker.timestamp = globalSearchMarkerTimestamp++; };\n\n/**\n * This is rather complex so this function is the only thing that should overwrite a marker\n *\n * @param {ArraySearchMarker} marker\n * @param {Item} p\n * @param {number} index\n */\nconst overwriteMarker = (marker, p, index) => {\n  marker.p.marker = false;\n  marker.p = p;\n  p.marker = true;\n  marker.index = index;\n  marker.timestamp = globalSearchMarkerTimestamp++;\n};\n\n/**\n * @param {Array<ArraySearchMarker>} searchMarker\n * @param {Item} p\n * @param {number} index\n */\nconst markPosition = (searchMarker, p, index) => {\n  if (searchMarker.length >= maxSearchMarker) {\n    // override oldest marker (we don't want to create more objects)\n    const marker = searchMarker.reduce((a, b) => a.timestamp < b.timestamp ? a : b);\n    overwriteMarker(marker, p, index);\n    return marker\n  } else {\n    // create new marker\n    const pm = new ArraySearchMarker(p, index);\n    searchMarker.push(pm);\n    return pm\n  }\n};\n\n/**\n * Search marker help us to find positions in the associative array faster.\n *\n * They speed up the process of finding a position without much bookkeeping.\n *\n * A maximum of `maxSearchMarker` objects are created.\n *\n * This function always returns a refreshed marker (updated timestamp)\n *\n * @param {AbstractType<any>} yarray\n * @param {number} index\n */\nconst findMarker = (yarray, index) => {\n  if (yarray._start === null || index === 0 || yarray._searchMarker === null) {\n    return null\n  }\n  const marker = yarray._searchMarker.length === 0 ? null : yarray._searchMarker.reduce((a, b) => math.abs(index - a.index) < math.abs(index - b.index) ? a : b);\n  let p = yarray._start;\n  let pindex = 0;\n  if (marker !== null) {\n    p = marker.p;\n    pindex = marker.index;\n    refreshMarkerTimestamp(marker); // we used it, we might need to use it again\n  }\n  // iterate to right if possible\n  while (p.right !== null && pindex < index) {\n    if (!p.deleted && p.countable) {\n      if (index < pindex + p.length) {\n        break\n      }\n      pindex += p.length;\n    }\n    p = p.right;\n  }\n  // iterate to left if necessary (might be that pindex > index)\n  while (p.left !== null && pindex > index) {\n    p = p.left;\n    if (!p.deleted && p.countable) {\n      pindex -= p.length;\n    }\n  }\n  // we want to make sure that p can't be merged with left, because that would screw up everything\n  // in that cas just return what we have (it is most likely the best marker anyway)\n  // iterate to left until p can't be merged with left\n  while (p.left !== null && p.left.id.client === p.id.client && p.left.id.clock + p.left.length === p.id.clock) {\n    p = p.left;\n    if (!p.deleted && p.countable) {\n      pindex -= p.length;\n    }\n  }\n\n  // @todo remove!\n  // assure position\n  // {\n  //   let start = yarray._start\n  //   let pos = 0\n  //   while (start !== p) {\n  //     if (!start.deleted && start.countable) {\n  //       pos += start.length\n  //     }\n  //     start = /** @type {Item} */ (start.right)\n  //   }\n  //   if (pos !== pindex) {\n  //     debugger\n  //     throw new Error('Gotcha position fail!')\n  //   }\n  // }\n  // if (marker) {\n  //   if (window.lengthes == null) {\n  //     window.lengthes = []\n  //     window.getLengthes = () => window.lengthes.sort((a, b) => a - b)\n  //   }\n  //   window.lengthes.push(marker.index - pindex)\n  //   console.log('distance', marker.index - pindex, 'len', p && p.parent.length)\n  // }\n  if (marker !== null && math.abs(marker.index - pindex) < /** @type {YText|YArray<any>} */ (p.parent).length / maxSearchMarker) {\n    // adjust existing marker\n    overwriteMarker(marker, p, pindex);\n    return marker\n  } else {\n    // create new marker\n    return markPosition(yarray._searchMarker, p, pindex)\n  }\n};\n\n/**\n * Update markers when a change happened.\n *\n * This should be called before doing a deletion!\n *\n * @param {Array<ArraySearchMarker>} searchMarker\n * @param {number} index\n * @param {number} len If insertion, len is positive. If deletion, len is negative.\n */\nconst updateMarkerChanges = (searchMarker, index, len) => {\n  for (let i = searchMarker.length - 1; i >= 0; i--) {\n    const m = searchMarker[i];\n    if (len > 0) {\n      /**\n       * @type {Item|null}\n       */\n      let p = m.p;\n      p.marker = false;\n      // Ideally we just want to do a simple position comparison, but this will only work if\n      // search markers don't point to deleted items for formats.\n      // Iterate marker to prev undeleted countable position so we know what to do when updating a position\n      while (p && (p.deleted || !p.countable)) {\n        p = p.left;\n        if (p && !p.deleted && p.countable) {\n          // adjust position. the loop should break now\n          m.index -= p.length;\n        }\n      }\n      if (p === null || p.marker === true) {\n        // remove search marker if updated position is null or if position is already marked\n        searchMarker.splice(i, 1);\n        continue\n      }\n      m.p = p;\n      p.marker = true;\n    }\n    if (index < m.index || (len > 0 && index === m.index)) { // a simple index <= m.index check would actually suffice\n      m.index = math.max(index, m.index + len);\n    }\n  }\n};\n\n/**\n * Accumulate all (list) children of a type and return them as an Array.\n *\n * @param {AbstractType<any>} t\n * @return {Array<Item>}\n */\nconst getTypeChildren = t => {\n  let s = t._start;\n  const arr = [];\n  while (s) {\n    arr.push(s);\n    s = s.right;\n  }\n  return arr\n};\n\n/**\n * Call event listeners with an event. This will also add an event to all\n * parents (for `.observeDeep` handlers).\n *\n * @template EventType\n * @param {AbstractType<EventType>} type\n * @param {Transaction} transaction\n * @param {EventType} event\n */\nconst callTypeObservers = (type, transaction, event) => {\n  const changedType = type;\n  const changedParentTypes = transaction.changedParentTypes;\n  while (true) {\n    // @ts-ignore\n    map.setIfUndefined(changedParentTypes, type, () => []).push(event);\n    if (type._item === null) {\n      break\n    }\n    type = /** @type {AbstractType<any>} */ (type._item.parent);\n  }\n  callEventHandlerListeners(changedType._eH, event, transaction);\n};\n\n/**\n * @template EventType\n * Abstract Yjs Type class\n */\nclass AbstractType {\n  constructor () {\n    /**\n     * @type {Item|null}\n     */\n    this._item = null;\n    /**\n     * @type {Map<string,Item>}\n     */\n    this._map = new Map();\n    /**\n     * @type {Item|null}\n     */\n    this._start = null;\n    /**\n     * @type {Doc|null}\n     */\n    this.doc = null;\n    this._length = 0;\n    /**\n     * Event handlers\n     * @type {EventHandler<EventType,Transaction>}\n     */\n    this._eH = createEventHandler();\n    /**\n     * Deep event handlers\n     * @type {EventHandler<Array<YEvent<any>>,Transaction>}\n     */\n    this._dEH = createEventHandler();\n    /**\n     * @type {null | Array<ArraySearchMarker>}\n     */\n    this._searchMarker = null;\n  }\n\n  /**\n   * @return {AbstractType<any>|null}\n   */\n  get parent () {\n    return this._item ? /** @type {AbstractType<any>} */ (this._item.parent) : null\n  }\n\n  /**\n   * Integrate this type into the Yjs instance.\n   *\n   * * Save this struct in the os\n   * * This type is sent to other client\n   * * Observer functions are fired\n   *\n   * @param {Doc} y The Yjs instance\n   * @param {Item|null} item\n   */\n  _integrate (y, item) {\n    this.doc = y;\n    this._item = item;\n  }\n\n  /**\n   * @return {AbstractType<EventType>}\n   */\n  _copy () {\n    throw error.methodUnimplemented()\n  }\n\n  /**\n   * Makes a copy of this data type that can be included somewhere else.\n   *\n   * Note that the content is only readable _after_ it has been included somewhere in the Ydoc.\n   *\n   * @return {AbstractType<EventType>}\n   */\n  clone () {\n    throw error.methodUnimplemented()\n  }\n\n  /**\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} _encoder\n   */\n  _write (_encoder) { }\n\n  /**\n   * The first non-deleted item\n   */\n  get _first () {\n    let n = this._start;\n    while (n !== null && n.deleted) {\n      n = n.right;\n    }\n    return n\n  }\n\n  /**\n   * Creates YEvent and calls all type observers.\n   * Must be implemented by each type.\n   *\n   * @param {Transaction} transaction\n   * @param {Set<null|string>} _parentSubs Keys changed on this type. `null` if list was modified.\n   */\n  _callObserver (transaction, _parentSubs) {\n    if (!transaction.local && this._searchMarker) {\n      this._searchMarker.length = 0;\n    }\n  }\n\n  /**\n   * Observe all events that are created on this type.\n   *\n   * @param {function(EventType, Transaction):void} f Observer function\n   */\n  observe (f) {\n    addEventHandlerListener(this._eH, f);\n  }\n\n  /**\n   * Observe all events that are created by this type and its children.\n   *\n   * @param {function(Array<YEvent<any>>,Transaction):void} f Observer function\n   */\n  observeDeep (f) {\n    addEventHandlerListener(this._dEH, f);\n  }\n\n  /**\n   * Unregister an observer function.\n   *\n   * @param {function(EventType,Transaction):void} f Observer function\n   */\n  unobserve (f) {\n    removeEventHandlerListener(this._eH, f);\n  }\n\n  /**\n   * Unregister an observer function.\n   *\n   * @param {function(Array<YEvent<any>>,Transaction):void} f Observer function\n   */\n  unobserveDeep (f) {\n    removeEventHandlerListener(this._dEH, f);\n  }\n\n  /**\n   * @abstract\n   * @return {any}\n   */\n  toJSON () {}\n}\n\n/**\n * @param {AbstractType<any>} type\n * @param {number} start\n * @param {number} end\n * @return {Array<any>}\n *\n * @private\n * @function\n */\nconst typeListSlice = (type, start, end) => {\n  if (start < 0) {\n    start = type._length + start;\n  }\n  if (end < 0) {\n    end = type._length + end;\n  }\n  let len = end - start;\n  const cs = [];\n  let n = type._start;\n  while (n !== null && len > 0) {\n    if (n.countable && !n.deleted) {\n      const c = n.content.getContent();\n      if (c.length <= start) {\n        start -= c.length;\n      } else {\n        for (let i = start; i < c.length && len > 0; i++) {\n          cs.push(c[i]);\n          len--;\n        }\n        start = 0;\n      }\n    }\n    n = n.right;\n  }\n  return cs\n};\n\n/**\n * @param {AbstractType<any>} type\n * @return {Array<any>}\n *\n * @private\n * @function\n */\nconst typeListToArray = type => {\n  const cs = [];\n  let n = type._start;\n  while (n !== null) {\n    if (n.countable && !n.deleted) {\n      const c = n.content.getContent();\n      for (let i = 0; i < c.length; i++) {\n        cs.push(c[i]);\n      }\n    }\n    n = n.right;\n  }\n  return cs\n};\n\n/**\n * @param {AbstractType<any>} type\n * @param {Snapshot} snapshot\n * @return {Array<any>}\n *\n * @private\n * @function\n */\nconst typeListToArraySnapshot = (type, snapshot) => {\n  const cs = [];\n  let n = type._start;\n  while (n !== null) {\n    if (n.countable && isVisible(n, snapshot)) {\n      const c = n.content.getContent();\n      for (let i = 0; i < c.length; i++) {\n        cs.push(c[i]);\n      }\n    }\n    n = n.right;\n  }\n  return cs\n};\n\n/**\n * Executes a provided function on once on every element of this YArray.\n *\n * @param {AbstractType<any>} type\n * @param {function(any,number,any):void} f A function to execute on every element of this YArray.\n *\n * @private\n * @function\n */\nconst typeListForEach = (type, f) => {\n  let index = 0;\n  let n = type._start;\n  while (n !== null) {\n    if (n.countable && !n.deleted) {\n      const c = n.content.getContent();\n      for (let i = 0; i < c.length; i++) {\n        f(c[i], index++, type);\n      }\n    }\n    n = n.right;\n  }\n};\n\n/**\n * @template C,R\n * @param {AbstractType<any>} type\n * @param {function(C,number,AbstractType<any>):R} f\n * @return {Array<R>}\n *\n * @private\n * @function\n */\nconst typeListMap = (type, f) => {\n  /**\n   * @type {Array<any>}\n   */\n  const result = [];\n  typeListForEach(type, (c, i) => {\n    result.push(f(c, i, type));\n  });\n  return result\n};\n\n/**\n * @param {AbstractType<any>} type\n * @return {IterableIterator<any>}\n *\n * @private\n * @function\n */\nconst typeListCreateIterator = type => {\n  let n = type._start;\n  /**\n   * @type {Array<any>|null}\n   */\n  let currentContent = null;\n  let currentContentIndex = 0;\n  return {\n    [Symbol.iterator] () {\n      return this\n    },\n    next: () => {\n      // find some content\n      if (currentContent === null) {\n        while (n !== null && n.deleted) {\n          n = n.right;\n        }\n        // check if we reached the end, no need to check currentContent, because it does not exist\n        if (n === null) {\n          return {\n            done: true,\n            value: undefined\n          }\n        }\n        // we found n, so we can set currentContent\n        currentContent = n.content.getContent();\n        currentContentIndex = 0;\n        n = n.right; // we used the content of n, now iterate to next\n      }\n      const value = currentContent[currentContentIndex++];\n      // check if we need to empty currentContent\n      if (currentContent.length <= currentContentIndex) {\n        currentContent = null;\n      }\n      return {\n        done: false,\n        value\n      }\n    }\n  }\n};\n\n/**\n * @param {AbstractType<any>} type\n * @param {number} index\n * @return {any}\n *\n * @private\n * @function\n */\nconst typeListGet = (type, index) => {\n  const marker = findMarker(type, index);\n  let n = type._start;\n  if (marker !== null) {\n    n = marker.p;\n    index -= marker.index;\n  }\n  for (; n !== null; n = n.right) {\n    if (!n.deleted && n.countable) {\n      if (index < n.length) {\n        return n.content.getContent()[index]\n      }\n      index -= n.length;\n    }\n  }\n};\n\n/**\n * @param {Transaction} transaction\n * @param {AbstractType<any>} parent\n * @param {Item?} referenceItem\n * @param {Array<Object<string,any>|Array<any>|boolean|number|null|string|Uint8Array>} content\n *\n * @private\n * @function\n */\nconst typeListInsertGenericsAfter = (transaction, parent, referenceItem, content) => {\n  let left = referenceItem;\n  const doc = transaction.doc;\n  const ownClientId = doc.clientID;\n  const store = doc.store;\n  const right = referenceItem === null ? parent._start : referenceItem.right;\n  /**\n   * @type {Array<Object|Array<any>|number|null>}\n   */\n  let jsonContent = [];\n  const packJsonContent = () => {\n    if (jsonContent.length > 0) {\n      left = new Item(createID(ownClientId, getState(store, ownClientId)), left, left && left.lastId, right, right && right.id, parent, null, new ContentAny(jsonContent));\n      left.integrate(transaction, 0);\n      jsonContent = [];\n    }\n  };\n  content.forEach(c => {\n    if (c === null) {\n      jsonContent.push(c);\n    } else {\n      switch (c.constructor) {\n        case Number:\n        case Object:\n        case Boolean:\n        case Array:\n        case String:\n          jsonContent.push(c);\n          break\n        default:\n          packJsonContent();\n          switch (c.constructor) {\n            case Uint8Array:\n            case ArrayBuffer:\n              left = new Item(createID(ownClientId, getState(store, ownClientId)), left, left && left.lastId, right, right && right.id, parent, null, new ContentBinary(new Uint8Array(/** @type {Uint8Array} */ (c))));\n              left.integrate(transaction, 0);\n              break\n            case Doc:\n              left = new Item(createID(ownClientId, getState(store, ownClientId)), left, left && left.lastId, right, right && right.id, parent, null, new ContentDoc(/** @type {Doc} */ (c)));\n              left.integrate(transaction, 0);\n              break\n            default:\n              if (c instanceof AbstractType) {\n                left = new Item(createID(ownClientId, getState(store, ownClientId)), left, left && left.lastId, right, right && right.id, parent, null, new ContentType(c));\n                left.integrate(transaction, 0);\n              } else {\n                throw new Error('Unexpected content type in insert operation')\n              }\n          }\n      }\n    }\n  });\n  packJsonContent();\n};\n\nconst lengthExceeded = () => error.create('Length exceeded!');\n\n/**\n * @param {Transaction} transaction\n * @param {AbstractType<any>} parent\n * @param {number} index\n * @param {Array<Object<string,any>|Array<any>|number|null|string|Uint8Array>} content\n *\n * @private\n * @function\n */\nconst typeListInsertGenerics = (transaction, parent, index, content) => {\n  if (index > parent._length) {\n    throw lengthExceeded()\n  }\n  if (index === 0) {\n    if (parent._searchMarker) {\n      updateMarkerChanges(parent._searchMarker, index, content.length);\n    }\n    return typeListInsertGenericsAfter(transaction, parent, null, content)\n  }\n  const startIndex = index;\n  const marker = findMarker(parent, index);\n  let n = parent._start;\n  if (marker !== null) {\n    n = marker.p;\n    index -= marker.index;\n    // we need to iterate one to the left so that the algorithm works\n    if (index === 0) {\n      // @todo refactor this as it actually doesn't consider formats\n      n = n.prev; // important! get the left undeleted item so that we can actually decrease index\n      index += (n && n.countable && !n.deleted) ? n.length : 0;\n    }\n  }\n  for (; n !== null; n = n.right) {\n    if (!n.deleted && n.countable) {\n      if (index <= n.length) {\n        if (index < n.length) {\n          // insert in-between\n          getItemCleanStart(transaction, createID(n.id.client, n.id.clock + index));\n        }\n        break\n      }\n      index -= n.length;\n    }\n  }\n  if (parent._searchMarker) {\n    updateMarkerChanges(parent._searchMarker, startIndex, content.length);\n  }\n  return typeListInsertGenericsAfter(transaction, parent, n, content)\n};\n\n/**\n * Pushing content is special as we generally want to push after the last item. So we don't have to update\n * the serach marker.\n *\n * @param {Transaction} transaction\n * @param {AbstractType<any>} parent\n * @param {Array<Object<string,any>|Array<any>|number|null|string|Uint8Array>} content\n *\n * @private\n * @function\n */\nconst typeListPushGenerics = (transaction, parent, content) => {\n  // Use the marker with the highest index and iterate to the right.\n  const marker = (parent._searchMarker || []).reduce((maxMarker, currMarker) => currMarker.index > maxMarker.index ? currMarker : maxMarker, { index: 0, p: parent._start });\n  let n = marker.p;\n  if (n) {\n    while (n.right) {\n      n = n.right;\n    }\n  }\n  return typeListInsertGenericsAfter(transaction, parent, n, content)\n};\n\n/**\n * @param {Transaction} transaction\n * @param {AbstractType<any>} parent\n * @param {number} index\n * @param {number} length\n *\n * @private\n * @function\n */\nconst typeListDelete = (transaction, parent, index, length) => {\n  if (length === 0) { return }\n  const startIndex = index;\n  const startLength = length;\n  const marker = findMarker(parent, index);\n  let n = parent._start;\n  if (marker !== null) {\n    n = marker.p;\n    index -= marker.index;\n  }\n  // compute the first item to be deleted\n  for (; n !== null && index > 0; n = n.right) {\n    if (!n.deleted && n.countable) {\n      if (index < n.length) {\n        getItemCleanStart(transaction, createID(n.id.client, n.id.clock + index));\n      }\n      index -= n.length;\n    }\n  }\n  // delete all items until done\n  while (length > 0 && n !== null) {\n    if (!n.deleted) {\n      if (length < n.length) {\n        getItemCleanStart(transaction, createID(n.id.client, n.id.clock + length));\n      }\n      n.delete(transaction);\n      length -= n.length;\n    }\n    n = n.right;\n  }\n  if (length > 0) {\n    throw lengthExceeded()\n  }\n  if (parent._searchMarker) {\n    updateMarkerChanges(parent._searchMarker, startIndex, -startLength + length /* in case we remove the above exception */);\n  }\n};\n\n/**\n * @param {Transaction} transaction\n * @param {AbstractType<any>} parent\n * @param {string} key\n *\n * @private\n * @function\n */\nconst typeMapDelete = (transaction, parent, key) => {\n  const c = parent._map.get(key);\n  if (c !== undefined) {\n    c.delete(transaction);\n  }\n};\n\n/**\n * @param {Transaction} transaction\n * @param {AbstractType<any>} parent\n * @param {string} key\n * @param {Object|number|null|Array<any>|string|Uint8Array|AbstractType<any>} value\n *\n * @private\n * @function\n */\nconst typeMapSet = (transaction, parent, key, value) => {\n  const left = parent._map.get(key) || null;\n  const doc = transaction.doc;\n  const ownClientId = doc.clientID;\n  let content;\n  if (value == null) {\n    content = new ContentAny([value]);\n  } else {\n    switch (value.constructor) {\n      case Number:\n      case Object:\n      case Boolean:\n      case Array:\n      case String:\n        content = new ContentAny([value]);\n        break\n      case Uint8Array:\n        content = new ContentBinary(/** @type {Uint8Array} */ (value));\n        break\n      case Doc:\n        content = new ContentDoc(/** @type {Doc} */ (value));\n        break\n      default:\n        if (value instanceof AbstractType) {\n          content = new ContentType(value);\n        } else {\n          throw new Error('Unexpected content type')\n        }\n    }\n  }\n  new Item(createID(ownClientId, getState(doc.store, ownClientId)), left, left && left.lastId, null, null, parent, key, content).integrate(transaction, 0);\n};\n\n/**\n * @param {AbstractType<any>} parent\n * @param {string} key\n * @return {Object<string,any>|number|null|Array<any>|string|Uint8Array|AbstractType<any>|undefined}\n *\n * @private\n * @function\n */\nconst typeMapGet = (parent, key) => {\n  const val = parent._map.get(key);\n  return val !== undefined && !val.deleted ? val.content.getContent()[val.length - 1] : undefined\n};\n\n/**\n * @param {AbstractType<any>} parent\n * @return {Object<string,Object<string,any>|number|null|Array<any>|string|Uint8Array|AbstractType<any>|undefined>}\n *\n * @private\n * @function\n */\nconst typeMapGetAll = (parent) => {\n  /**\n   * @type {Object<string,any>}\n   */\n  const res = {};\n  parent._map.forEach((value, key) => {\n    if (!value.deleted) {\n      res[key] = value.content.getContent()[value.length - 1];\n    }\n  });\n  return res\n};\n\n/**\n * @param {AbstractType<any>} parent\n * @param {string} key\n * @return {boolean}\n *\n * @private\n * @function\n */\nconst typeMapHas = (parent, key) => {\n  const val = parent._map.get(key);\n  return val !== undefined && !val.deleted\n};\n\n/**\n * @param {AbstractType<any>} parent\n * @param {string} key\n * @param {Snapshot} snapshot\n * @return {Object<string,any>|number|null|Array<any>|string|Uint8Array|AbstractType<any>|undefined}\n *\n * @private\n * @function\n */\nconst typeMapGetSnapshot = (parent, key, snapshot) => {\n  let v = parent._map.get(key) || null;\n  while (v !== null && (!snapshot.sv.has(v.id.client) || v.id.clock >= (snapshot.sv.get(v.id.client) || 0))) {\n    v = v.left;\n  }\n  return v !== null && isVisible(v, snapshot) ? v.content.getContent()[v.length - 1] : undefined\n};\n\n/**\n * @param {AbstractType<any>} parent\n * @param {Snapshot} snapshot\n * @return {Object<string,Object<string,any>|number|null|Array<any>|string|Uint8Array|AbstractType<any>|undefined>}\n *\n * @private\n * @function\n */\nconst typeMapGetAllSnapshot = (parent, snapshot) => {\n  /**\n   * @type {Object<string,any>}\n   */\n  const res = {};\n  parent._map.forEach((value, key) => {\n    /**\n     * @type {Item|null}\n     */\n    let v = value;\n    while (v !== null && (!snapshot.sv.has(v.id.client) || v.id.clock >= (snapshot.sv.get(v.id.client) || 0))) {\n      v = v.left;\n    }\n    if (v !== null && isVisible(v, snapshot)) {\n      res[key] = v.content.getContent()[v.length - 1];\n    }\n  });\n  return res\n};\n\n/**\n * @param {Map<string,Item>} map\n * @return {IterableIterator<Array<any>>}\n *\n * @private\n * @function\n */\nconst createMapIterator = map => iterator.iteratorFilter(map.entries(), /** @param {any} entry */ entry => !entry[1].deleted);\n\n/**\n * @module YArray\n */\n\n\n/**\n * Event that describes the changes on a YArray\n * @template T\n * @extends YEvent<YArray<T>>\n */\nclass YArrayEvent extends YEvent {}\n\n/**\n * A shared Array implementation.\n * @template T\n * @extends AbstractType<YArrayEvent<T>>\n * @implements {Iterable<T>}\n */\nclass YArray extends AbstractType {\n  constructor () {\n    super();\n    /**\n     * @type {Array<any>?}\n     * @private\n     */\n    this._prelimContent = [];\n    /**\n     * @type {Array<ArraySearchMarker>}\n     */\n    this._searchMarker = [];\n  }\n\n  /**\n   * Construct a new YArray containing the specified items.\n   * @template {Object<string,any>|Array<any>|number|null|string|Uint8Array} T\n   * @param {Array<T>} items\n   * @return {YArray<T>}\n   */\n  static from (items) {\n    /**\n     * @type {YArray<T>}\n     */\n    const a = new YArray();\n    a.push(items);\n    return a\n  }\n\n  /**\n   * Integrate this type into the Yjs instance.\n   *\n   * * Save this struct in the os\n   * * This type is sent to other client\n   * * Observer functions are fired\n   *\n   * @param {Doc} y The Yjs instance\n   * @param {Item} item\n   */\n  _integrate (y, item) {\n    super._integrate(y, item);\n    this.insert(0, /** @type {Array<any>} */ (this._prelimContent));\n    this._prelimContent = null;\n  }\n\n  /**\n   * @return {YArray<T>}\n   */\n  _copy () {\n    return new YArray()\n  }\n\n  /**\n   * Makes a copy of this data type that can be included somewhere else.\n   *\n   * Note that the content is only readable _after_ it has been included somewhere in the Ydoc.\n   *\n   * @return {YArray<T>}\n   */\n  clone () {\n    /**\n     * @type {YArray<T>}\n     */\n    const arr = new YArray();\n    arr.insert(0, this.toArray().map(el =>\n      el instanceof AbstractType ? /** @type {typeof el} */ (el.clone()) : el\n    ));\n    return arr\n  }\n\n  get length () {\n    return this._prelimContent === null ? this._length : this._prelimContent.length\n  }\n\n  /**\n   * Creates YArrayEvent and calls observers.\n   *\n   * @param {Transaction} transaction\n   * @param {Set<null|string>} parentSubs Keys changed on this type. `null` if list was modified.\n   */\n  _callObserver (transaction, parentSubs) {\n    super._callObserver(transaction, parentSubs);\n    callTypeObservers(this, transaction, new YArrayEvent(this, transaction));\n  }\n\n  /**\n   * Inserts new content at an index.\n   *\n   * Important: This function expects an array of content. Not just a content\n   * object. The reason for this \"weirdness\" is that inserting several elements\n   * is very efficient when it is done as a single operation.\n   *\n   * @example\n   *  // Insert character 'a' at position 0\n   *  yarray.insert(0, ['a'])\n   *  // Insert numbers 1, 2 at position 1\n   *  yarray.insert(1, [1, 2])\n   *\n   * @param {number} index The index to insert content at.\n   * @param {Array<T>} content The array of content\n   */\n  insert (index, content) {\n    if (this.doc !== null) {\n      transact(this.doc, transaction => {\n        typeListInsertGenerics(transaction, this, index, /** @type {any} */ (content));\n      });\n    } else {\n      /** @type {Array<any>} */ (this._prelimContent).splice(index, 0, ...content);\n    }\n  }\n\n  /**\n   * Appends content to this YArray.\n   *\n   * @param {Array<T>} content Array of content to append.\n   *\n   * @todo Use the following implementation in all types.\n   */\n  push (content) {\n    if (this.doc !== null) {\n      transact(this.doc, transaction => {\n        typeListPushGenerics(transaction, this, /** @type {any} */ (content));\n      });\n    } else {\n      /** @type {Array<any>} */ (this._prelimContent).push(...content);\n    }\n  }\n\n  /**\n   * Prepends content to this YArray.\n   *\n   * @param {Array<T>} content Array of content to prepend.\n   */\n  unshift (content) {\n    this.insert(0, content);\n  }\n\n  /**\n   * Deletes elements starting from an index.\n   *\n   * @param {number} index Index at which to start deleting elements\n   * @param {number} length The number of elements to remove. Defaults to 1.\n   */\n  delete (index, length = 1) {\n    if (this.doc !== null) {\n      transact(this.doc, transaction => {\n        typeListDelete(transaction, this, index, length);\n      });\n    } else {\n      /** @type {Array<any>} */ (this._prelimContent).splice(index, length);\n    }\n  }\n\n  /**\n   * Returns the i-th element from a YArray.\n   *\n   * @param {number} index The index of the element to return from the YArray\n   * @return {T}\n   */\n  get (index) {\n    return typeListGet(this, index)\n  }\n\n  /**\n   * Transforms this YArray to a JavaScript Array.\n   *\n   * @return {Array<T>}\n   */\n  toArray () {\n    return typeListToArray(this)\n  }\n\n  /**\n   * Returns a portion of this YArray into a JavaScript Array selected\n   * from start to end (end not included).\n   *\n   * @param {number} [start]\n   * @param {number} [end]\n   * @return {Array<T>}\n   */\n  slice (start = 0, end = this.length) {\n    return typeListSlice(this, start, end)\n  }\n\n  /**\n   * Transforms this Shared Type to a JSON object.\n   *\n   * @return {Array<any>}\n   */\n  toJSON () {\n    return this.map(c => c instanceof AbstractType ? c.toJSON() : c)\n  }\n\n  /**\n   * Returns an Array with the result of calling a provided function on every\n   * element of this YArray.\n   *\n   * @template M\n   * @param {function(T,number,YArray<T>):M} f Function that produces an element of the new Array\n   * @return {Array<M>} A new array with each element being the result of the\n   *                 callback function\n   */\n  map (f) {\n    return typeListMap(this, /** @type {any} */ (f))\n  }\n\n  /**\n   * Executes a provided function once on every element of this YArray.\n   *\n   * @param {function(T,number,YArray<T>):void} f A function to execute on every element of this YArray.\n   */\n  forEach (f) {\n    typeListForEach(this, f);\n  }\n\n  /**\n   * @return {IterableIterator<T>}\n   */\n  [Symbol.iterator] () {\n    return typeListCreateIterator(this)\n  }\n\n  /**\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n   */\n  _write (encoder) {\n    encoder.writeTypeRef(YArrayRefID);\n  }\n}\n\n/**\n * @param {UpdateDecoderV1 | UpdateDecoderV2} _decoder\n *\n * @private\n * @function\n */\nconst readYArray = _decoder => new YArray();\n\n/**\n * @module YMap\n */\n\n\n/**\n * @template T\n * @extends YEvent<YMap<T>>\n * Event that describes the changes on a YMap.\n */\nclass YMapEvent extends YEvent {\n  /**\n   * @param {YMap<T>} ymap The YArray that changed.\n   * @param {Transaction} transaction\n   * @param {Set<any>} subs The keys that changed.\n   */\n  constructor (ymap, transaction, subs) {\n    super(ymap, transaction);\n    this.keysChanged = subs;\n  }\n}\n\n/**\n * @template MapType\n * A shared Map implementation.\n *\n * @extends AbstractType<YMapEvent<MapType>>\n * @implements {Iterable<[string, MapType]>}\n */\nclass YMap extends AbstractType {\n  /**\n   *\n   * @param {Iterable<readonly [string, any]>=} entries - an optional iterable to initialize the YMap\n   */\n  constructor (entries) {\n    super();\n    /**\n     * @type {Map<string,any>?}\n     * @private\n     */\n    this._prelimContent = null;\n\n    if (entries === undefined) {\n      this._prelimContent = new Map();\n    } else {\n      this._prelimContent = new Map(entries);\n    }\n  }\n\n  /**\n   * Integrate this type into the Yjs instance.\n   *\n   * * Save this struct in the os\n   * * This type is sent to other client\n   * * Observer functions are fired\n   *\n   * @param {Doc} y The Yjs instance\n   * @param {Item} item\n   */\n  _integrate (y, item) {\n    super._integrate(y, item)\n    ;/** @type {Map<string, any>} */ (this._prelimContent).forEach((value, key) => {\n      this.set(key, value);\n    });\n    this._prelimContent = null;\n  }\n\n  /**\n   * @return {YMap<MapType>}\n   */\n  _copy () {\n    return new YMap()\n  }\n\n  /**\n   * Makes a copy of this data type that can be included somewhere else.\n   *\n   * Note that the content is only readable _after_ it has been included somewhere in the Ydoc.\n   *\n   * @return {YMap<MapType>}\n   */\n  clone () {\n    /**\n     * @type {YMap<MapType>}\n     */\n    const map = new YMap();\n    this.forEach((value, key) => {\n      map.set(key, value instanceof AbstractType ? /** @type {typeof value} */ (value.clone()) : value);\n    });\n    return map\n  }\n\n  /**\n   * Creates YMapEvent and calls observers.\n   *\n   * @param {Transaction} transaction\n   * @param {Set<null|string>} parentSubs Keys changed on this type. `null` if list was modified.\n   */\n  _callObserver (transaction, parentSubs) {\n    callTypeObservers(this, transaction, new YMapEvent(this, transaction, parentSubs));\n  }\n\n  /**\n   * Transforms this Shared Type to a JSON object.\n   *\n   * @return {Object<string,any>}\n   */\n  toJSON () {\n    /**\n     * @type {Object<string,MapType>}\n     */\n    const map = {};\n    this._map.forEach((item, key) => {\n      if (!item.deleted) {\n        const v = item.content.getContent()[item.length - 1];\n        map[key] = v instanceof AbstractType ? v.toJSON() : v;\n      }\n    });\n    return map\n  }\n\n  /**\n   * Returns the size of the YMap (count of key/value pairs)\n   *\n   * @return {number}\n   */\n  get size () {\n    return [...createMapIterator(this._map)].length\n  }\n\n  /**\n   * Returns the keys for each element in the YMap Type.\n   *\n   * @return {IterableIterator<string>}\n   */\n  keys () {\n    return iterator.iteratorMap(createMapIterator(this._map), /** @param {any} v */ v => v[0])\n  }\n\n  /**\n   * Returns the values for each element in the YMap Type.\n   *\n   * @return {IterableIterator<MapType>}\n   */\n  values () {\n    return iterator.iteratorMap(createMapIterator(this._map), /** @param {any} v */ v => v[1].content.getContent()[v[1].length - 1])\n  }\n\n  /**\n   * Returns an Iterator of [key, value] pairs\n   *\n   * @return {IterableIterator<[string, MapType]>}\n   */\n  entries () {\n    return iterator.iteratorMap(createMapIterator(this._map), /** @param {any} v */ v => /** @type {any} */ ([v[0], v[1].content.getContent()[v[1].length - 1]]))\n  }\n\n  /**\n   * Executes a provided function on once on every key-value pair.\n   *\n   * @param {function(MapType,string,YMap<MapType>):void} f A function to execute on every element of this YArray.\n   */\n  forEach (f) {\n    this._map.forEach((item, key) => {\n      if (!item.deleted) {\n        f(item.content.getContent()[item.length - 1], key, this);\n      }\n    });\n  }\n\n  /**\n   * Returns an Iterator of [key, value] pairs\n   *\n   * @return {IterableIterator<[string, MapType]>}\n   */\n  [Symbol.iterator] () {\n    return this.entries()\n  }\n\n  /**\n   * Remove a specified element from this YMap.\n   *\n   * @param {string} key The key of the element to remove.\n   */\n  delete (key) {\n    if (this.doc !== null) {\n      transact(this.doc, transaction => {\n        typeMapDelete(transaction, this, key);\n      });\n    } else {\n      /** @type {Map<string, any>} */ (this._prelimContent).delete(key);\n    }\n  }\n\n  /**\n   * Adds or updates an element with a specified key and value.\n   * @template {MapType} VAL\n   *\n   * @param {string} key The key of the element to add to this YMap\n   * @param {VAL} value The value of the element to add\n   * @return {VAL}\n   */\n  set (key, value) {\n    if (this.doc !== null) {\n      transact(this.doc, transaction => {\n        typeMapSet(transaction, this, key, /** @type {any} */ (value));\n      });\n    } else {\n      /** @type {Map<string, any>} */ (this._prelimContent).set(key, value);\n    }\n    return value\n  }\n\n  /**\n   * Returns a specified element from this YMap.\n   *\n   * @param {string} key\n   * @return {MapType|undefined}\n   */\n  get (key) {\n    return /** @type {any} */ (typeMapGet(this, key))\n  }\n\n  /**\n   * Returns a boolean indicating whether the specified key exists or not.\n   *\n   * @param {string} key The key to test.\n   * @return {boolean}\n   */\n  has (key) {\n    return typeMapHas(this, key)\n  }\n\n  /**\n   * Removes all elements from this YMap.\n   */\n  clear () {\n    if (this.doc !== null) {\n      transact(this.doc, transaction => {\n        this.forEach(function (_value, key, map) {\n          typeMapDelete(transaction, map, key);\n        });\n      });\n    } else {\n      /** @type {Map<string, any>} */ (this._prelimContent).clear();\n    }\n  }\n\n  /**\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n   */\n  _write (encoder) {\n    encoder.writeTypeRef(YMapRefID);\n  }\n}\n\n/**\n * @param {UpdateDecoderV1 | UpdateDecoderV2} _decoder\n *\n * @private\n * @function\n */\nconst readYMap = _decoder => new YMap();\n\n/**\n * @module YText\n */\n\n\n/**\n * @param {any} a\n * @param {any} b\n * @return {boolean}\n */\nconst equalAttrs = (a, b) => a === b || (typeof a === 'object' && typeof b === 'object' && a && b && object.equalFlat(a, b));\n\nclass ItemTextListPosition {\n  /**\n   * @param {Item|null} left\n   * @param {Item|null} right\n   * @param {number} index\n   * @param {Map<string,any>} currentAttributes\n   */\n  constructor (left, right, index, currentAttributes) {\n    this.left = left;\n    this.right = right;\n    this.index = index;\n    this.currentAttributes = currentAttributes;\n  }\n\n  /**\n   * Only call this if you know that this.right is defined\n   */\n  forward () {\n    if (this.right === null) {\n      error.unexpectedCase();\n    }\n    switch (this.right.content.constructor) {\n      case ContentFormat:\n        if (!this.right.deleted) {\n          updateCurrentAttributes(this.currentAttributes, /** @type {ContentFormat} */ (this.right.content));\n        }\n        break\n      default:\n        if (!this.right.deleted) {\n          this.index += this.right.length;\n        }\n        break\n    }\n    this.left = this.right;\n    this.right = this.right.right;\n  }\n}\n\n/**\n * @param {Transaction} transaction\n * @param {ItemTextListPosition} pos\n * @param {number} count steps to move forward\n * @return {ItemTextListPosition}\n *\n * @private\n * @function\n */\nconst findNextPosition = (transaction, pos, count) => {\n  while (pos.right !== null && count > 0) {\n    switch (pos.right.content.constructor) {\n      case ContentFormat:\n        if (!pos.right.deleted) {\n          updateCurrentAttributes(pos.currentAttributes, /** @type {ContentFormat} */ (pos.right.content));\n        }\n        break\n      default:\n        if (!pos.right.deleted) {\n          if (count < pos.right.length) {\n            // split right\n            getItemCleanStart(transaction, createID(pos.right.id.client, pos.right.id.clock + count));\n          }\n          pos.index += pos.right.length;\n          count -= pos.right.length;\n        }\n        break\n    }\n    pos.left = pos.right;\n    pos.right = pos.right.right;\n    // pos.forward() - we don't forward because that would halve the performance because we already do the checks above\n  }\n  return pos\n};\n\n/**\n * @param {Transaction} transaction\n * @param {AbstractType<any>} parent\n * @param {number} index\n * @param {boolean} useSearchMarker\n * @return {ItemTextListPosition}\n *\n * @private\n * @function\n */\nconst findPosition = (transaction, parent, index, useSearchMarker) => {\n  const currentAttributes = new Map();\n  const marker = useSearchMarker ? findMarker(parent, index) : null;\n  if (marker) {\n    const pos = new ItemTextListPosition(marker.p.left, marker.p, marker.index, currentAttributes);\n    return findNextPosition(transaction, pos, index - marker.index)\n  } else {\n    const pos = new ItemTextListPosition(null, parent._start, 0, currentAttributes);\n    return findNextPosition(transaction, pos, index)\n  }\n};\n\n/**\n * Negate applied formats\n *\n * @param {Transaction} transaction\n * @param {AbstractType<any>} parent\n * @param {ItemTextListPosition} currPos\n * @param {Map<string,any>} negatedAttributes\n *\n * @private\n * @function\n */\nconst insertNegatedAttributes = (transaction, parent, currPos, negatedAttributes) => {\n  // check if we really need to remove attributes\n  while (\n    currPos.right !== null && (\n      currPos.right.deleted === true || (\n        currPos.right.content.constructor === ContentFormat &&\n        equalAttrs(negatedAttributes.get(/** @type {ContentFormat} */ (currPos.right.content).key), /** @type {ContentFormat} */ (currPos.right.content).value)\n      )\n    )\n  ) {\n    if (!currPos.right.deleted) {\n      negatedAttributes.delete(/** @type {ContentFormat} */ (currPos.right.content).key);\n    }\n    currPos.forward();\n  }\n  const doc = transaction.doc;\n  const ownClientId = doc.clientID;\n  negatedAttributes.forEach((val, key) => {\n    const left = currPos.left;\n    const right = currPos.right;\n    const nextFormat = new Item(createID(ownClientId, getState(doc.store, ownClientId)), left, left && left.lastId, right, right && right.id, parent, null, new ContentFormat(key, val));\n    nextFormat.integrate(transaction, 0);\n    currPos.right = nextFormat;\n    currPos.forward();\n  });\n};\n\n/**\n * @param {Map<string,any>} currentAttributes\n * @param {ContentFormat} format\n *\n * @private\n * @function\n */\nconst updateCurrentAttributes = (currentAttributes, format) => {\n  const { key, value } = format;\n  if (value === null) {\n    currentAttributes.delete(key);\n  } else {\n    currentAttributes.set(key, value);\n  }\n};\n\n/**\n * @param {ItemTextListPosition} currPos\n * @param {Object<string,any>} attributes\n *\n * @private\n * @function\n */\nconst minimizeAttributeChanges = (currPos, attributes) => {\n  // go right while attributes[right.key] === right.value (or right is deleted)\n  while (true) {\n    if (currPos.right === null) {\n      break\n    } else if (currPos.right.deleted || (currPos.right.content.constructor === ContentFormat && equalAttrs(attributes[(/** @type {ContentFormat} */ (currPos.right.content)).key] ?? null, /** @type {ContentFormat} */ (currPos.right.content).value))) ; else {\n      break\n    }\n    currPos.forward();\n  }\n};\n\n/**\n * @param {Transaction} transaction\n * @param {AbstractType<any>} parent\n * @param {ItemTextListPosition} currPos\n * @param {Object<string,any>} attributes\n * @return {Map<string,any>}\n *\n * @private\n * @function\n **/\nconst insertAttributes = (transaction, parent, currPos, attributes) => {\n  const doc = transaction.doc;\n  const ownClientId = doc.clientID;\n  const negatedAttributes = new Map();\n  // insert format-start items\n  for (const key in attributes) {\n    const val = attributes[key];\n    const currentVal = currPos.currentAttributes.get(key) ?? null;\n    if (!equalAttrs(currentVal, val)) {\n      // save negated attribute (set null if currentVal undefined)\n      negatedAttributes.set(key, currentVal);\n      const { left, right } = currPos;\n      currPos.right = new Item(createID(ownClientId, getState(doc.store, ownClientId)), left, left && left.lastId, right, right && right.id, parent, null, new ContentFormat(key, val));\n      currPos.right.integrate(transaction, 0);\n      currPos.forward();\n    }\n  }\n  return negatedAttributes\n};\n\n/**\n * @param {Transaction} transaction\n * @param {AbstractType<any>} parent\n * @param {ItemTextListPosition} currPos\n * @param {string|object|AbstractType<any>} text\n * @param {Object<string,any>} attributes\n *\n * @private\n * @function\n **/\nconst insertText = (transaction, parent, currPos, text, attributes) => {\n  currPos.currentAttributes.forEach((_val, key) => {\n    if (attributes[key] === undefined) {\n      attributes[key] = null;\n    }\n  });\n  const doc = transaction.doc;\n  const ownClientId = doc.clientID;\n  minimizeAttributeChanges(currPos, attributes);\n  const negatedAttributes = insertAttributes(transaction, parent, currPos, attributes);\n  // insert content\n  const content = text.constructor === String ? new ContentString(/** @type {string} */ (text)) : (text instanceof AbstractType ? new ContentType(text) : new ContentEmbed(text));\n  let { left, right, index } = currPos;\n  if (parent._searchMarker) {\n    updateMarkerChanges(parent._searchMarker, currPos.index, content.getLength());\n  }\n  right = new Item(createID(ownClientId, getState(doc.store, ownClientId)), left, left && left.lastId, right, right && right.id, parent, null, content);\n  right.integrate(transaction, 0);\n  currPos.right = right;\n  currPos.index = index;\n  currPos.forward();\n  insertNegatedAttributes(transaction, parent, currPos, negatedAttributes);\n};\n\n/**\n * @param {Transaction} transaction\n * @param {AbstractType<any>} parent\n * @param {ItemTextListPosition} currPos\n * @param {number} length\n * @param {Object<string,any>} attributes\n *\n * @private\n * @function\n */\nconst formatText = (transaction, parent, currPos, length, attributes) => {\n  const doc = transaction.doc;\n  const ownClientId = doc.clientID;\n  minimizeAttributeChanges(currPos, attributes);\n  const negatedAttributes = insertAttributes(transaction, parent, currPos, attributes);\n  // iterate until first non-format or null is found\n  // delete all formats with attributes[format.key] != null\n  // also check the attributes after the first non-format as we do not want to insert redundant negated attributes there\n  // eslint-disable-next-line no-labels\n  iterationLoop: while (\n    currPos.right !== null &&\n    (length > 0 ||\n      (\n        negatedAttributes.size > 0 &&\n        (currPos.right.deleted || currPos.right.content.constructor === ContentFormat)\n      )\n    )\n  ) {\n    if (!currPos.right.deleted) {\n      switch (currPos.right.content.constructor) {\n        case ContentFormat: {\n          const { key, value } = /** @type {ContentFormat} */ (currPos.right.content);\n          const attr = attributes[key];\n          if (attr !== undefined) {\n            if (equalAttrs(attr, value)) {\n              negatedAttributes.delete(key);\n            } else {\n              if (length === 0) {\n                // no need to further extend negatedAttributes\n                // eslint-disable-next-line no-labels\n                break iterationLoop\n              }\n              negatedAttributes.set(key, value);\n            }\n            currPos.right.delete(transaction);\n          } else {\n            currPos.currentAttributes.set(key, value);\n          }\n          break\n        }\n        default:\n          if (length < currPos.right.length) {\n            getItemCleanStart(transaction, createID(currPos.right.id.client, currPos.right.id.clock + length));\n          }\n          length -= currPos.right.length;\n          break\n      }\n    }\n    currPos.forward();\n  }\n  // Quill just assumes that the editor starts with a newline and that it always\n  // ends with a newline. We only insert that newline when a new newline is\n  // inserted - i.e when length is bigger than type.length\n  if (length > 0) {\n    let newlines = '';\n    for (; length > 0; length--) {\n      newlines += '\\n';\n    }\n    currPos.right = new Item(createID(ownClientId, getState(doc.store, ownClientId)), currPos.left, currPos.left && currPos.left.lastId, currPos.right, currPos.right && currPos.right.id, parent, null, new ContentString(newlines));\n    currPos.right.integrate(transaction, 0);\n    currPos.forward();\n  }\n  insertNegatedAttributes(transaction, parent, currPos, negatedAttributes);\n};\n\n/**\n * Call this function after string content has been deleted in order to\n * clean up formatting Items.\n *\n * @param {Transaction} transaction\n * @param {Item} start\n * @param {Item|null} curr exclusive end, automatically iterates to the next Content Item\n * @param {Map<string,any>} startAttributes\n * @param {Map<string,any>} currAttributes\n * @return {number} The amount of formatting Items deleted.\n *\n * @function\n */\nconst cleanupFormattingGap = (transaction, start, curr, startAttributes, currAttributes) => {\n  /**\n   * @type {Item|null}\n   */\n  let end = start;\n  /**\n   * @type {Map<string,ContentFormat>}\n   */\n  const endFormats = map.create();\n  while (end && (!end.countable || end.deleted)) {\n    if (!end.deleted && end.content.constructor === ContentFormat) {\n      const cf = /** @type {ContentFormat} */ (end.content);\n      endFormats.set(cf.key, cf);\n    }\n    end = end.right;\n  }\n  let cleanups = 0;\n  let reachedCurr = false;\n  while (start !== end) {\n    if (curr === start) {\n      reachedCurr = true;\n    }\n    if (!start.deleted) {\n      const content = start.content;\n      switch (content.constructor) {\n        case ContentFormat: {\n          const { key, value } = /** @type {ContentFormat} */ (content);\n          const startAttrValue = startAttributes.get(key) ?? null;\n          if (endFormats.get(key) !== content || startAttrValue === value) {\n            // Either this format is overwritten or it is not necessary because the attribute already existed.\n            start.delete(transaction);\n            cleanups++;\n            if (!reachedCurr && (currAttributes.get(key) ?? null) === value && startAttrValue !== value) {\n              if (startAttrValue === null) {\n                currAttributes.delete(key);\n              } else {\n                currAttributes.set(key, startAttrValue);\n              }\n            }\n          }\n          if (!reachedCurr && !start.deleted) {\n            updateCurrentAttributes(currAttributes, /** @type {ContentFormat} */ (content));\n          }\n          break\n        }\n      }\n    }\n    start = /** @type {Item} */ (start.right);\n  }\n  return cleanups\n};\n\n/**\n * @param {Transaction} transaction\n * @param {Item | null} item\n */\nconst cleanupContextlessFormattingGap = (transaction, item) => {\n  // iterate until item.right is null or content\n  while (item && item.right && (item.right.deleted || !item.right.countable)) {\n    item = item.right;\n  }\n  const attrs = new Set();\n  // iterate back until a content item is found\n  while (item && (item.deleted || !item.countable)) {\n    if (!item.deleted && item.content.constructor === ContentFormat) {\n      const key = /** @type {ContentFormat} */ (item.content).key;\n      if (attrs.has(key)) {\n        item.delete(transaction);\n      } else {\n        attrs.add(key);\n      }\n    }\n    item = item.left;\n  }\n};\n\n/**\n * This function is experimental and subject to change / be removed.\n *\n * Ideally, we don't need this function at all. Formatting attributes should be cleaned up\n * automatically after each change. This function iterates twice over the complete YText type\n * and removes unnecessary formatting attributes. This is also helpful for testing.\n *\n * This function won't be exported anymore as soon as there is confidence that the YText type works as intended.\n *\n * @param {YText} type\n * @return {number} How many formatting attributes have been cleaned up.\n */\nconst cleanupYTextFormatting = type => {\n  let res = 0;\n  transact(/** @type {Doc} */ (type.doc), transaction => {\n    let start = /** @type {Item} */ (type._start);\n    let end = type._start;\n    let startAttributes = map.create();\n    const currentAttributes = map.copy(startAttributes);\n    while (end) {\n      if (end.deleted === false) {\n        switch (end.content.constructor) {\n          case ContentFormat:\n            updateCurrentAttributes(currentAttributes, /** @type {ContentFormat} */ (end.content));\n            break\n          default:\n            res += cleanupFormattingGap(transaction, start, end, startAttributes, currentAttributes);\n            startAttributes = map.copy(currentAttributes);\n            start = end;\n            break\n        }\n      }\n      end = end.right;\n    }\n  });\n  return res\n};\n\n/**\n * This will be called by the transction once the event handlers are called to potentially cleanup\n * formatting attributes.\n *\n * @param {Transaction} transaction\n */\nconst cleanupYTextAfterTransaction = transaction => {\n  /**\n   * @type {Set<YText>}\n   */\n  const needFullCleanup = new Set();\n  // check if another formatting item was inserted\n  const doc = transaction.doc;\n  for (const [client, afterClock] of transaction.afterState.entries()) {\n    const clock = transaction.beforeState.get(client) || 0;\n    if (afterClock === clock) {\n      continue\n    }\n    iterateStructs(transaction, /** @type {Array<Item|GC>} */ (doc.store.clients.get(client)), clock, afterClock, item => {\n      if (\n        !item.deleted && /** @type {Item} */ (item).content.constructor === ContentFormat && item.constructor !== GC\n      ) {\n        needFullCleanup.add(/** @type {any} */ (item).parent);\n      }\n    });\n  }\n  // cleanup in a new transaction\n  transact(doc, (t) => {\n    iterateDeletedStructs(transaction, transaction.deleteSet, item => {\n      if (item instanceof GC || !(/** @type {YText} */ (item.parent)._hasFormatting) || needFullCleanup.has(/** @type {YText} */ (item.parent))) {\n        return\n      }\n      const parent = /** @type {YText} */ (item.parent);\n      if (item.content.constructor === ContentFormat) {\n        needFullCleanup.add(parent);\n      } else {\n        // If no formatting attribute was inserted or deleted, we can make due with contextless\n        // formatting cleanups.\n        // Contextless: it is not necessary to compute currentAttributes for the affected position.\n        cleanupContextlessFormattingGap(t, item);\n      }\n    });\n    // If a formatting item was inserted, we simply clean the whole type.\n    // We need to compute currentAttributes for the current position anyway.\n    for (const yText of needFullCleanup) {\n      cleanupYTextFormatting(yText);\n    }\n  });\n};\n\n/**\n * @param {Transaction} transaction\n * @param {ItemTextListPosition} currPos\n * @param {number} length\n * @return {ItemTextListPosition}\n *\n * @private\n * @function\n */\nconst deleteText = (transaction, currPos, length) => {\n  const startLength = length;\n  const startAttrs = map.copy(currPos.currentAttributes);\n  const start = currPos.right;\n  while (length > 0 && currPos.right !== null) {\n    if (currPos.right.deleted === false) {\n      switch (currPos.right.content.constructor) {\n        case ContentType:\n        case ContentEmbed:\n        case ContentString:\n          if (length < currPos.right.length) {\n            getItemCleanStart(transaction, createID(currPos.right.id.client, currPos.right.id.clock + length));\n          }\n          length -= currPos.right.length;\n          currPos.right.delete(transaction);\n          break\n      }\n    }\n    currPos.forward();\n  }\n  if (start) {\n    cleanupFormattingGap(transaction, start, currPos.right, startAttrs, currPos.currentAttributes);\n  }\n  const parent = /** @type {AbstractType<any>} */ (/** @type {Item} */ (currPos.left || currPos.right).parent);\n  if (parent._searchMarker) {\n    updateMarkerChanges(parent._searchMarker, currPos.index, -startLength + length);\n  }\n  return currPos\n};\n\n/**\n * The Quill Delta format represents changes on a text document with\n * formatting information. For mor information visit {@link https://quilljs.com/docs/delta/|Quill Delta}\n *\n * @example\n *   {\n *     ops: [\n *       { insert: 'Gandalf', attributes: { bold: true } },\n *       { insert: ' the ' },\n *       { insert: 'Grey', attributes: { color: '#cccccc' } }\n *     ]\n *   }\n *\n */\n\n/**\n  * Attributes that can be assigned to a selection of text.\n  *\n  * @example\n  *   {\n  *     bold: true,\n  *     font-size: '40px'\n  *   }\n  *\n  * @typedef {Object} TextAttributes\n  */\n\n/**\n * @extends YEvent<YText>\n * Event that describes the changes on a YText type.\n */\nclass YTextEvent extends YEvent {\n  /**\n   * @param {YText} ytext\n   * @param {Transaction} transaction\n   * @param {Set<any>} subs The keys that changed\n   */\n  constructor (ytext, transaction, subs) {\n    super(ytext, transaction);\n    /**\n     * Whether the children changed.\n     * @type {Boolean}\n     * @private\n     */\n    this.childListChanged = false;\n    /**\n     * Set of all changed attributes.\n     * @type {Set<string>}\n     */\n    this.keysChanged = new Set();\n    subs.forEach((sub) => {\n      if (sub === null) {\n        this.childListChanged = true;\n      } else {\n        this.keysChanged.add(sub);\n      }\n    });\n  }\n\n  /**\n   * @type {{added:Set<Item>,deleted:Set<Item>,keys:Map<string,{action:'add'|'update'|'delete',oldValue:any}>,delta:Array<{insert?:Array<any>|string, delete?:number, retain?:number}>}}\n   */\n  get changes () {\n    if (this._changes === null) {\n      /**\n       * @type {{added:Set<Item>,deleted:Set<Item>,keys:Map<string,{action:'add'|'update'|'delete',oldValue:any}>,delta:Array<{insert?:Array<any>|string|AbstractType<any>|object, delete?:number, retain?:number}>}}\n       */\n      const changes = {\n        keys: this.keys,\n        delta: this.delta,\n        added: new Set(),\n        deleted: new Set()\n      };\n      this._changes = changes;\n    }\n    return /** @type {any} */ (this._changes)\n  }\n\n  /**\n   * Compute the changes in the delta format.\n   * A {@link https://quilljs.com/docs/delta/|Quill Delta}) that represents the changes on the document.\n   *\n   * @type {Array<{insert?:string|object|AbstractType<any>, delete?:number, retain?:number, attributes?: Object<string,any>}>}\n   *\n   * @public\n   */\n  get delta () {\n    if (this._delta === null) {\n      const y = /** @type {Doc} */ (this.target.doc);\n      /**\n       * @type {Array<{insert?:string|object|AbstractType<any>, delete?:number, retain?:number, attributes?: Object<string,any>}>}\n       */\n      const delta = [];\n      transact(y, transaction => {\n        const currentAttributes = new Map(); // saves all current attributes for insert\n        const oldAttributes = new Map();\n        let item = this.target._start;\n        /**\n         * @type {string?}\n         */\n        let action = null;\n        /**\n         * @type {Object<string,any>}\n         */\n        const attributes = {}; // counts added or removed new attributes for retain\n        /**\n         * @type {string|object}\n         */\n        let insert = '';\n        let retain = 0;\n        let deleteLen = 0;\n        const addOp = () => {\n          if (action !== null) {\n            /**\n             * @type {any}\n             */\n            let op = null;\n            switch (action) {\n              case 'delete':\n                if (deleteLen > 0) {\n                  op = { delete: deleteLen };\n                }\n                deleteLen = 0;\n                break\n              case 'insert':\n                if (typeof insert === 'object' || insert.length > 0) {\n                  op = { insert };\n                  if (currentAttributes.size > 0) {\n                    op.attributes = {};\n                    currentAttributes.forEach((value, key) => {\n                      if (value !== null) {\n                        op.attributes[key] = value;\n                      }\n                    });\n                  }\n                }\n                insert = '';\n                break\n              case 'retain':\n                if (retain > 0) {\n                  op = { retain };\n                  if (!object.isEmpty(attributes)) {\n                    op.attributes = object.assign({}, attributes);\n                  }\n                }\n                retain = 0;\n                break\n            }\n            if (op) delta.push(op);\n            action = null;\n          }\n        };\n        while (item !== null) {\n          switch (item.content.constructor) {\n            case ContentType:\n            case ContentEmbed:\n              if (this.adds(item)) {\n                if (!this.deletes(item)) {\n                  addOp();\n                  action = 'insert';\n                  insert = item.content.getContent()[0];\n                  addOp();\n                }\n              } else if (this.deletes(item)) {\n                if (action !== 'delete') {\n                  addOp();\n                  action = 'delete';\n                }\n                deleteLen += 1;\n              } else if (!item.deleted) {\n                if (action !== 'retain') {\n                  addOp();\n                  action = 'retain';\n                }\n                retain += 1;\n              }\n              break\n            case ContentString:\n              if (this.adds(item)) {\n                if (!this.deletes(item)) {\n                  if (action !== 'insert') {\n                    addOp();\n                    action = 'insert';\n                  }\n                  insert += /** @type {ContentString} */ (item.content).str;\n                }\n              } else if (this.deletes(item)) {\n                if (action !== 'delete') {\n                  addOp();\n                  action = 'delete';\n                }\n                deleteLen += item.length;\n              } else if (!item.deleted) {\n                if (action !== 'retain') {\n                  addOp();\n                  action = 'retain';\n                }\n                retain += item.length;\n              }\n              break\n            case ContentFormat: {\n              const { key, value } = /** @type {ContentFormat} */ (item.content);\n              if (this.adds(item)) {\n                if (!this.deletes(item)) {\n                  const curVal = currentAttributes.get(key) ?? null;\n                  if (!equalAttrs(curVal, value)) {\n                    if (action === 'retain') {\n                      addOp();\n                    }\n                    if (equalAttrs(value, (oldAttributes.get(key) ?? null))) {\n                      delete attributes[key];\n                    } else {\n                      attributes[key] = value;\n                    }\n                  } else if (value !== null) {\n                    item.delete(transaction);\n                  }\n                }\n              } else if (this.deletes(item)) {\n                oldAttributes.set(key, value);\n                const curVal = currentAttributes.get(key) ?? null;\n                if (!equalAttrs(curVal, value)) {\n                  if (action === 'retain') {\n                    addOp();\n                  }\n                  attributes[key] = curVal;\n                }\n              } else if (!item.deleted) {\n                oldAttributes.set(key, value);\n                const attr = attributes[key];\n                if (attr !== undefined) {\n                  if (!equalAttrs(attr, value)) {\n                    if (action === 'retain') {\n                      addOp();\n                    }\n                    if (value === null) {\n                      delete attributes[key];\n                    } else {\n                      attributes[key] = value;\n                    }\n                  } else if (attr !== null) { // this will be cleaned up automatically by the contextless cleanup function\n                    item.delete(transaction);\n                  }\n                }\n              }\n              if (!item.deleted) {\n                if (action === 'insert') {\n                  addOp();\n                }\n                updateCurrentAttributes(currentAttributes, /** @type {ContentFormat} */ (item.content));\n              }\n              break\n            }\n          }\n          item = item.right;\n        }\n        addOp();\n        while (delta.length > 0) {\n          const lastOp = delta[delta.length - 1];\n          if (lastOp.retain !== undefined && lastOp.attributes === undefined) {\n            // retain delta's if they don't assign attributes\n            delta.pop();\n          } else {\n            break\n          }\n        }\n      });\n      this._delta = delta;\n    }\n    return /** @type {any} */ (this._delta)\n  }\n}\n\n/**\n * Type that represents text with formatting information.\n *\n * This type replaces y-richtext as this implementation is able to handle\n * block formats (format information on a paragraph), embeds (complex elements\n * like pictures and videos), and text formats (**bold**, *italic*).\n *\n * @extends AbstractType<YTextEvent>\n */\nclass YText extends AbstractType {\n  /**\n   * @param {String} [string] The initial value of the YText.\n   */\n  constructor (string) {\n    super();\n    /**\n     * Array of pending operations on this type\n     * @type {Array<function():void>?}\n     */\n    this._pending = string !== undefined ? [() => this.insert(0, string)] : [];\n    /**\n     * @type {Array<ArraySearchMarker>|null}\n     */\n    this._searchMarker = [];\n    /**\n     * Whether this YText contains formatting attributes.\n     * This flag is updated when a formatting item is integrated (see ContentFormat.integrate)\n     */\n    this._hasFormatting = false;\n  }\n\n  /**\n   * Number of characters of this text type.\n   *\n   * @type {number}\n   */\n  get length () {\n    return this._length\n  }\n\n  /**\n   * @param {Doc} y\n   * @param {Item} item\n   */\n  _integrate (y, item) {\n    super._integrate(y, item);\n    try {\n      /** @type {Array<function>} */ (this._pending).forEach(f => f());\n    } catch (e) {\n      console.error(e);\n    }\n    this._pending = null;\n  }\n\n  _copy () {\n    return new YText()\n  }\n\n  /**\n   * Makes a copy of this data type that can be included somewhere else.\n   *\n   * Note that the content is only readable _after_ it has been included somewhere in the Ydoc.\n   *\n   * @return {YText}\n   */\n  clone () {\n    const text = new YText();\n    text.applyDelta(this.toDelta());\n    return text\n  }\n\n  /**\n   * Creates YTextEvent and calls observers.\n   *\n   * @param {Transaction} transaction\n   * @param {Set<null|string>} parentSubs Keys changed on this type. `null` if list was modified.\n   */\n  _callObserver (transaction, parentSubs) {\n    super._callObserver(transaction, parentSubs);\n    const event = new YTextEvent(this, transaction, parentSubs);\n    callTypeObservers(this, transaction, event);\n    // If a remote change happened, we try to cleanup potential formatting duplicates.\n    if (!transaction.local && this._hasFormatting) {\n      transaction._needFormattingCleanup = true;\n    }\n  }\n\n  /**\n   * Returns the unformatted string representation of this YText type.\n   *\n   * @public\n   */\n  toString () {\n    let str = '';\n    /**\n     * @type {Item|null}\n     */\n    let n = this._start;\n    while (n !== null) {\n      if (!n.deleted && n.countable && n.content.constructor === ContentString) {\n        str += /** @type {ContentString} */ (n.content).str;\n      }\n      n = n.right;\n    }\n    return str\n  }\n\n  /**\n   * Returns the unformatted string representation of this YText type.\n   *\n   * @return {string}\n   * @public\n   */\n  toJSON () {\n    return this.toString()\n  }\n\n  /**\n   * Apply a {@link Delta} on this shared YText type.\n   *\n   * @param {any} delta The changes to apply on this element.\n   * @param {object}  opts\n   * @param {boolean} [opts.sanitize] Sanitize input delta. Removes ending newlines if set to true.\n   *\n   *\n   * @public\n   */\n  applyDelta (delta, { sanitize = true } = {}) {\n    if (this.doc !== null) {\n      transact(this.doc, transaction => {\n        const currPos = new ItemTextListPosition(null, this._start, 0, new Map());\n        for (let i = 0; i < delta.length; i++) {\n          const op = delta[i];\n          if (op.insert !== undefined) {\n            // Quill assumes that the content starts with an empty paragraph.\n            // Yjs/Y.Text assumes that it starts empty. We always hide that\n            // there is a newline at the end of the content.\n            // If we omit this step, clients will see a different number of\n            // paragraphs, but nothing bad will happen.\n            const ins = (!sanitize && typeof op.insert === 'string' && i === delta.length - 1 && currPos.right === null && op.insert.slice(-1) === '\\n') ? op.insert.slice(0, -1) : op.insert;\n            if (typeof ins !== 'string' || ins.length > 0) {\n              insertText(transaction, this, currPos, ins, op.attributes || {});\n            }\n          } else if (op.retain !== undefined) {\n            formatText(transaction, this, currPos, op.retain, op.attributes || {});\n          } else if (op.delete !== undefined) {\n            deleteText(transaction, currPos, op.delete);\n          }\n        }\n      });\n    } else {\n      /** @type {Array<function>} */ (this._pending).push(() => this.applyDelta(delta));\n    }\n  }\n\n  /**\n   * Returns the Delta representation of this YText type.\n   *\n   * @param {Snapshot} [snapshot]\n   * @param {Snapshot} [prevSnapshot]\n   * @param {function('removed' | 'added', ID):any} [computeYChange]\n   * @return {any} The Delta representation of this type.\n   *\n   * @public\n   */\n  toDelta (snapshot, prevSnapshot, computeYChange) {\n    /**\n     * @type{Array<any>}\n     */\n    const ops = [];\n    const currentAttributes = new Map();\n    const doc = /** @type {Doc} */ (this.doc);\n    let str = '';\n    let n = this._start;\n    function packStr () {\n      if (str.length > 0) {\n        // pack str with attributes to ops\n        /**\n         * @type {Object<string,any>}\n         */\n        const attributes = {};\n        let addAttributes = false;\n        currentAttributes.forEach((value, key) => {\n          addAttributes = true;\n          attributes[key] = value;\n        });\n        /**\n         * @type {Object<string,any>}\n         */\n        const op = { insert: str };\n        if (addAttributes) {\n          op.attributes = attributes;\n        }\n        ops.push(op);\n        str = '';\n      }\n    }\n    const computeDelta = () => {\n      while (n !== null) {\n        if (isVisible(n, snapshot) || (prevSnapshot !== undefined && isVisible(n, prevSnapshot))) {\n          switch (n.content.constructor) {\n            case ContentString: {\n              const cur = currentAttributes.get('ychange');\n              if (snapshot !== undefined && !isVisible(n, snapshot)) {\n                if (cur === undefined || cur.user !== n.id.client || cur.type !== 'removed') {\n                  packStr();\n                  currentAttributes.set('ychange', computeYChange ? computeYChange('removed', n.id) : { type: 'removed' });\n                }\n              } else if (prevSnapshot !== undefined && !isVisible(n, prevSnapshot)) {\n                if (cur === undefined || cur.user !== n.id.client || cur.type !== 'added') {\n                  packStr();\n                  currentAttributes.set('ychange', computeYChange ? computeYChange('added', n.id) : { type: 'added' });\n                }\n              } else if (cur !== undefined) {\n                packStr();\n                currentAttributes.delete('ychange');\n              }\n              str += /** @type {ContentString} */ (n.content).str;\n              break\n            }\n            case ContentType:\n            case ContentEmbed: {\n              packStr();\n              /**\n               * @type {Object<string,any>}\n               */\n              const op = {\n                insert: n.content.getContent()[0]\n              };\n              if (currentAttributes.size > 0) {\n                const attrs = /** @type {Object<string,any>} */ ({});\n                op.attributes = attrs;\n                currentAttributes.forEach((value, key) => {\n                  attrs[key] = value;\n                });\n              }\n              ops.push(op);\n              break\n            }\n            case ContentFormat:\n              if (isVisible(n, snapshot)) {\n                packStr();\n                updateCurrentAttributes(currentAttributes, /** @type {ContentFormat} */ (n.content));\n              }\n              break\n          }\n        }\n        n = n.right;\n      }\n      packStr();\n    };\n    if (snapshot || prevSnapshot) {\n      // snapshots are merged again after the transaction, so we need to keep the\n      // transaction alive until we are done\n      transact(doc, transaction => {\n        if (snapshot) {\n          splitSnapshotAffectedStructs(transaction, snapshot);\n        }\n        if (prevSnapshot) {\n          splitSnapshotAffectedStructs(transaction, prevSnapshot);\n        }\n        computeDelta();\n      }, 'cleanup');\n    } else {\n      computeDelta();\n    }\n    return ops\n  }\n\n  /**\n   * Insert text at a given index.\n   *\n   * @param {number} index The index at which to start inserting.\n   * @param {String} text The text to insert at the specified position.\n   * @param {TextAttributes} [attributes] Optionally define some formatting\n   *                                    information to apply on the inserted\n   *                                    Text.\n   * @public\n   */\n  insert (index, text, attributes) {\n    if (text.length <= 0) {\n      return\n    }\n    const y = this.doc;\n    if (y !== null) {\n      transact(y, transaction => {\n        const pos = findPosition(transaction, this, index, !attributes);\n        if (!attributes) {\n          attributes = {};\n          // @ts-ignore\n          pos.currentAttributes.forEach((v, k) => { attributes[k] = v; });\n        }\n        insertText(transaction, this, pos, text, attributes);\n      });\n    } else {\n      /** @type {Array<function>} */ (this._pending).push(() => this.insert(index, text, attributes));\n    }\n  }\n\n  /**\n   * Inserts an embed at a index.\n   *\n   * @param {number} index The index to insert the embed at.\n   * @param {Object | AbstractType<any>} embed The Object that represents the embed.\n   * @param {TextAttributes} [attributes] Attribute information to apply on the\n   *                                    embed\n   *\n   * @public\n   */\n  insertEmbed (index, embed, attributes) {\n    const y = this.doc;\n    if (y !== null) {\n      transact(y, transaction => {\n        const pos = findPosition(transaction, this, index, !attributes);\n        insertText(transaction, this, pos, embed, attributes || {});\n      });\n    } else {\n      /** @type {Array<function>} */ (this._pending).push(() => this.insertEmbed(index, embed, attributes || {}));\n    }\n  }\n\n  /**\n   * Deletes text starting from an index.\n   *\n   * @param {number} index Index at which to start deleting.\n   * @param {number} length The number of characters to remove. Defaults to 1.\n   *\n   * @public\n   */\n  delete (index, length) {\n    if (length === 0) {\n      return\n    }\n    const y = this.doc;\n    if (y !== null) {\n      transact(y, transaction => {\n        deleteText(transaction, findPosition(transaction, this, index, true), length);\n      });\n    } else {\n      /** @type {Array<function>} */ (this._pending).push(() => this.delete(index, length));\n    }\n  }\n\n  /**\n   * Assigns properties to a range of text.\n   *\n   * @param {number} index The position where to start formatting.\n   * @param {number} length The amount of characters to assign properties to.\n   * @param {TextAttributes} attributes Attribute information to apply on the\n   *                                    text.\n   *\n   * @public\n   */\n  format (index, length, attributes) {\n    if (length === 0) {\n      return\n    }\n    const y = this.doc;\n    if (y !== null) {\n      transact(y, transaction => {\n        const pos = findPosition(transaction, this, index, false);\n        if (pos.right === null) {\n          return\n        }\n        formatText(transaction, this, pos, length, attributes);\n      });\n    } else {\n      /** @type {Array<function>} */ (this._pending).push(() => this.format(index, length, attributes));\n    }\n  }\n\n  /**\n   * Removes an attribute.\n   *\n   * @note Xml-Text nodes don't have attributes. You can use this feature to assign properties to complete text-blocks.\n   *\n   * @param {String} attributeName The attribute name that is to be removed.\n   *\n   * @public\n   */\n  removeAttribute (attributeName) {\n    if (this.doc !== null) {\n      transact(this.doc, transaction => {\n        typeMapDelete(transaction, this, attributeName);\n      });\n    } else {\n      /** @type {Array<function>} */ (this._pending).push(() => this.removeAttribute(attributeName));\n    }\n  }\n\n  /**\n   * Sets or updates an attribute.\n   *\n   * @note Xml-Text nodes don't have attributes. You can use this feature to assign properties to complete text-blocks.\n   *\n   * @param {String} attributeName The attribute name that is to be set.\n   * @param {any} attributeValue The attribute value that is to be set.\n   *\n   * @public\n   */\n  setAttribute (attributeName, attributeValue) {\n    if (this.doc !== null) {\n      transact(this.doc, transaction => {\n        typeMapSet(transaction, this, attributeName, attributeValue);\n      });\n    } else {\n      /** @type {Array<function>} */ (this._pending).push(() => this.setAttribute(attributeName, attributeValue));\n    }\n  }\n\n  /**\n   * Returns an attribute value that belongs to the attribute name.\n   *\n   * @note Xml-Text nodes don't have attributes. You can use this feature to assign properties to complete text-blocks.\n   *\n   * @param {String} attributeName The attribute name that identifies the\n   *                               queried value.\n   * @return {any} The queried attribute value.\n   *\n   * @public\n   */\n  getAttribute (attributeName) {\n    return /** @type {any} */ (typeMapGet(this, attributeName))\n  }\n\n  /**\n   * Returns all attribute name/value pairs in a JSON Object.\n   *\n   * @note Xml-Text nodes don't have attributes. You can use this feature to assign properties to complete text-blocks.\n   *\n   * @return {Object<string, any>} A JSON Object that describes the attributes.\n   *\n   * @public\n   */\n  getAttributes () {\n    return typeMapGetAll(this)\n  }\n\n  /**\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n   */\n  _write (encoder) {\n    encoder.writeTypeRef(YTextRefID);\n  }\n}\n\n/**\n * @param {UpdateDecoderV1 | UpdateDecoderV2} _decoder\n * @return {YText}\n *\n * @private\n * @function\n */\nconst readYText = _decoder => new YText();\n\n/**\n * @module YXml\n */\n\n\n/**\n * Define the elements to which a set of CSS queries apply.\n * {@link https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Selectors|CSS_Selectors}\n *\n * @example\n *   query = '.classSelector'\n *   query = 'nodeSelector'\n *   query = '#idSelector'\n *\n * @typedef {string} CSS_Selector\n */\n\n/**\n * Dom filter function.\n *\n * @callback domFilter\n * @param {string} nodeName The nodeName of the element\n * @param {Map} attributes The map of attributes.\n * @return {boolean} Whether to include the Dom node in the YXmlElement.\n */\n\n/**\n * Represents a subset of the nodes of a YXmlElement / YXmlFragment and a\n * position within them.\n *\n * Can be created with {@link YXmlFragment#createTreeWalker}\n *\n * @public\n * @implements {Iterable<YXmlElement|YXmlText|YXmlElement|YXmlHook>}\n */\nclass YXmlTreeWalker {\n  /**\n   * @param {YXmlFragment | YXmlElement} root\n   * @param {function(AbstractType<any>):boolean} [f]\n   */\n  constructor (root, f = () => true) {\n    this._filter = f;\n    this._root = root;\n    /**\n     * @type {Item}\n     */\n    this._currentNode = /** @type {Item} */ (root._start);\n    this._firstCall = true;\n  }\n\n  [Symbol.iterator] () {\n    return this\n  }\n\n  /**\n   * Get the next node.\n   *\n   * @return {IteratorResult<YXmlElement|YXmlText|YXmlHook>} The next node.\n   *\n   * @public\n   */\n  next () {\n    /**\n     * @type {Item|null}\n     */\n    let n = this._currentNode;\n    let type = n && n.content && /** @type {any} */ (n.content).type;\n    if (n !== null && (!this._firstCall || n.deleted || !this._filter(type))) { // if first call, we check if we can use the first item\n      do {\n        type = /** @type {any} */ (n.content).type;\n        if (!n.deleted && (type.constructor === YXmlElement || type.constructor === YXmlFragment) && type._start !== null) {\n          // walk down in the tree\n          n = type._start;\n        } else {\n          // walk right or up in the tree\n          while (n !== null) {\n            if (n.right !== null) {\n              n = n.right;\n              break\n            } else if (n.parent === this._root) {\n              n = null;\n            } else {\n              n = /** @type {AbstractType<any>} */ (n.parent)._item;\n            }\n          }\n        }\n      } while (n !== null && (n.deleted || !this._filter(/** @type {ContentType} */ (n.content).type)))\n    }\n    this._firstCall = false;\n    if (n === null) {\n      // @ts-ignore\n      return { value: undefined, done: true }\n    }\n    this._currentNode = n;\n    return { value: /** @type {any} */ (n.content).type, done: false }\n  }\n}\n\n/**\n * Represents a list of {@link YXmlElement}.and {@link YXmlText} types.\n * A YxmlFragment is similar to a {@link YXmlElement}, but it does not have a\n * nodeName and it does not have attributes. Though it can be bound to a DOM\n * element - in this case the attributes and the nodeName are not shared.\n *\n * @public\n * @extends AbstractType<YXmlEvent>\n */\nclass YXmlFragment extends AbstractType {\n  constructor () {\n    super();\n    /**\n     * @type {Array<any>|null}\n     */\n    this._prelimContent = [];\n  }\n\n  /**\n   * @type {YXmlElement|YXmlText|null}\n   */\n  get firstChild () {\n    const first = this._first;\n    return first ? first.content.getContent()[0] : null\n  }\n\n  /**\n   * Integrate this type into the Yjs instance.\n   *\n   * * Save this struct in the os\n   * * This type is sent to other client\n   * * Observer functions are fired\n   *\n   * @param {Doc} y The Yjs instance\n   * @param {Item} item\n   */\n  _integrate (y, item) {\n    super._integrate(y, item);\n    this.insert(0, /** @type {Array<any>} */ (this._prelimContent));\n    this._prelimContent = null;\n  }\n\n  _copy () {\n    return new YXmlFragment()\n  }\n\n  /**\n   * Makes a copy of this data type that can be included somewhere else.\n   *\n   * Note that the content is only readable _after_ it has been included somewhere in the Ydoc.\n   *\n   * @return {YXmlFragment}\n   */\n  clone () {\n    const el = new YXmlFragment();\n    // @ts-ignore\n    el.insert(0, this.toArray().map(item => item instanceof AbstractType ? item.clone() : item));\n    return el\n  }\n\n  get length () {\n    return this._prelimContent === null ? this._length : this._prelimContent.length\n  }\n\n  /**\n   * Create a subtree of childNodes.\n   *\n   * @example\n   * const walker = elem.createTreeWalker(dom => dom.nodeName === 'div')\n   * for (let node in walker) {\n   *   // `node` is a div node\n   *   nop(node)\n   * }\n   *\n   * @param {function(AbstractType<any>):boolean} filter Function that is called on each child element and\n   *                          returns a Boolean indicating whether the child\n   *                          is to be included in the subtree.\n   * @return {YXmlTreeWalker} A subtree and a position within it.\n   *\n   * @public\n   */\n  createTreeWalker (filter) {\n    return new YXmlTreeWalker(this, filter)\n  }\n\n  /**\n   * Returns the first YXmlElement that matches the query.\n   * Similar to DOM's {@link querySelector}.\n   *\n   * Query support:\n   *   - tagname\n   * TODO:\n   *   - id\n   *   - attribute\n   *\n   * @param {CSS_Selector} query The query on the children.\n   * @return {YXmlElement|YXmlText|YXmlHook|null} The first element that matches the query or null.\n   *\n   * @public\n   */\n  querySelector (query) {\n    query = query.toUpperCase();\n    // @ts-ignore\n    const iterator = new YXmlTreeWalker(this, element => element.nodeName && element.nodeName.toUpperCase() === query);\n    const next = iterator.next();\n    if (next.done) {\n      return null\n    } else {\n      return next.value\n    }\n  }\n\n  /**\n   * Returns all YXmlElements that match the query.\n   * Similar to Dom's {@link querySelectorAll}.\n   *\n   * @todo Does not yet support all queries. Currently only query by tagName.\n   *\n   * @param {CSS_Selector} query The query on the children\n   * @return {Array<YXmlElement|YXmlText|YXmlHook|null>} The elements that match this query.\n   *\n   * @public\n   */\n  querySelectorAll (query) {\n    query = query.toUpperCase();\n    // @ts-ignore\n    return array.from(new YXmlTreeWalker(this, element => element.nodeName && element.nodeName.toUpperCase() === query))\n  }\n\n  /**\n   * Creates YXmlEvent and calls observers.\n   *\n   * @param {Transaction} transaction\n   * @param {Set<null|string>} parentSubs Keys changed on this type. `null` if list was modified.\n   */\n  _callObserver (transaction, parentSubs) {\n    callTypeObservers(this, transaction, new YXmlEvent(this, parentSubs, transaction));\n  }\n\n  /**\n   * Get the string representation of all the children of this YXmlFragment.\n   *\n   * @return {string} The string representation of all children.\n   */\n  toString () {\n    return typeListMap(this, xml => xml.toString()).join('')\n  }\n\n  /**\n   * @return {string}\n   */\n  toJSON () {\n    return this.toString()\n  }\n\n  /**\n   * Creates a Dom Element that mirrors this YXmlElement.\n   *\n   * @param {Document} [_document=document] The document object (you must define\n   *                                        this when calling this method in\n   *                                        nodejs)\n   * @param {Object<string, any>} [hooks={}] Optional property to customize how hooks\n   *                                             are presented in the DOM\n   * @param {any} [binding] You should not set this property. This is\n   *                               used if DomBinding wants to create a\n   *                               association to the created DOM type.\n   * @return {Node} The {@link https://developer.mozilla.org/en-US/docs/Web/API/Element|Dom Element}\n   *\n   * @public\n   */\n  toDOM (_document = document, hooks = {}, binding) {\n    const fragment = _document.createDocumentFragment();\n    if (binding !== undefined) {\n      binding._createAssociation(fragment, this);\n    }\n    typeListForEach(this, xmlType => {\n      fragment.insertBefore(xmlType.toDOM(_document, hooks, binding), null);\n    });\n    return fragment\n  }\n\n  /**\n   * Inserts new content at an index.\n   *\n   * @example\n   *  // Insert character 'a' at position 0\n   *  xml.insert(0, [new Y.XmlText('text')])\n   *\n   * @param {number} index The index to insert content at\n   * @param {Array<YXmlElement|YXmlText>} content The array of content\n   */\n  insert (index, content) {\n    if (this.doc !== null) {\n      transact(this.doc, transaction => {\n        typeListInsertGenerics(transaction, this, index, content);\n      });\n    } else {\n      // @ts-ignore _prelimContent is defined because this is not yet integrated\n      this._prelimContent.splice(index, 0, ...content);\n    }\n  }\n\n  /**\n   * Inserts new content at an index.\n   *\n   * @example\n   *  // Insert character 'a' at position 0\n   *  xml.insert(0, [new Y.XmlText('text')])\n   *\n   * @param {null|Item|YXmlElement|YXmlText} ref The index to insert content at\n   * @param {Array<YXmlElement|YXmlText>} content The array of content\n   */\n  insertAfter (ref, content) {\n    if (this.doc !== null) {\n      transact(this.doc, transaction => {\n        const refItem = (ref && ref instanceof AbstractType) ? ref._item : ref;\n        typeListInsertGenericsAfter(transaction, this, refItem, content);\n      });\n    } else {\n      const pc = /** @type {Array<any>} */ (this._prelimContent);\n      const index = ref === null ? 0 : pc.findIndex(el => el === ref) + 1;\n      if (index === 0 && ref !== null) {\n        throw error.create('Reference item not found')\n      }\n      pc.splice(index, 0, ...content);\n    }\n  }\n\n  /**\n   * Deletes elements starting from an index.\n   *\n   * @param {number} index Index at which to start deleting elements\n   * @param {number} [length=1] The number of elements to remove. Defaults to 1.\n   */\n  delete (index, length = 1) {\n    if (this.doc !== null) {\n      transact(this.doc, transaction => {\n        typeListDelete(transaction, this, index, length);\n      });\n    } else {\n      // @ts-ignore _prelimContent is defined because this is not yet integrated\n      this._prelimContent.splice(index, length);\n    }\n  }\n\n  /**\n   * Transforms this YArray to a JavaScript Array.\n   *\n   * @return {Array<YXmlElement|YXmlText|YXmlHook>}\n   */\n  toArray () {\n    return typeListToArray(this)\n  }\n\n  /**\n   * Appends content to this YArray.\n   *\n   * @param {Array<YXmlElement|YXmlText>} content Array of content to append.\n   */\n  push (content) {\n    this.insert(this.length, content);\n  }\n\n  /**\n   * Prepends content to this YArray.\n   *\n   * @param {Array<YXmlElement|YXmlText>} content Array of content to prepend.\n   */\n  unshift (content) {\n    this.insert(0, content);\n  }\n\n  /**\n   * Returns the i-th element from a YArray.\n   *\n   * @param {number} index The index of the element to return from the YArray\n   * @return {YXmlElement|YXmlText}\n   */\n  get (index) {\n    return typeListGet(this, index)\n  }\n\n  /**\n   * Returns a portion of this YXmlFragment into a JavaScript Array selected\n   * from start to end (end not included).\n   *\n   * @param {number} [start]\n   * @param {number} [end]\n   * @return {Array<YXmlElement|YXmlText>}\n   */\n  slice (start = 0, end = this.length) {\n    return typeListSlice(this, start, end)\n  }\n\n  /**\n   * Executes a provided function on once on every child element.\n   *\n   * @param {function(YXmlElement|YXmlText,number, typeof self):void} f A function to execute on every element of this YArray.\n   */\n  forEach (f) {\n    typeListForEach(this, f);\n  }\n\n  /**\n   * Transform the properties of this type to binary and write it to an\n   * BinaryEncoder.\n   *\n   * This is called when this Item is sent to a remote peer.\n   *\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder The encoder to write data to.\n   */\n  _write (encoder) {\n    encoder.writeTypeRef(YXmlFragmentRefID);\n  }\n}\n\n/**\n * @param {UpdateDecoderV1 | UpdateDecoderV2} _decoder\n * @return {YXmlFragment}\n *\n * @private\n * @function\n */\nconst readYXmlFragment = _decoder => new YXmlFragment();\n\n/**\n * @typedef {Object|number|null|Array<any>|string|Uint8Array|AbstractType<any>} ValueTypes\n */\n\n/**\n * An YXmlElement imitates the behavior of a\n * https://developer.mozilla.org/en-US/docs/Web/API/Element|Dom Element\n *\n * * An YXmlElement has attributes (key value pairs)\n * * An YXmlElement has childElements that must inherit from YXmlElement\n *\n * @template {{ [key: string]: ValueTypes }} [KV={ [key: string]: string }]\n */\nclass YXmlElement extends YXmlFragment {\n  constructor (nodeName = 'UNDEFINED') {\n    super();\n    this.nodeName = nodeName;\n    /**\n     * @type {Map<string, any>|null}\n     */\n    this._prelimAttrs = new Map();\n  }\n\n  /**\n   * @type {YXmlElement|YXmlText|null}\n   */\n  get nextSibling () {\n    const n = this._item ? this._item.next : null;\n    return n ? /** @type {YXmlElement|YXmlText} */ (/** @type {ContentType} */ (n.content).type) : null\n  }\n\n  /**\n   * @type {YXmlElement|YXmlText|null}\n   */\n  get prevSibling () {\n    const n = this._item ? this._item.prev : null;\n    return n ? /** @type {YXmlElement|YXmlText} */ (/** @type {ContentType} */ (n.content).type) : null\n  }\n\n  /**\n   * Integrate this type into the Yjs instance.\n   *\n   * * Save this struct in the os\n   * * This type is sent to other client\n   * * Observer functions are fired\n   *\n   * @param {Doc} y The Yjs instance\n   * @param {Item} item\n   */\n  _integrate (y, item) {\n    super._integrate(y, item)\n    ;(/** @type {Map<string, any>} */ (this._prelimAttrs)).forEach((value, key) => {\n      this.setAttribute(key, value);\n    });\n    this._prelimAttrs = null;\n  }\n\n  /**\n   * Creates an Item with the same effect as this Item (without position effect)\n   *\n   * @return {YXmlElement}\n   */\n  _copy () {\n    return new YXmlElement(this.nodeName)\n  }\n\n  /**\n   * Makes a copy of this data type that can be included somewhere else.\n   *\n   * Note that the content is only readable _after_ it has been included somewhere in the Ydoc.\n   *\n   * @return {YXmlElement<KV>}\n   */\n  clone () {\n    /**\n     * @type {YXmlElement<KV>}\n     */\n    const el = new YXmlElement(this.nodeName);\n    const attrs = this.getAttributes();\n    object.forEach(attrs, (value, key) => {\n      if (typeof value === 'string') {\n        el.setAttribute(key, value);\n      }\n    });\n    // @ts-ignore\n    el.insert(0, this.toArray().map(item => item instanceof AbstractType ? item.clone() : item));\n    return el\n  }\n\n  /**\n   * Returns the XML serialization of this YXmlElement.\n   * The attributes are ordered by attribute-name, so you can easily use this\n   * method to compare YXmlElements\n   *\n   * @return {string} The string representation of this type.\n   *\n   * @public\n   */\n  toString () {\n    const attrs = this.getAttributes();\n    const stringBuilder = [];\n    const keys = [];\n    for (const key in attrs) {\n      keys.push(key);\n    }\n    keys.sort();\n    const keysLen = keys.length;\n    for (let i = 0; i < keysLen; i++) {\n      const key = keys[i];\n      stringBuilder.push(key + '=\"' + attrs[key] + '\"');\n    }\n    const nodeName = this.nodeName.toLocaleLowerCase();\n    const attrsString = stringBuilder.length > 0 ? ' ' + stringBuilder.join(' ') : '';\n    return `<${nodeName}${attrsString}>${super.toString()}</${nodeName}>`\n  }\n\n  /**\n   * Removes an attribute from this YXmlElement.\n   *\n   * @param {string} attributeName The attribute name that is to be removed.\n   *\n   * @public\n   */\n  removeAttribute (attributeName) {\n    if (this.doc !== null) {\n      transact(this.doc, transaction => {\n        typeMapDelete(transaction, this, attributeName);\n      });\n    } else {\n      /** @type {Map<string,any>} */ (this._prelimAttrs).delete(attributeName);\n    }\n  }\n\n  /**\n   * Sets or updates an attribute.\n   *\n   * @template {keyof KV & string} KEY\n   *\n   * @param {KEY} attributeName The attribute name that is to be set.\n   * @param {KV[KEY]} attributeValue The attribute value that is to be set.\n   *\n   * @public\n   */\n  setAttribute (attributeName, attributeValue) {\n    if (this.doc !== null) {\n      transact(this.doc, transaction => {\n        typeMapSet(transaction, this, attributeName, attributeValue);\n      });\n    } else {\n      /** @type {Map<string, any>} */ (this._prelimAttrs).set(attributeName, attributeValue);\n    }\n  }\n\n  /**\n   * Returns an attribute value that belongs to the attribute name.\n   *\n   * @template {keyof KV & string} KEY\n   *\n   * @param {KEY} attributeName The attribute name that identifies the\n   *                               queried value.\n   * @return {KV[KEY]|undefined} The queried attribute value.\n   *\n   * @public\n   */\n  getAttribute (attributeName) {\n    return /** @type {any} */ (typeMapGet(this, attributeName))\n  }\n\n  /**\n   * Returns whether an attribute exists\n   *\n   * @param {string} attributeName The attribute name to check for existence.\n   * @return {boolean} whether the attribute exists.\n   *\n   * @public\n   */\n  hasAttribute (attributeName) {\n    return /** @type {any} */ (typeMapHas(this, attributeName))\n  }\n\n  /**\n   * Returns all attribute name/value pairs in a JSON Object.\n   *\n   * @param {Snapshot} [snapshot]\n   * @return {{ [Key in Extract<keyof KV,string>]?: KV[Key]}} A JSON Object that describes the attributes.\n   *\n   * @public\n   */\n  getAttributes (snapshot) {\n    return /** @type {any} */ (snapshot ? typeMapGetAllSnapshot(this, snapshot) : typeMapGetAll(this))\n  }\n\n  /**\n   * Creates a Dom Element that mirrors this YXmlElement.\n   *\n   * @param {Document} [_document=document] The document object (you must define\n   *                                        this when calling this method in\n   *                                        nodejs)\n   * @param {Object<string, any>} [hooks={}] Optional property to customize how hooks\n   *                                             are presented in the DOM\n   * @param {any} [binding] You should not set this property. This is\n   *                               used if DomBinding wants to create a\n   *                               association to the created DOM type.\n   * @return {Node} The {@link https://developer.mozilla.org/en-US/docs/Web/API/Element|Dom Element}\n   *\n   * @public\n   */\n  toDOM (_document = document, hooks = {}, binding) {\n    const dom = _document.createElement(this.nodeName);\n    const attrs = this.getAttributes();\n    for (const key in attrs) {\n      const value = attrs[key];\n      if (typeof value === 'string') {\n        dom.setAttribute(key, value);\n      }\n    }\n    typeListForEach(this, yxml => {\n      dom.appendChild(yxml.toDOM(_document, hooks, binding));\n    });\n    if (binding !== undefined) {\n      binding._createAssociation(dom, this);\n    }\n    return dom\n  }\n\n  /**\n   * Transform the properties of this type to binary and write it to an\n   * BinaryEncoder.\n   *\n   * This is called when this Item is sent to a remote peer.\n   *\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder The encoder to write data to.\n   */\n  _write (encoder) {\n    encoder.writeTypeRef(YXmlElementRefID);\n    encoder.writeKey(this.nodeName);\n  }\n}\n\n/**\n * @param {UpdateDecoderV1 | UpdateDecoderV2} decoder\n * @return {YXmlElement}\n *\n * @function\n */\nconst readYXmlElement = decoder => new YXmlElement(decoder.readKey());\n\n/**\n * @extends YEvent<YXmlElement|YXmlText|YXmlFragment>\n * An Event that describes changes on a YXml Element or Yxml Fragment\n */\nclass YXmlEvent extends YEvent {\n  /**\n   * @param {YXmlElement|YXmlText|YXmlFragment} target The target on which the event is created.\n   * @param {Set<string|null>} subs The set of changed attributes. `null` is included if the\n   *                   child list changed.\n   * @param {Transaction} transaction The transaction instance with wich the\n   *                                  change was created.\n   */\n  constructor (target, subs, transaction) {\n    super(target, transaction);\n    /**\n     * Whether the children changed.\n     * @type {Boolean}\n     * @private\n     */\n    this.childListChanged = false;\n    /**\n     * Set of all changed attributes.\n     * @type {Set<string>}\n     */\n    this.attributesChanged = new Set();\n    subs.forEach((sub) => {\n      if (sub === null) {\n        this.childListChanged = true;\n      } else {\n        this.attributesChanged.add(sub);\n      }\n    });\n  }\n}\n\n/**\n * You can manage binding to a custom type with YXmlHook.\n *\n * @extends {YMap<any>}\n */\nclass YXmlHook extends YMap {\n  /**\n   * @param {string} hookName nodeName of the Dom Node.\n   */\n  constructor (hookName) {\n    super();\n    /**\n     * @type {string}\n     */\n    this.hookName = hookName;\n  }\n\n  /**\n   * Creates an Item with the same effect as this Item (without position effect)\n   */\n  _copy () {\n    return new YXmlHook(this.hookName)\n  }\n\n  /**\n   * Makes a copy of this data type that can be included somewhere else.\n   *\n   * Note that the content is only readable _after_ it has been included somewhere in the Ydoc.\n   *\n   * @return {YXmlHook}\n   */\n  clone () {\n    const el = new YXmlHook(this.hookName);\n    this.forEach((value, key) => {\n      el.set(key, value);\n    });\n    return el\n  }\n\n  /**\n   * Creates a Dom Element that mirrors this YXmlElement.\n   *\n   * @param {Document} [_document=document] The document object (you must define\n   *                                        this when calling this method in\n   *                                        nodejs)\n   * @param {Object.<string, any>} [hooks] Optional property to customize how hooks\n   *                                             are presented in the DOM\n   * @param {any} [binding] You should not set this property. This is\n   *                               used if DomBinding wants to create a\n   *                               association to the created DOM type\n   * @return {Element} The {@link https://developer.mozilla.org/en-US/docs/Web/API/Element|Dom Element}\n   *\n   * @public\n   */\n  toDOM (_document = document, hooks = {}, binding) {\n    const hook = hooks[this.hookName];\n    let dom;\n    if (hook !== undefined) {\n      dom = hook.createDom(this);\n    } else {\n      dom = document.createElement(this.hookName);\n    }\n    dom.setAttribute('data-yjs-hook', this.hookName);\n    if (binding !== undefined) {\n      binding._createAssociation(dom, this);\n    }\n    return dom\n  }\n\n  /**\n   * Transform the properties of this type to binary and write it to an\n   * BinaryEncoder.\n   *\n   * This is called when this Item is sent to a remote peer.\n   *\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder The encoder to write data to.\n   */\n  _write (encoder) {\n    encoder.writeTypeRef(YXmlHookRefID);\n    encoder.writeKey(this.hookName);\n  }\n}\n\n/**\n * @param {UpdateDecoderV1 | UpdateDecoderV2} decoder\n * @return {YXmlHook}\n *\n * @private\n * @function\n */\nconst readYXmlHook = decoder =>\n  new YXmlHook(decoder.readKey());\n\n/**\n * Represents text in a Dom Element. In the future this type will also handle\n * simple formatting information like bold and italic.\n */\nclass YXmlText extends YText {\n  /**\n   * @type {YXmlElement|YXmlText|null}\n   */\n  get nextSibling () {\n    const n = this._item ? this._item.next : null;\n    return n ? /** @type {YXmlElement|YXmlText} */ (/** @type {ContentType} */ (n.content).type) : null\n  }\n\n  /**\n   * @type {YXmlElement|YXmlText|null}\n   */\n  get prevSibling () {\n    const n = this._item ? this._item.prev : null;\n    return n ? /** @type {YXmlElement|YXmlText} */ (/** @type {ContentType} */ (n.content).type) : null\n  }\n\n  _copy () {\n    return new YXmlText()\n  }\n\n  /**\n   * Makes a copy of this data type that can be included somewhere else.\n   *\n   * Note that the content is only readable _after_ it has been included somewhere in the Ydoc.\n   *\n   * @return {YXmlText}\n   */\n  clone () {\n    const text = new YXmlText();\n    text.applyDelta(this.toDelta());\n    return text\n  }\n\n  /**\n   * Creates a Dom Element that mirrors this YXmlText.\n   *\n   * @param {Document} [_document=document] The document object (you must define\n   *                                        this when calling this method in\n   *                                        nodejs)\n   * @param {Object<string, any>} [hooks] Optional property to customize how hooks\n   *                                             are presented in the DOM\n   * @param {any} [binding] You should not set this property. This is\n   *                               used if DomBinding wants to create a\n   *                               association to the created DOM type.\n   * @return {Text} The {@link https://developer.mozilla.org/en-US/docs/Web/API/Element|Dom Element}\n   *\n   * @public\n   */\n  toDOM (_document = document, hooks, binding) {\n    const dom = _document.createTextNode(this.toString());\n    if (binding !== undefined) {\n      binding._createAssociation(dom, this);\n    }\n    return dom\n  }\n\n  toString () {\n    // @ts-ignore\n    return this.toDelta().map(delta => {\n      const nestedNodes = [];\n      for (const nodeName in delta.attributes) {\n        const attrs = [];\n        for (const key in delta.attributes[nodeName]) {\n          attrs.push({ key, value: delta.attributes[nodeName][key] });\n        }\n        // sort attributes to get a unique order\n        attrs.sort((a, b) => a.key < b.key ? -1 : 1);\n        nestedNodes.push({ nodeName, attrs });\n      }\n      // sort node order to get a unique order\n      nestedNodes.sort((a, b) => a.nodeName < b.nodeName ? -1 : 1);\n      // now convert to dom string\n      let str = '';\n      for (let i = 0; i < nestedNodes.length; i++) {\n        const node = nestedNodes[i];\n        str += `<${node.nodeName}`;\n        for (let j = 0; j < node.attrs.length; j++) {\n          const attr = node.attrs[j];\n          str += ` ${attr.key}=\"${attr.value}\"`;\n        }\n        str += '>';\n      }\n      str += delta.insert;\n      for (let i = nestedNodes.length - 1; i >= 0; i--) {\n        str += `</${nestedNodes[i].nodeName}>`;\n      }\n      return str\n    }).join('')\n  }\n\n  /**\n   * @return {string}\n   */\n  toJSON () {\n    return this.toString()\n  }\n\n  /**\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n   */\n  _write (encoder) {\n    encoder.writeTypeRef(YXmlTextRefID);\n  }\n}\n\n/**\n * @param {UpdateDecoderV1 | UpdateDecoderV2} decoder\n * @return {YXmlText}\n *\n * @private\n * @function\n */\nconst readYXmlText = decoder => new YXmlText();\n\nclass AbstractStruct {\n  /**\n   * @param {ID} id\n   * @param {number} length\n   */\n  constructor (id, length) {\n    this.id = id;\n    this.length = length;\n  }\n\n  /**\n   * @type {boolean}\n   */\n  get deleted () {\n    throw error.methodUnimplemented()\n  }\n\n  /**\n   * Merge this struct with the item to the right.\n   * This method is already assuming that `this.id.clock + this.length === this.id.clock`.\n   * Also this method does *not* remove right from StructStore!\n   * @param {AbstractStruct} right\n   * @return {boolean} wether this merged with right\n   */\n  mergeWith (right) {\n    return false\n  }\n\n  /**\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder The encoder to write data to.\n   * @param {number} offset\n   * @param {number} encodingRef\n   */\n  write (encoder, offset, encodingRef) {\n    throw error.methodUnimplemented()\n  }\n\n  /**\n   * @param {Transaction} transaction\n   * @param {number} offset\n   */\n  integrate (transaction, offset) {\n    throw error.methodUnimplemented()\n  }\n}\n\nconst structGCRefNumber = 0;\n\n/**\n * @private\n */\nclass GC extends AbstractStruct {\n  get deleted () {\n    return true\n  }\n\n  delete () {}\n\n  /**\n   * @param {GC} right\n   * @return {boolean}\n   */\n  mergeWith (right) {\n    if (this.constructor !== right.constructor) {\n      return false\n    }\n    this.length += right.length;\n    return true\n  }\n\n  /**\n   * @param {Transaction} transaction\n   * @param {number} offset\n   */\n  integrate (transaction, offset) {\n    if (offset > 0) {\n      this.id.clock += offset;\n      this.length -= offset;\n    }\n    addStruct(transaction.doc.store, this);\n  }\n\n  /**\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n   * @param {number} offset\n   */\n  write (encoder, offset) {\n    encoder.writeInfo(structGCRefNumber);\n    encoder.writeLen(this.length - offset);\n  }\n\n  /**\n   * @param {Transaction} transaction\n   * @param {StructStore} store\n   * @return {null | number}\n   */\n  getMissing (transaction, store) {\n    return null\n  }\n}\n\nclass ContentBinary {\n  /**\n   * @param {Uint8Array} content\n   */\n  constructor (content) {\n    this.content = content;\n  }\n\n  /**\n   * @return {number}\n   */\n  getLength () {\n    return 1\n  }\n\n  /**\n   * @return {Array<any>}\n   */\n  getContent () {\n    return [this.content]\n  }\n\n  /**\n   * @return {boolean}\n   */\n  isCountable () {\n    return true\n  }\n\n  /**\n   * @return {ContentBinary}\n   */\n  copy () {\n    return new ContentBinary(this.content)\n  }\n\n  /**\n   * @param {number} offset\n   * @return {ContentBinary}\n   */\n  splice (offset) {\n    throw error.methodUnimplemented()\n  }\n\n  /**\n   * @param {ContentBinary} right\n   * @return {boolean}\n   */\n  mergeWith (right) {\n    return false\n  }\n\n  /**\n   * @param {Transaction} transaction\n   * @param {Item} item\n   */\n  integrate (transaction, item) {}\n  /**\n   * @param {Transaction} transaction\n   */\n  delete (transaction) {}\n  /**\n   * @param {StructStore} store\n   */\n  gc (store) {}\n  /**\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n   * @param {number} offset\n   */\n  write (encoder, offset) {\n    encoder.writeBuf(this.content);\n  }\n\n  /**\n   * @return {number}\n   */\n  getRef () {\n    return 3\n  }\n}\n\n/**\n * @param {UpdateDecoderV1 | UpdateDecoderV2 } decoder\n * @return {ContentBinary}\n */\nconst readContentBinary = decoder => new ContentBinary(decoder.readBuf());\n\nclass ContentDeleted {\n  /**\n   * @param {number} len\n   */\n  constructor (len) {\n    this.len = len;\n  }\n\n  /**\n   * @return {number}\n   */\n  getLength () {\n    return this.len\n  }\n\n  /**\n   * @return {Array<any>}\n   */\n  getContent () {\n    return []\n  }\n\n  /**\n   * @return {boolean}\n   */\n  isCountable () {\n    return false\n  }\n\n  /**\n   * @return {ContentDeleted}\n   */\n  copy () {\n    return new ContentDeleted(this.len)\n  }\n\n  /**\n   * @param {number} offset\n   * @return {ContentDeleted}\n   */\n  splice (offset) {\n    const right = new ContentDeleted(this.len - offset);\n    this.len = offset;\n    return right\n  }\n\n  /**\n   * @param {ContentDeleted} right\n   * @return {boolean}\n   */\n  mergeWith (right) {\n    this.len += right.len;\n    return true\n  }\n\n  /**\n   * @param {Transaction} transaction\n   * @param {Item} item\n   */\n  integrate (transaction, item) {\n    addToDeleteSet(transaction.deleteSet, item.id.client, item.id.clock, this.len);\n    item.markDeleted();\n  }\n\n  /**\n   * @param {Transaction} transaction\n   */\n  delete (transaction) {}\n  /**\n   * @param {StructStore} store\n   */\n  gc (store) {}\n  /**\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n   * @param {number} offset\n   */\n  write (encoder, offset) {\n    encoder.writeLen(this.len - offset);\n  }\n\n  /**\n   * @return {number}\n   */\n  getRef () {\n    return 1\n  }\n}\n\n/**\n * @private\n *\n * @param {UpdateDecoderV1 | UpdateDecoderV2 } decoder\n * @return {ContentDeleted}\n */\nconst readContentDeleted = decoder => new ContentDeleted(decoder.readLen());\n\n/**\n * @param {string} guid\n * @param {Object<string, any>} opts\n */\nconst createDocFromOpts = (guid, opts) => new Doc({ guid, ...opts, shouldLoad: opts.shouldLoad || opts.autoLoad || false });\n\n/**\n * @private\n */\nclass ContentDoc {\n  /**\n   * @param {Doc} doc\n   */\n  constructor (doc) {\n    if (doc._item) {\n      console.error('This document was already integrated as a sub-document. You should create a second instance instead with the same guid.');\n    }\n    /**\n     * @type {Doc}\n     */\n    this.doc = doc;\n    /**\n     * @type {any}\n     */\n    const opts = {};\n    this.opts = opts;\n    if (!doc.gc) {\n      opts.gc = false;\n    }\n    if (doc.autoLoad) {\n      opts.autoLoad = true;\n    }\n    if (doc.meta !== null) {\n      opts.meta = doc.meta;\n    }\n  }\n\n  /**\n   * @return {number}\n   */\n  getLength () {\n    return 1\n  }\n\n  /**\n   * @return {Array<any>}\n   */\n  getContent () {\n    return [this.doc]\n  }\n\n  /**\n   * @return {boolean}\n   */\n  isCountable () {\n    return true\n  }\n\n  /**\n   * @return {ContentDoc}\n   */\n  copy () {\n    return new ContentDoc(createDocFromOpts(this.doc.guid, this.opts))\n  }\n\n  /**\n   * @param {number} offset\n   * @return {ContentDoc}\n   */\n  splice (offset) {\n    throw error.methodUnimplemented()\n  }\n\n  /**\n   * @param {ContentDoc} right\n   * @return {boolean}\n   */\n  mergeWith (right) {\n    return false\n  }\n\n  /**\n   * @param {Transaction} transaction\n   * @param {Item} item\n   */\n  integrate (transaction, item) {\n    // this needs to be reflected in doc.destroy as well\n    this.doc._item = item;\n    transaction.subdocsAdded.add(this.doc);\n    if (this.doc.shouldLoad) {\n      transaction.subdocsLoaded.add(this.doc);\n    }\n  }\n\n  /**\n   * @param {Transaction} transaction\n   */\n  delete (transaction) {\n    if (transaction.subdocsAdded.has(this.doc)) {\n      transaction.subdocsAdded.delete(this.doc);\n    } else {\n      transaction.subdocsRemoved.add(this.doc);\n    }\n  }\n\n  /**\n   * @param {StructStore} store\n   */\n  gc (store) { }\n\n  /**\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n   * @param {number} offset\n   */\n  write (encoder, offset) {\n    encoder.writeString(this.doc.guid);\n    encoder.writeAny(this.opts);\n  }\n\n  /**\n   * @return {number}\n   */\n  getRef () {\n    return 9\n  }\n}\n\n/**\n * @private\n *\n * @param {UpdateDecoderV1 | UpdateDecoderV2} decoder\n * @return {ContentDoc}\n */\nconst readContentDoc = decoder => new ContentDoc(createDocFromOpts(decoder.readString(), decoder.readAny()));\n\n/**\n * @private\n */\nclass ContentEmbed {\n  /**\n   * @param {Object} embed\n   */\n  constructor (embed) {\n    this.embed = embed;\n  }\n\n  /**\n   * @return {number}\n   */\n  getLength () {\n    return 1\n  }\n\n  /**\n   * @return {Array<any>}\n   */\n  getContent () {\n    return [this.embed]\n  }\n\n  /**\n   * @return {boolean}\n   */\n  isCountable () {\n    return true\n  }\n\n  /**\n   * @return {ContentEmbed}\n   */\n  copy () {\n    return new ContentEmbed(this.embed)\n  }\n\n  /**\n   * @param {number} offset\n   * @return {ContentEmbed}\n   */\n  splice (offset) {\n    throw error.methodUnimplemented()\n  }\n\n  /**\n   * @param {ContentEmbed} right\n   * @return {boolean}\n   */\n  mergeWith (right) {\n    return false\n  }\n\n  /**\n   * @param {Transaction} transaction\n   * @param {Item} item\n   */\n  integrate (transaction, item) {}\n  /**\n   * @param {Transaction} transaction\n   */\n  delete (transaction) {}\n  /**\n   * @param {StructStore} store\n   */\n  gc (store) {}\n  /**\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n   * @param {number} offset\n   */\n  write (encoder, offset) {\n    encoder.writeJSON(this.embed);\n  }\n\n  /**\n   * @return {number}\n   */\n  getRef () {\n    return 5\n  }\n}\n\n/**\n * @private\n *\n * @param {UpdateDecoderV1 | UpdateDecoderV2} decoder\n * @return {ContentEmbed}\n */\nconst readContentEmbed = decoder => new ContentEmbed(decoder.readJSON());\n\n/**\n * @private\n */\nclass ContentFormat {\n  /**\n   * @param {string} key\n   * @param {Object} value\n   */\n  constructor (key, value) {\n    this.key = key;\n    this.value = value;\n  }\n\n  /**\n   * @return {number}\n   */\n  getLength () {\n    return 1\n  }\n\n  /**\n   * @return {Array<any>}\n   */\n  getContent () {\n    return []\n  }\n\n  /**\n   * @return {boolean}\n   */\n  isCountable () {\n    return false\n  }\n\n  /**\n   * @return {ContentFormat}\n   */\n  copy () {\n    return new ContentFormat(this.key, this.value)\n  }\n\n  /**\n   * @param {number} _offset\n   * @return {ContentFormat}\n   */\n  splice (_offset) {\n    throw error.methodUnimplemented()\n  }\n\n  /**\n   * @param {ContentFormat} _right\n   * @return {boolean}\n   */\n  mergeWith (_right) {\n    return false\n  }\n\n  /**\n   * @param {Transaction} _transaction\n   * @param {Item} item\n   */\n  integrate (_transaction, item) {\n    // @todo searchmarker are currently unsupported for rich text documents\n    const p = /** @type {YText} */ (item.parent);\n    p._searchMarker = null;\n    p._hasFormatting = true;\n  }\n\n  /**\n   * @param {Transaction} transaction\n   */\n  delete (transaction) {}\n  /**\n   * @param {StructStore} store\n   */\n  gc (store) {}\n  /**\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n   * @param {number} offset\n   */\n  write (encoder, offset) {\n    encoder.writeKey(this.key);\n    encoder.writeJSON(this.value);\n  }\n\n  /**\n   * @return {number}\n   */\n  getRef () {\n    return 6\n  }\n}\n\n/**\n * @param {UpdateDecoderV1 | UpdateDecoderV2} decoder\n * @return {ContentFormat}\n */\nconst readContentFormat = decoder => new ContentFormat(decoder.readKey(), decoder.readJSON());\n\n/**\n * @private\n */\nclass ContentJSON {\n  /**\n   * @param {Array<any>} arr\n   */\n  constructor (arr) {\n    /**\n     * @type {Array<any>}\n     */\n    this.arr = arr;\n  }\n\n  /**\n   * @return {number}\n   */\n  getLength () {\n    return this.arr.length\n  }\n\n  /**\n   * @return {Array<any>}\n   */\n  getContent () {\n    return this.arr\n  }\n\n  /**\n   * @return {boolean}\n   */\n  isCountable () {\n    return true\n  }\n\n  /**\n   * @return {ContentJSON}\n   */\n  copy () {\n    return new ContentJSON(this.arr)\n  }\n\n  /**\n   * @param {number} offset\n   * @return {ContentJSON}\n   */\n  splice (offset) {\n    const right = new ContentJSON(this.arr.slice(offset));\n    this.arr = this.arr.slice(0, offset);\n    return right\n  }\n\n  /**\n   * @param {ContentJSON} right\n   * @return {boolean}\n   */\n  mergeWith (right) {\n    this.arr = this.arr.concat(right.arr);\n    return true\n  }\n\n  /**\n   * @param {Transaction} transaction\n   * @param {Item} item\n   */\n  integrate (transaction, item) {}\n  /**\n   * @param {Transaction} transaction\n   */\n  delete (transaction) {}\n  /**\n   * @param {StructStore} store\n   */\n  gc (store) {}\n  /**\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n   * @param {number} offset\n   */\n  write (encoder, offset) {\n    const len = this.arr.length;\n    encoder.writeLen(len - offset);\n    for (let i = offset; i < len; i++) {\n      const c = this.arr[i];\n      encoder.writeString(c === undefined ? 'undefined' : JSON.stringify(c));\n    }\n  }\n\n  /**\n   * @return {number}\n   */\n  getRef () {\n    return 2\n  }\n}\n\n/**\n * @private\n *\n * @param {UpdateDecoderV1 | UpdateDecoderV2} decoder\n * @return {ContentJSON}\n */\nconst readContentJSON = decoder => {\n  const len = decoder.readLen();\n  const cs = [];\n  for (let i = 0; i < len; i++) {\n    const c = decoder.readString();\n    if (c === 'undefined') {\n      cs.push(undefined);\n    } else {\n      cs.push(JSON.parse(c));\n    }\n  }\n  return new ContentJSON(cs)\n};\n\nclass ContentAny {\n  /**\n   * @param {Array<any>} arr\n   */\n  constructor (arr) {\n    /**\n     * @type {Array<any>}\n     */\n    this.arr = arr;\n  }\n\n  /**\n   * @return {number}\n   */\n  getLength () {\n    return this.arr.length\n  }\n\n  /**\n   * @return {Array<any>}\n   */\n  getContent () {\n    return this.arr\n  }\n\n  /**\n   * @return {boolean}\n   */\n  isCountable () {\n    return true\n  }\n\n  /**\n   * @return {ContentAny}\n   */\n  copy () {\n    return new ContentAny(this.arr)\n  }\n\n  /**\n   * @param {number} offset\n   * @return {ContentAny}\n   */\n  splice (offset) {\n    const right = new ContentAny(this.arr.slice(offset));\n    this.arr = this.arr.slice(0, offset);\n    return right\n  }\n\n  /**\n   * @param {ContentAny} right\n   * @return {boolean}\n   */\n  mergeWith (right) {\n    this.arr = this.arr.concat(right.arr);\n    return true\n  }\n\n  /**\n   * @param {Transaction} transaction\n   * @param {Item} item\n   */\n  integrate (transaction, item) {}\n  /**\n   * @param {Transaction} transaction\n   */\n  delete (transaction) {}\n  /**\n   * @param {StructStore} store\n   */\n  gc (store) {}\n  /**\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n   * @param {number} offset\n   */\n  write (encoder, offset) {\n    const len = this.arr.length;\n    encoder.writeLen(len - offset);\n    for (let i = offset; i < len; i++) {\n      const c = this.arr[i];\n      encoder.writeAny(c);\n    }\n  }\n\n  /**\n   * @return {number}\n   */\n  getRef () {\n    return 8\n  }\n}\n\n/**\n * @param {UpdateDecoderV1 | UpdateDecoderV2} decoder\n * @return {ContentAny}\n */\nconst readContentAny = decoder => {\n  const len = decoder.readLen();\n  const cs = [];\n  for (let i = 0; i < len; i++) {\n    cs.push(decoder.readAny());\n  }\n  return new ContentAny(cs)\n};\n\n/**\n * @private\n */\nclass ContentString {\n  /**\n   * @param {string} str\n   */\n  constructor (str) {\n    /**\n     * @type {string}\n     */\n    this.str = str;\n  }\n\n  /**\n   * @return {number}\n   */\n  getLength () {\n    return this.str.length\n  }\n\n  /**\n   * @return {Array<any>}\n   */\n  getContent () {\n    return this.str.split('')\n  }\n\n  /**\n   * @return {boolean}\n   */\n  isCountable () {\n    return true\n  }\n\n  /**\n   * @return {ContentString}\n   */\n  copy () {\n    return new ContentString(this.str)\n  }\n\n  /**\n   * @param {number} offset\n   * @return {ContentString}\n   */\n  splice (offset) {\n    const right = new ContentString(this.str.slice(offset));\n    this.str = this.str.slice(0, offset);\n\n    // Prevent encoding invalid documents because of splitting of surrogate pairs: https://github.com/yjs/yjs/issues/248\n    const firstCharCode = this.str.charCodeAt(offset - 1);\n    if (firstCharCode >= 0xD800 && firstCharCode <= 0xDBFF) {\n      // Last character of the left split is the start of a surrogate utf16/ucs2 pair.\n      // We don't support splitting of surrogate pairs because this may lead to invalid documents.\n      // Replace the invalid character with a unicode replacement character (� / U+FFFD)\n      this.str = this.str.slice(0, offset - 1) + '�';\n      // replace right as well\n      right.str = '�' + right.str.slice(1);\n    }\n    return right\n  }\n\n  /**\n   * @param {ContentString} right\n   * @return {boolean}\n   */\n  mergeWith (right) {\n    this.str += right.str;\n    return true\n  }\n\n  /**\n   * @param {Transaction} transaction\n   * @param {Item} item\n   */\n  integrate (transaction, item) {}\n  /**\n   * @param {Transaction} transaction\n   */\n  delete (transaction) {}\n  /**\n   * @param {StructStore} store\n   */\n  gc (store) {}\n  /**\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n   * @param {number} offset\n   */\n  write (encoder, offset) {\n    encoder.writeString(offset === 0 ? this.str : this.str.slice(offset));\n  }\n\n  /**\n   * @return {number}\n   */\n  getRef () {\n    return 4\n  }\n}\n\n/**\n * @private\n *\n * @param {UpdateDecoderV1 | UpdateDecoderV2} decoder\n * @return {ContentString}\n */\nconst readContentString = decoder => new ContentString(decoder.readString());\n\n/**\n * @type {Array<function(UpdateDecoderV1 | UpdateDecoderV2):AbstractType<any>>}\n * @private\n */\nconst typeRefs = [\n  readYArray,\n  readYMap,\n  readYText,\n  readYXmlElement,\n  readYXmlFragment,\n  readYXmlHook,\n  readYXmlText\n];\n\nconst YArrayRefID = 0;\nconst YMapRefID = 1;\nconst YTextRefID = 2;\nconst YXmlElementRefID = 3;\nconst YXmlFragmentRefID = 4;\nconst YXmlHookRefID = 5;\nconst YXmlTextRefID = 6;\n\n/**\n * @private\n */\nclass ContentType {\n  /**\n   * @param {AbstractType<any>} type\n   */\n  constructor (type) {\n    /**\n     * @type {AbstractType<any>}\n     */\n    this.type = type;\n  }\n\n  /**\n   * @return {number}\n   */\n  getLength () {\n    return 1\n  }\n\n  /**\n   * @return {Array<any>}\n   */\n  getContent () {\n    return [this.type]\n  }\n\n  /**\n   * @return {boolean}\n   */\n  isCountable () {\n    return true\n  }\n\n  /**\n   * @return {ContentType}\n   */\n  copy () {\n    return new ContentType(this.type._copy())\n  }\n\n  /**\n   * @param {number} offset\n   * @return {ContentType}\n   */\n  splice (offset) {\n    throw error.methodUnimplemented()\n  }\n\n  /**\n   * @param {ContentType} right\n   * @return {boolean}\n   */\n  mergeWith (right) {\n    return false\n  }\n\n  /**\n   * @param {Transaction} transaction\n   * @param {Item} item\n   */\n  integrate (transaction, item) {\n    this.type._integrate(transaction.doc, item);\n  }\n\n  /**\n   * @param {Transaction} transaction\n   */\n  delete (transaction) {\n    let item = this.type._start;\n    while (item !== null) {\n      if (!item.deleted) {\n        item.delete(transaction);\n      } else if (item.id.clock < (transaction.beforeState.get(item.id.client) || 0)) {\n        // This will be gc'd later and we want to merge it if possible\n        // We try to merge all deleted items after each transaction,\n        // but we have no knowledge about that this needs to be merged\n        // since it is not in transaction.ds. Hence we add it to transaction._mergeStructs\n        transaction._mergeStructs.push(item);\n      }\n      item = item.right;\n    }\n    this.type._map.forEach(item => {\n      if (!item.deleted) {\n        item.delete(transaction);\n      } else if (item.id.clock < (transaction.beforeState.get(item.id.client) || 0)) {\n        // same as above\n        transaction._mergeStructs.push(item);\n      }\n    });\n    transaction.changed.delete(this.type);\n  }\n\n  /**\n   * @param {StructStore} store\n   */\n  gc (store) {\n    let item = this.type._start;\n    while (item !== null) {\n      item.gc(store, true);\n      item = item.right;\n    }\n    this.type._start = null;\n    this.type._map.forEach(/** @param {Item | null} item */ (item) => {\n      while (item !== null) {\n        item.gc(store, true);\n        item = item.left;\n      }\n    });\n    this.type._map = new Map();\n  }\n\n  /**\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n   * @param {number} offset\n   */\n  write (encoder, offset) {\n    this.type._write(encoder);\n  }\n\n  /**\n   * @return {number}\n   */\n  getRef () {\n    return 7\n  }\n}\n\n/**\n * @private\n *\n * @param {UpdateDecoderV1 | UpdateDecoderV2} decoder\n * @return {ContentType}\n */\nconst readContentType = decoder => new ContentType(typeRefs[decoder.readTypeRef()](decoder));\n\n/**\n * @todo This should return several items\n *\n * @param {StructStore} store\n * @param {ID} id\n * @return {{item:Item, diff:number}}\n */\nconst followRedone = (store, id) => {\n  /**\n   * @type {ID|null}\n   */\n  let nextID = id;\n  let diff = 0;\n  let item;\n  do {\n    if (diff > 0) {\n      nextID = createID(nextID.client, nextID.clock + diff);\n    }\n    item = getItem(store, nextID);\n    diff = nextID.clock - item.id.clock;\n    nextID = item.redone;\n  } while (nextID !== null && item instanceof Item)\n  return {\n    item, diff\n  }\n};\n\n/**\n * Make sure that neither item nor any of its parents is ever deleted.\n *\n * This property does not persist when storing it into a database or when\n * sending it to other peers\n *\n * @param {Item|null} item\n * @param {boolean} keep\n */\nconst keepItem = (item, keep) => {\n  while (item !== null && item.keep !== keep) {\n    item.keep = keep;\n    item = /** @type {AbstractType<any>} */ (item.parent)._item;\n  }\n};\n\n/**\n * Split leftItem into two items\n * @param {Transaction} transaction\n * @param {Item} leftItem\n * @param {number} diff\n * @return {Item}\n *\n * @function\n * @private\n */\nconst splitItem = (transaction, leftItem, diff) => {\n  // create rightItem\n  const { client, clock } = leftItem.id;\n  const rightItem = new Item(\n    createID(client, clock + diff),\n    leftItem,\n    createID(client, clock + diff - 1),\n    leftItem.right,\n    leftItem.rightOrigin,\n    leftItem.parent,\n    leftItem.parentSub,\n    leftItem.content.splice(diff)\n  );\n  if (leftItem.deleted) {\n    rightItem.markDeleted();\n  }\n  if (leftItem.keep) {\n    rightItem.keep = true;\n  }\n  if (leftItem.redone !== null) {\n    rightItem.redone = createID(leftItem.redone.client, leftItem.redone.clock + diff);\n  }\n  // update left (do not set leftItem.rightOrigin as it will lead to problems when syncing)\n  leftItem.right = rightItem;\n  // update right\n  if (rightItem.right !== null) {\n    rightItem.right.left = rightItem;\n  }\n  // right is more specific.\n  transaction._mergeStructs.push(rightItem);\n  // update parent._map\n  if (rightItem.parentSub !== null && rightItem.right === null) {\n    /** @type {AbstractType<any>} */ (rightItem.parent)._map.set(rightItem.parentSub, rightItem);\n  }\n  leftItem.length = diff;\n  return rightItem\n};\n\n/**\n * @param {Array<StackItem>} stack\n * @param {ID} id\n */\nconst isDeletedByUndoStack = (stack, id) => array.some(stack, /** @param {StackItem} s */ s => isDeleted(s.deletions, id));\n\n/**\n * Redoes the effect of this operation.\n *\n * @param {Transaction} transaction The Yjs instance.\n * @param {Item} item\n * @param {Set<Item>} redoitems\n * @param {DeleteSet} itemsToDelete\n * @param {boolean} ignoreRemoteMapChanges\n * @param {import('../utils/UndoManager.js').UndoManager} um\n *\n * @return {Item|null}\n *\n * @private\n */\nconst redoItem = (transaction, item, redoitems, itemsToDelete, ignoreRemoteMapChanges, um) => {\n  const doc = transaction.doc;\n  const store = doc.store;\n  const ownClientID = doc.clientID;\n  const redone = item.redone;\n  if (redone !== null) {\n    return getItemCleanStart(transaction, redone)\n  }\n  let parentItem = /** @type {AbstractType<any>} */ (item.parent)._item;\n  /**\n   * @type {Item|null}\n   */\n  let left = null;\n  /**\n   * @type {Item|null}\n   */\n  let right;\n  // make sure that parent is redone\n  if (parentItem !== null && parentItem.deleted === true) {\n    // try to undo parent if it will be undone anyway\n    if (parentItem.redone === null && (!redoitems.has(parentItem) || redoItem(transaction, parentItem, redoitems, itemsToDelete, ignoreRemoteMapChanges, um) === null)) {\n      return null\n    }\n    while (parentItem.redone !== null) {\n      parentItem = getItemCleanStart(transaction, parentItem.redone);\n    }\n  }\n  const parentType = parentItem === null ? /** @type {AbstractType<any>} */ (item.parent) : /** @type {ContentType} */ (parentItem.content).type;\n\n  if (item.parentSub === null) {\n    // Is an array item. Insert at the old position\n    left = item.left;\n    right = item;\n    // find next cloned_redo items\n    while (left !== null) {\n      /**\n       * @type {Item|null}\n       */\n      let leftTrace = left;\n      // trace redone until parent matches\n      while (leftTrace !== null && /** @type {AbstractType<any>} */ (leftTrace.parent)._item !== parentItem) {\n        leftTrace = leftTrace.redone === null ? null : getItemCleanStart(transaction, leftTrace.redone);\n      }\n      if (leftTrace !== null && /** @type {AbstractType<any>} */ (leftTrace.parent)._item === parentItem) {\n        left = leftTrace;\n        break\n      }\n      left = left.left;\n    }\n    while (right !== null) {\n      /**\n       * @type {Item|null}\n       */\n      let rightTrace = right;\n      // trace redone until parent matches\n      while (rightTrace !== null && /** @type {AbstractType<any>} */ (rightTrace.parent)._item !== parentItem) {\n        rightTrace = rightTrace.redone === null ? null : getItemCleanStart(transaction, rightTrace.redone);\n      }\n      if (rightTrace !== null && /** @type {AbstractType<any>} */ (rightTrace.parent)._item === parentItem) {\n        right = rightTrace;\n        break\n      }\n      right = right.right;\n    }\n  } else {\n    right = null;\n    if (item.right && !ignoreRemoteMapChanges) {\n      left = item;\n      // Iterate right while right is in itemsToDelete\n      // If it is intended to delete right while item is redone, we can expect that item should replace right.\n      while (left !== null && left.right !== null && (left.right.redone || isDeleted(itemsToDelete, left.right.id) || isDeletedByUndoStack(um.undoStack, left.right.id) || isDeletedByUndoStack(um.redoStack, left.right.id))) {\n        left = left.right;\n        // follow redone\n        while (left.redone) left = getItemCleanStart(transaction, left.redone);\n      }\n      if (left && left.right !== null) {\n        // It is not possible to redo this item because it conflicts with a\n        // change from another client\n        return null\n      }\n    } else {\n      left = parentType._map.get(item.parentSub) || null;\n    }\n  }\n  const nextClock = getState(store, ownClientID);\n  const nextId = createID(ownClientID, nextClock);\n  const redoneItem = new Item(\n    nextId,\n    left, left && left.lastId,\n    right, right && right.id,\n    parentType,\n    item.parentSub,\n    item.content.copy()\n  );\n  item.redone = nextId;\n  keepItem(redoneItem, true);\n  redoneItem.integrate(transaction, 0);\n  return redoneItem\n};\n\n/**\n * Abstract class that represents any content.\n */\nclass Item extends AbstractStruct {\n  /**\n   * @param {ID} id\n   * @param {Item | null} left\n   * @param {ID | null} origin\n   * @param {Item | null} right\n   * @param {ID | null} rightOrigin\n   * @param {AbstractType<any>|ID|null} parent Is a type if integrated, is null if it is possible to copy parent from left or right, is ID before integration to search for it.\n   * @param {string | null} parentSub\n   * @param {AbstractContent} content\n   */\n  constructor (id, left, origin, right, rightOrigin, parent, parentSub, content) {\n    super(id, content.getLength());\n    /**\n     * The item that was originally to the left of this item.\n     * @type {ID | null}\n     */\n    this.origin = origin;\n    /**\n     * The item that is currently to the left of this item.\n     * @type {Item | null}\n     */\n    this.left = left;\n    /**\n     * The item that is currently to the right of this item.\n     * @type {Item | null}\n     */\n    this.right = right;\n    /**\n     * The item that was originally to the right of this item.\n     * @type {ID | null}\n     */\n    this.rightOrigin = rightOrigin;\n    /**\n     * @type {AbstractType<any>|ID|null}\n     */\n    this.parent = parent;\n    /**\n     * If the parent refers to this item with some kind of key (e.g. YMap, the\n     * key is specified here. The key is then used to refer to the list in which\n     * to insert this item. If `parentSub = null` type._start is the list in\n     * which to insert to. Otherwise it is `parent._map`.\n     * @type {String | null}\n     */\n    this.parentSub = parentSub;\n    /**\n     * If this type's effect is redone this type refers to the type that undid\n     * this operation.\n     * @type {ID | null}\n     */\n    this.redone = null;\n    /**\n     * @type {AbstractContent}\n     */\n    this.content = content;\n    /**\n     * bit1: keep\n     * bit2: countable\n     * bit3: deleted\n     * bit4: mark - mark node as fast-search-marker\n     * @type {number} byte\n     */\n    this.info = this.content.isCountable() ? binary.BIT2 : 0;\n  }\n\n  /**\n   * This is used to mark the item as an indexed fast-search marker\n   *\n   * @type {boolean}\n   */\n  set marker (isMarked) {\n    if (((this.info & binary.BIT4) > 0) !== isMarked) {\n      this.info ^= binary.BIT4;\n    }\n  }\n\n  get marker () {\n    return (this.info & binary.BIT4) > 0\n  }\n\n  /**\n   * If true, do not garbage collect this Item.\n   */\n  get keep () {\n    return (this.info & binary.BIT1) > 0\n  }\n\n  set keep (doKeep) {\n    if (this.keep !== doKeep) {\n      this.info ^= binary.BIT1;\n    }\n  }\n\n  get countable () {\n    return (this.info & binary.BIT2) > 0\n  }\n\n  /**\n   * Whether this item was deleted or not.\n   * @type {Boolean}\n   */\n  get deleted () {\n    return (this.info & binary.BIT3) > 0\n  }\n\n  set deleted (doDelete) {\n    if (this.deleted !== doDelete) {\n      this.info ^= binary.BIT3;\n    }\n  }\n\n  markDeleted () {\n    this.info |= binary.BIT3;\n  }\n\n  /**\n   * Return the creator clientID of the missing op or define missing items and return null.\n   *\n   * @param {Transaction} transaction\n   * @param {StructStore} store\n   * @return {null | number}\n   */\n  getMissing (transaction, store) {\n    if (this.origin && this.origin.client !== this.id.client && this.origin.clock >= getState(store, this.origin.client)) {\n      return this.origin.client\n    }\n    if (this.rightOrigin && this.rightOrigin.client !== this.id.client && this.rightOrigin.clock >= getState(store, this.rightOrigin.client)) {\n      return this.rightOrigin.client\n    }\n    if (this.parent && this.parent.constructor === ID && this.id.client !== this.parent.client && this.parent.clock >= getState(store, this.parent.client)) {\n      return this.parent.client\n    }\n\n    // We have all missing ids, now find the items\n\n    if (this.origin) {\n      this.left = getItemCleanEnd(transaction, store, this.origin);\n      this.origin = this.left.lastId;\n    }\n    if (this.rightOrigin) {\n      this.right = getItemCleanStart(transaction, this.rightOrigin);\n      this.rightOrigin = this.right.id;\n    }\n    if ((this.left && this.left.constructor === GC) || (this.right && this.right.constructor === GC)) {\n      this.parent = null;\n    } else if (!this.parent) {\n      // only set parent if this shouldn't be garbage collected\n      if (this.left && this.left.constructor === Item) {\n        this.parent = this.left.parent;\n        this.parentSub = this.left.parentSub;\n      }\n      if (this.right && this.right.constructor === Item) {\n        this.parent = this.right.parent;\n        this.parentSub = this.right.parentSub;\n      }\n    } else if (this.parent.constructor === ID) {\n      const parentItem = getItem(store, this.parent);\n      if (parentItem.constructor === GC) {\n        this.parent = null;\n      } else {\n        this.parent = /** @type {ContentType} */ (parentItem.content).type;\n      }\n    }\n    return null\n  }\n\n  /**\n   * @param {Transaction} transaction\n   * @param {number} offset\n   */\n  integrate (transaction, offset) {\n    if (offset > 0) {\n      this.id.clock += offset;\n      this.left = getItemCleanEnd(transaction, transaction.doc.store, createID(this.id.client, this.id.clock - 1));\n      this.origin = this.left.lastId;\n      this.content = this.content.splice(offset);\n      this.length -= offset;\n    }\n\n    if (this.parent) {\n      if ((!this.left && (!this.right || this.right.left !== null)) || (this.left && this.left.right !== this.right)) {\n        /**\n         * @type {Item|null}\n         */\n        let left = this.left;\n\n        /**\n         * @type {Item|null}\n         */\n        let o;\n        // set o to the first conflicting item\n        if (left !== null) {\n          o = left.right;\n        } else if (this.parentSub !== null) {\n          o = /** @type {AbstractType<any>} */ (this.parent)._map.get(this.parentSub) || null;\n          while (o !== null && o.left !== null) {\n            o = o.left;\n          }\n        } else {\n          o = /** @type {AbstractType<any>} */ (this.parent)._start;\n        }\n        // TODO: use something like DeleteSet here (a tree implementation would be best)\n        // @todo use global set definitions\n        /**\n         * @type {Set<Item>}\n         */\n        const conflictingItems = new Set();\n        /**\n         * @type {Set<Item>}\n         */\n        const itemsBeforeOrigin = new Set();\n        // Let c in conflictingItems, b in itemsBeforeOrigin\n        // ***{origin}bbbb{this}{c,b}{c,b}{o}***\n        // Note that conflictingItems is a subset of itemsBeforeOrigin\n        while (o !== null && o !== this.right) {\n          itemsBeforeOrigin.add(o);\n          conflictingItems.add(o);\n          if (compareIDs(this.origin, o.origin)) {\n            // case 1\n            if (o.id.client < this.id.client) {\n              left = o;\n              conflictingItems.clear();\n            } else if (compareIDs(this.rightOrigin, o.rightOrigin)) {\n              // this and o are conflicting and point to the same integration points. The id decides which item comes first.\n              // Since this is to the left of o, we can break here\n              break\n            } // else, o might be integrated before an item that this conflicts with. If so, we will find it in the next iterations\n          } else if (o.origin !== null && itemsBeforeOrigin.has(getItem(transaction.doc.store, o.origin))) { // use getItem instead of getItemCleanEnd because we don't want / need to split items.\n            // case 2\n            if (!conflictingItems.has(getItem(transaction.doc.store, o.origin))) {\n              left = o;\n              conflictingItems.clear();\n            }\n          } else {\n            break\n          }\n          o = o.right;\n        }\n        this.left = left;\n      }\n      // reconnect left/right + update parent map/start if necessary\n      if (this.left !== null) {\n        const right = this.left.right;\n        this.right = right;\n        this.left.right = this;\n      } else {\n        let r;\n        if (this.parentSub !== null) {\n          r = /** @type {AbstractType<any>} */ (this.parent)._map.get(this.parentSub) || null;\n          while (r !== null && r.left !== null) {\n            r = r.left;\n          }\n        } else {\n          r = /** @type {AbstractType<any>} */ (this.parent)._start\n          ;/** @type {AbstractType<any>} */ (this.parent)._start = this;\n        }\n        this.right = r;\n      }\n      if (this.right !== null) {\n        this.right.left = this;\n      } else if (this.parentSub !== null) {\n        // set as current parent value if right === null and this is parentSub\n        /** @type {AbstractType<any>} */ (this.parent)._map.set(this.parentSub, this);\n        if (this.left !== null) {\n          // this is the current attribute value of parent. delete right\n          this.left.delete(transaction);\n        }\n      }\n      // adjust length of parent\n      if (this.parentSub === null && this.countable && !this.deleted) {\n        /** @type {AbstractType<any>} */ (this.parent)._length += this.length;\n      }\n      addStruct(transaction.doc.store, this);\n      this.content.integrate(transaction, this);\n      // add parent to transaction.changed\n      addChangedTypeToTransaction(transaction, /** @type {AbstractType<any>} */ (this.parent), this.parentSub);\n      if ((/** @type {AbstractType<any>} */ (this.parent)._item !== null && /** @type {AbstractType<any>} */ (this.parent)._item.deleted) || (this.parentSub !== null && this.right !== null)) {\n        // delete if parent is deleted or if this is not the current attribute value of parent\n        this.delete(transaction);\n      }\n    } else {\n      // parent is not defined. Integrate GC struct instead\n      new GC(this.id, this.length).integrate(transaction, 0);\n    }\n  }\n\n  /**\n   * Returns the next non-deleted item\n   */\n  get next () {\n    let n = this.right;\n    while (n !== null && n.deleted) {\n      n = n.right;\n    }\n    return n\n  }\n\n  /**\n   * Returns the previous non-deleted item\n   */\n  get prev () {\n    let n = this.left;\n    while (n !== null && n.deleted) {\n      n = n.left;\n    }\n    return n\n  }\n\n  /**\n   * Computes the last content address of this Item.\n   */\n  get lastId () {\n    // allocating ids is pretty costly because of the amount of ids created, so we try to reuse whenever possible\n    return this.length === 1 ? this.id : createID(this.id.client, this.id.clock + this.length - 1)\n  }\n\n  /**\n   * Try to merge two items\n   *\n   * @param {Item} right\n   * @return {boolean}\n   */\n  mergeWith (right) {\n    if (\n      this.constructor === right.constructor &&\n      compareIDs(right.origin, this.lastId) &&\n      this.right === right &&\n      compareIDs(this.rightOrigin, right.rightOrigin) &&\n      this.id.client === right.id.client &&\n      this.id.clock + this.length === right.id.clock &&\n      this.deleted === right.deleted &&\n      this.redone === null &&\n      right.redone === null &&\n      this.content.constructor === right.content.constructor &&\n      this.content.mergeWith(right.content)\n    ) {\n      const searchMarker = /** @type {AbstractType<any>} */ (this.parent)._searchMarker;\n      if (searchMarker) {\n        searchMarker.forEach(marker => {\n          if (marker.p === right) {\n            // right is going to be \"forgotten\" so we need to update the marker\n            marker.p = this;\n            // adjust marker index\n            if (!this.deleted && this.countable) {\n              marker.index -= this.length;\n            }\n          }\n        });\n      }\n      if (right.keep) {\n        this.keep = true;\n      }\n      this.right = right.right;\n      if (this.right !== null) {\n        this.right.left = this;\n      }\n      this.length += right.length;\n      return true\n    }\n    return false\n  }\n\n  /**\n   * Mark this Item as deleted.\n   *\n   * @param {Transaction} transaction\n   */\n  delete (transaction) {\n    if (!this.deleted) {\n      const parent = /** @type {AbstractType<any>} */ (this.parent);\n      // adjust the length of parent\n      if (this.countable && this.parentSub === null) {\n        parent._length -= this.length;\n      }\n      this.markDeleted();\n      addToDeleteSet(transaction.deleteSet, this.id.client, this.id.clock, this.length);\n      addChangedTypeToTransaction(transaction, parent, this.parentSub);\n      this.content.delete(transaction);\n    }\n  }\n\n  /**\n   * @param {StructStore} store\n   * @param {boolean} parentGCd\n   */\n  gc (store, parentGCd) {\n    if (!this.deleted) {\n      throw error.unexpectedCase()\n    }\n    this.content.gc(store);\n    if (parentGCd) {\n      replaceStruct(store, this, new GC(this.id, this.length));\n    } else {\n      this.content = new ContentDeleted(this.length);\n    }\n  }\n\n  /**\n   * Transform the properties of this type to binary and write it to an\n   * BinaryEncoder.\n   *\n   * This is called when this Item is sent to a remote peer.\n   *\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder The encoder to write data to.\n   * @param {number} offset\n   */\n  write (encoder, offset) {\n    const origin = offset > 0 ? createID(this.id.client, this.id.clock + offset - 1) : this.origin;\n    const rightOrigin = this.rightOrigin;\n    const parentSub = this.parentSub;\n    const info = (this.content.getRef() & binary.BITS5) |\n      (origin === null ? 0 : binary.BIT8) | // origin is defined\n      (rightOrigin === null ? 0 : binary.BIT7) | // right origin is defined\n      (parentSub === null ? 0 : binary.BIT6); // parentSub is non-null\n    encoder.writeInfo(info);\n    if (origin !== null) {\n      encoder.writeLeftID(origin);\n    }\n    if (rightOrigin !== null) {\n      encoder.writeRightID(rightOrigin);\n    }\n    if (origin === null && rightOrigin === null) {\n      const parent = /** @type {AbstractType<any>} */ (this.parent);\n      if (parent._item !== undefined) {\n        const parentItem = parent._item;\n        if (parentItem === null) {\n          // parent type on y._map\n          // find the correct key\n          const ykey = findRootTypeKey(parent);\n          encoder.writeParentInfo(true); // write parentYKey\n          encoder.writeString(ykey);\n        } else {\n          encoder.writeParentInfo(false); // write parent id\n          encoder.writeLeftID(parentItem.id);\n        }\n      } else if (parent.constructor === String) { // this edge case was added by differential updates\n        encoder.writeParentInfo(true); // write parentYKey\n        encoder.writeString(parent);\n      } else if (parent.constructor === ID) {\n        encoder.writeParentInfo(false); // write parent id\n        encoder.writeLeftID(parent);\n      } else {\n        error.unexpectedCase();\n      }\n      if (parentSub !== null) {\n        encoder.writeString(parentSub);\n      }\n    }\n    this.content.write(encoder, offset);\n  }\n}\n\n/**\n * @param {UpdateDecoderV1 | UpdateDecoderV2} decoder\n * @param {number} info\n */\nconst readItemContent = (decoder, info) => contentRefs[info & binary.BITS5](decoder);\n\n/**\n * A lookup map for reading Item content.\n *\n * @type {Array<function(UpdateDecoderV1 | UpdateDecoderV2):AbstractContent>}\n */\nconst contentRefs = [\n  () => { error.unexpectedCase(); }, // GC is not ItemContent\n  readContentDeleted, // 1\n  readContentJSON, // 2\n  readContentBinary, // 3\n  readContentString, // 4\n  readContentEmbed, // 5\n  readContentFormat, // 6\n  readContentType, // 7\n  readContentAny, // 8\n  readContentDoc, // 9\n  () => { error.unexpectedCase(); } // 10 - Skip is not ItemContent\n];\n\nconst structSkipRefNumber = 10;\n\n/**\n * @private\n */\nclass Skip extends AbstractStruct {\n  get deleted () {\n    return true\n  }\n\n  delete () {}\n\n  /**\n   * @param {Skip} right\n   * @return {boolean}\n   */\n  mergeWith (right) {\n    if (this.constructor !== right.constructor) {\n      return false\n    }\n    this.length += right.length;\n    return true\n  }\n\n  /**\n   * @param {Transaction} transaction\n   * @param {number} offset\n   */\n  integrate (transaction, offset) {\n    // skip structs cannot be integrated\n    error.unexpectedCase();\n  }\n\n  /**\n   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder\n   * @param {number} offset\n   */\n  write (encoder, offset) {\n    encoder.writeInfo(structSkipRefNumber);\n    // write as VarUint because Skips can't make use of predictable length-encoding\n    encoding.writeVarUint(encoder.restEncoder, this.length - offset);\n  }\n\n  /**\n   * @param {Transaction} transaction\n   * @param {StructStore} store\n   * @return {null | number}\n   */\n  getMissing (transaction, store) {\n    return null\n  }\n}\n\n/** eslint-env browser */\n\n\nconst glo = /** @type {any} */ (typeof globalThis !== 'undefined'\n  ? globalThis\n  : typeof window !== 'undefined'\n    ? window\n    // @ts-ignore\n    : typeof global !== 'undefined' ? global : {});\n\nconst importIdentifier = '__ $YJS$ __';\n\nif (glo[importIdentifier] === true) {\n  /**\n   * Dear reader of this message. Please take this seriously.\n   *\n   * If you see this message, make sure that you only import one version of Yjs. In many cases,\n   * your package manager installs two versions of Yjs that are used by different packages within your project.\n   * Another reason for this message is that some parts of your project use the commonjs version of Yjs\n   * and others use the EcmaScript version of Yjs.\n   *\n   * This often leads to issues that are hard to debug. We often need to perform constructor checks,\n   * e.g. `struct instanceof GC`. If you imported different versions of Yjs, it is impossible for us to\n   * do the constructor checks anymore - which might break the CRDT algorithm.\n   *\n   * https://github.com/yjs/yjs/issues/438\n   */\n  console.error('Yjs was already imported. 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createRelativePositionFromJSON, createRelativePositionFromTypeIndex, createSnapshot, decodeRelativePosition, decodeSnapshot, decodeSnapshotV2, decodeStateVector, decodeUpdate, decodeUpdateV2, diffUpdate, diffUpdateV2, emptySnapshot, encodeRelativePosition, encodeSnapshot, encodeSnapshotV2, encodeStateAsUpdate, encodeStateAsUpdateV2, encodeStateVector, encodeStateVectorFromUpdate, encodeStateVectorFromUpdateV2, equalDeleteSets, equalSnapshots, findIndexSS, findRootTypeKey, getItem, getState, getTypeChildren, isDeleted, isParentOf, iterateDeletedStructs, logType, logUpdate, logUpdateV2, mergeDeleteSets, mergeUpdates, mergeUpdatesV2, obfuscateUpdate, obfuscateUpdateV2, parseUpdateMeta, parseUpdateMetaV2, readUpdate, readUpdateV2, relativePositionToJSON, snapshot, snapshotContainsUpdate, transact, tryGc, typeListToArraySnapshot, typeMapGetAllSnapshot, typeMapGetSnapshot };\n//# 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