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@tldraw/store

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tldraw infinite canvas SDK (store).

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{ "version": 3, "sources": ["../../src/lib/ImmutableMap.ts"], "sourcesContent": ["/*!\n * This file was lovingly and delicately extracted from Immutable.js\n * MIT License: https://github.com/immutable-js/immutable-js/blob/main/LICENSE\n * Copyright (c) 2014-present, Lee Byron and other contributors.\n */\n\nfunction smi(i32: number) {\n\treturn ((i32 >>> 1) & 0x40000000) | (i32 & 0xbfffffff)\n}\n\nconst defaultValueOf = Object.prototype.valueOf\n\nfunction hash(o: any) {\n\tif (o == null) {\n\t\treturn hashNullish(o)\n\t}\n\n\tif (typeof o.hashCode === 'function') {\n\t\t// Drop any high bits from accidentally long hash codes.\n\t\treturn smi(o.hashCode(o))\n\t}\n\n\tconst v = valueOf(o)\n\n\tif (v == null) {\n\t\treturn hashNullish(v)\n\t}\n\n\tswitch (typeof v) {\n\t\tcase 'boolean':\n\t\t\t// The hash values for built-in constants are a 1 value for each 5-byte\n\t\t\t// shift region expect for the first, which encodes the value. This\n\t\t\t// reduces the odds of a hash collision for these common values.\n\t\t\treturn v ? 0x42108421 : 0x42108420\n\t\tcase 'number':\n\t\t\treturn hashNumber(v)\n\t\tcase 'string':\n\t\t\treturn v.length > STRING_HASH_CACHE_MIN_STRLEN ? cachedHashString(v) : hashString(v)\n\t\tcase 'object':\n\t\tcase 'function':\n\t\t\treturn hashJSObj(v)\n\t\tcase 'symbol':\n\t\t\treturn hashSymbol(v)\n\t\tdefault:\n\t\t\tif (typeof v.toString === 'function') {\n\t\t\t\treturn hashString(v.toString())\n\t\t\t}\n\t\t\tthrow new Error('Value type ' + typeof v + ' cannot be hashed.')\n\t}\n}\n\nfunction hashNullish(nullish: null | undefined) {\n\treturn nullish === null ? 0x42108422 : /* undefined */ 0x42108423\n}\n\n// Compress arbitrarily large numbers into smi hashes.\nfunction hashNumber(n: number) {\n\tif (n !== n || n === Infinity) {\n\t\treturn 0\n\t}\n\tlet hash = n | 0\n\tif (hash !== n) {\n\t\thash ^= n * 0xffffffff\n\t}\n\twhile (n > 0xffffffff) {\n\t\tn /= 0xffffffff\n\t\thash ^= n\n\t}\n\treturn smi(hash)\n}\n\nfunction cachedHashString(string: string) {\n\tlet hashed = stringHashCache[string]\n\tif (hashed === undefined) {\n\t\thashed = hashString(string)\n\t\tif (STRING_HASH_CACHE_SIZE === STRING_HASH_CACHE_MAX_SIZE) {\n\t\t\tSTRING_HASH_CACHE_SIZE = 0\n\t\t\tstringHashCache = {}\n\t\t}\n\t\tSTRING_HASH_CACHE_SIZE++\n\t\tstringHashCache[string] = hashed\n\t}\n\treturn hashed\n}\n\n// http://jsperf.com/hashing-strings\nfunction hashString(string: string) {\n\t// This is the hash from JVM\n\t// The hash code for a string is computed as\n\t// s[0] * 31 ^ (n - 1) + s[1] * 31 ^ (n - 2) + ... + s[n - 1],\n\t// where s[i] is the ith character of the string and n is the length of\n\t// the string. We \"mod\" the result to make it between 0 (inclusive) and 2^31\n\t// (exclusive) by dropping high bits.\n\tlet hashed = 0\n\tfor (let ii = 0; ii < string.length; ii++) {\n\t\thashed = (31 * hashed + string.charCodeAt(ii)) | 0\n\t}\n\treturn smi(hashed)\n}\n\nfunction hashSymbol(sym: symbol) {\n\tlet hashed = symbolMap[sym]\n\tif (hashed !== undefined) {\n\t\treturn hashed\n\t}\n\n\thashed = nextHash()\n\n\tsymbolMap[sym] = hashed\n\n\treturn hashed\n}\n\nfunction hashJSObj(obj: object) {\n\tlet hashed = weakMap.get(obj)\n\tif (hashed !== undefined) {\n\t\treturn hashed\n\t}\n\n\thashed = nextHash()\n\n\tweakMap.set(obj, hashed)\n\n\treturn hashed\n}\n\nfunction valueOf(obj: any) {\n\treturn obj.valueOf !== defaultValueOf && typeof obj.valueOf === 'function'\n\t\t? obj.valueOf(obj)\n\t\t: obj\n}\n\nfunction nextHash() {\n\tconst nextHash = ++_objHashUID\n\tif (_objHashUID & 0x40000000) {\n\t\t_objHashUID = 0\n\t}\n\treturn nextHash\n}\n\n// If possible, use a WeakMap.\nconst weakMap = new WeakMap()\n\nconst symbolMap = Object.create(null)\n\nlet _objHashUID = 0\n\nconst STRING_HASH_CACHE_MIN_STRLEN = 16\nconst STRING_HASH_CACHE_MAX_SIZE = 255\nlet STRING_HASH_CACHE_SIZE = 0\nlet stringHashCache: Record<string, number> = {}\n\n// Constants describing the size of trie nodes.\nconst SHIFT = 5 // Resulted in best performance after ______?\nconst SIZE = 1 << SHIFT\nconst MASK = SIZE - 1\n\n// A consistent shared value representing \"not set\" which equals nothing other\n// than itself, and nothing that could be provided externally.\nconst NOT_SET = {}\n\ninterface Ref {\n\tvalue: boolean\n}\n\n// Boolean references, Rough equivalent of `bool &`.\nfunction MakeRef(): Ref {\n\treturn { value: false }\n}\n\nfunction SetRef(ref?: Ref): void {\n\tif (ref) {\n\t\tref.value = true\n\t}\n}\n\n// http://jsperf.com/copy-array-inline\nfunction arrCopy<I>(arr: Array<I>, offset?: number): Array<I> {\n\toffset = offset || 0\n\tconst len = Math.max(0, arr.length - offset)\n\tconst newArr: Array<I> = new Array(len)\n\tfor (let ii = 0; ii < len; ii++) {\n\t\t// We may want to guard for undefined values with `if (arr[ii + offset] !== undefined`, but ths should not happen by design\n\t\tnewArr[ii] = arr[ii + offset]\n\t}\n\treturn newArr\n}\n\nconst is = Object.is\n\nclass OwnerID {}\n\nexport class ImmutableMap<K, V> {\n\t// @pragma Construction\n\t// @ts-ignore\n\t_root: MapNode<K, V>\n\t// @ts-ignore\n\tsize: number\n\t// @ts-ignore\n\t__ownerID: OwnerID\n\t// @ts-ignore\n\t__hash: number | undefined\n\t// @ts-ignore\n\t__altered: boolean\n\n\tconstructor(value?: Iterable<[K, V]> | null | undefined) {\n\t\t// @ts-ignore\n\t\treturn value === undefined || value === null\n\t\t\t? emptyMap()\n\t\t\t: value instanceof ImmutableMap\n\t\t\t\t? value\n\t\t\t\t: emptyMap().withMutations((map) => {\n\t\t\t\t\t\tfor (const [k, v] of value) {\n\t\t\t\t\t\t\tmap.set(k, v)\n\t\t\t\t\t\t}\n\t\t\t\t\t})\n\t}\n\n\tget(k: K): V | undefined\n\tget(k: K, notSetValue?: V): V {\n\t\treturn this._root ? this._root.get(0, undefined as any, k, notSetValue)! : notSetValue!\n\t}\n\n\tset(k: K, v: V) {\n\t\treturn updateMap(this, k, v)\n\t}\n\n\tdelete(k: K) {\n\t\treturn updateMap(this, k, NOT_SET as any)\n\t}\n\n\tdeleteAll(keys: Iterable<K>) {\n\t\treturn this.withMutations((map) => {\n\t\t\tfor (const key of keys) {\n\t\t\t\tmap.delete(key)\n\t\t\t}\n\t\t})\n\t}\n\n\t__ensureOwner(ownerID: OwnerID) {\n\t\tif (ownerID === this.__ownerID) {\n\t\t\treturn this\n\t\t}\n\t\tif (!ownerID) {\n\t\t\tif (this.size === 0) {\n\t\t\t\treturn emptyMap()\n\t\t\t}\n\t\t\tthis.__ownerID = ownerID\n\t\t\tthis.__altered = false\n\t\t\treturn this\n\t\t}\n\t\treturn makeMap(this.size, this._root, ownerID, this.__hash)\n\t}\n\n\twithMutations(fn: (mutable: this) => void): this {\n\t\tconst mutable = this.asMutable()\n\t\tfn(mutable)\n\t\treturn mutable.wasAltered() ? mutable.__ensureOwner(this.__ownerID) : this\n\t}\n\n\twasAltered() {\n\t\treturn this.__altered\n\t}\n\n\tasMutable() {\n\t\treturn this.__ownerID ? this : this.__ensureOwner(new OwnerID())\n\t}\n\n\t[Symbol.iterator](): Iterator<[K, V]> {\n\t\treturn this.entries()[Symbol.iterator]()\n\t}\n\n\tentries(): Iterable<[K, V]> {\n\t\treturn new MapIterator(this, ITERATE_ENTRIES, false)\n\t}\n\n\tkeys(): Iterable<K> {\n\t\treturn new MapIterator(this, ITERATE_KEYS, false)\n\t}\n\n\tvalues(): Iterable<V> {\n\t\treturn new MapIterator(this, ITERATE_VALUES, false)\n\t}\n}\n\ntype MapNode<K, V> =\n\t| ArrayMapNode<K, V>\n\t| BitmapIndexedNode<K, V>\n\t| HashArrayMapNode<K, V>\n\t| HashCollisionNode<K, V>\n\t| ValueNode<K, V>\n\n// #pragma Trie Nodes\n\nclass ArrayMapNode<K, V> {\n\tconstructor(\n\t\tpublic ownerID: OwnerID,\n\t\tpublic entries: Array<[K, V]>\n\t) {}\n\n\tget(_shift: unknown, _keyHash: unknown, key: K, notSetValue?: V) {\n\t\tconst entries = this.entries\n\t\tfor (let ii = 0, len = entries.length; ii < len; ii++) {\n\t\t\tif (is(key, entries[ii][0])) {\n\t\t\t\treturn entries[ii][1]\n\t\t\t}\n\t\t}\n\t\treturn notSetValue\n\t}\n\n\tupdate(\n\t\townerID: OwnerID,\n\t\t_shift: unknown,\n\t\t_keyHash: unknown,\n\t\tkey: K,\n\t\tvalue: V,\n\t\tdidChangeSize?: Ref,\n\t\tdidAlter?: Ref\n\t): MapNode<K, V> | undefined {\n\t\tconst removed = value === NOT_SET\n\n\t\tconst entries = this.entries\n\t\tlet idx = 0\n\t\tconst len = entries.length\n\t\tfor (; idx < len; idx++) {\n\t\t\tif (is(key, entries[idx][0])) {\n\t\t\t\tbreak\n\t\t\t}\n\t\t}\n\t\tconst exists = idx < len\n\n\t\tif (exists ? entries[idx][1] === value : removed) {\n\t\t\treturn this\n\t\t}\n\n\t\tSetRef(didAlter)\n\t\t// eslint-disable-next-line @typescript-eslint/no-unused-expressions -- TODO enable eslint here\n\t\t;(removed || !exists) && SetRef(didChangeSize)\n\n\t\tif (removed && entries.length === 1) {\n\t\t\treturn // undefined\n\t\t}\n\n\t\tif (!exists && !removed && entries.length >= MAX_ARRAY_MAP_SIZE) {\n\t\t\treturn createNodes(ownerID, entries, key, value)\n\t\t}\n\n\t\tconst isEditable = ownerID && ownerID === this.ownerID\n\t\tconst newEntries = isEditable ? entries : arrCopy(entries)\n\n\t\tif (exists) {\n\t\t\tif (removed) {\n\t\t\t\t// eslint-disable-next-line @typescript-eslint/no-unused-expressions -- TODO enable eslint here\n\t\t\t\tidx === len - 1 ? newEntries.pop() : (newEntries[idx] = newEntries.pop()!)\n\t\t\t} else {\n\t\t\t\tnewEntries[idx] = [key, value]\n\t\t\t}\n\t\t} else {\n\t\t\tnewEntries.push([key, value])\n\t\t}\n\n\t\tif (isEditable) {\n\t\t\tthis.entries = newEntries\n\t\t\treturn this\n\t\t}\n\n\t\treturn new ArrayMapNode(ownerID, newEntries)\n\t}\n}\n\nclass BitmapIndexedNode<K, V> {\n\tconstructor(\n\t\tpublic ownerID: OwnerID,\n\t\tpublic bitmap: number,\n\t\tpublic nodes: Array<MapNode<K, V>>\n\t) {}\n\n\tget(shift: number, keyHash: number, key: K, notSetValue?: V): V | undefined {\n\t\tif (keyHash === undefined) {\n\t\t\tkeyHash = hash(key)\n\t\t}\n\t\tconst bit = 1 << ((shift === 0 ? keyHash : keyHash >>> shift) & MASK)\n\t\tconst bitmap = this.bitmap\n\t\treturn (bitmap & bit) === 0\n\t\t\t? notSetValue\n\t\t\t: this.nodes[popCount(bitmap & (bit - 1))].get(shift + SHIFT, keyHash, key, notSetValue)\n\t}\n\n\tupdate(\n\t\townerID: OwnerID,\n\t\tshift: number,\n\t\tkeyHash: number,\n\t\tkey: K,\n\t\tvalue: V,\n\t\tdidChangeSize?: Ref,\n\t\tdidAlter?: Ref\n\t): MapNode<K, V> | undefined {\n\t\tif (keyHash === undefined) {\n\t\t\tkeyHash = hash(key)\n\t\t}\n\t\tconst keyHashFrag = (shift === 0 ? keyHash : keyHash >>> shift) & MASK\n\t\tconst bit = 1 << keyHashFrag\n\t\tconst bitmap = this.bitmap\n\t\tconst exists = (bitmap & bit) !== 0\n\n\t\tif (!exists && value === NOT_SET) {\n\t\t\treturn this\n\t\t}\n\n\t\tconst idx = popCount(bitmap & (bit - 1))\n\t\tconst nodes = this.nodes\n\t\tconst node = exists ? nodes[idx] : undefined\n\t\tconst newNode = updateNode(\n\t\t\tnode,\n\t\t\townerID,\n\t\t\tshift + SHIFT,\n\t\t\tkeyHash,\n\t\t\tkey,\n\t\t\tvalue,\n\t\t\tdidChangeSize,\n\t\t\tdidAlter\n\t\t)\n\n\t\tif (newNode === node) {\n\t\t\treturn this\n\t\t}\n\n\t\tif (!exists && newNode && nodes.length >= MAX_BITMAP_INDEXED_SIZE) {\n\t\t\treturn expandNodes(ownerID, nodes, bitmap, keyHashFrag, newNode)\n\t\t}\n\n\t\tif (exists && !newNode && nodes.length === 2 && isLeafNode(nodes[idx ^ 1])) {\n\t\t\treturn nodes[idx ^ 1]\n\t\t}\n\n\t\tif (exists && newNode && nodes.length === 1 && isLeafNode(newNode)) {\n\t\t\treturn newNode\n\t\t}\n\n\t\tconst isEditable = ownerID && ownerID === this.ownerID\n\t\tconst newBitmap = exists ? (newNode ? bitmap : bitmap ^ bit) : bitmap | bit\n\t\tconst newNodes = exists\n\t\t\t? newNode\n\t\t\t\t? setAt(nodes, idx, newNode, isEditable)\n\t\t\t\t: spliceOut(nodes, idx, isEditable)\n\t\t\t: spliceIn(nodes, idx, newNode, isEditable)\n\n\t\tif (isEditable) {\n\t\t\tthis.bitmap = newBitmap\n\t\t\tthis.nodes = newNodes\n\t\t\treturn this\n\t\t}\n\n\t\treturn new BitmapIndexedNode(ownerID, newBitmap, newNodes)\n\t}\n}\n\nclass HashArrayMapNode<K, V> {\n\tconstructor(\n\t\tpublic ownerID: OwnerID,\n\t\tpublic count: number,\n\t\tpublic nodes: Array<MapNode<K, V>>\n\t) {}\n\n\tget(shift: number, keyHash: number, key: K, notSetValue?: V): V | undefined {\n\t\tif (keyHash === undefined) {\n\t\t\tkeyHash = hash(key)\n\t\t}\n\t\tconst idx = (shift === 0 ? keyHash : keyHash >>> shift) & MASK\n\t\tconst node = this.nodes[idx]\n\t\treturn node ? node.get(shift + SHIFT, keyHash, key, notSetValue) : notSetValue\n\t}\n\n\tupdate(\n\t\townerID: OwnerID,\n\t\tshift: number,\n\t\tkeyHash: number,\n\t\tkey: K,\n\t\tvalue: V,\n\t\tdidChangeSize?: Ref,\n\t\tdidAlter?: Ref\n\t) {\n\t\tif (keyHash === undefined) {\n\t\t\tkeyHash = hash(key)\n\t\t}\n\t\tconst idx = (shift === 0 ? keyHash : keyHash >>> shift) & MASK\n\t\tconst removed = value === NOT_SET\n\t\tconst nodes = this.nodes\n\t\tconst node = nodes[idx]\n\n\t\tif (removed && !node) {\n\t\t\treturn this\n\t\t}\n\n\t\tconst newNode = updateNode(\n\t\t\tnode,\n\t\t\townerID,\n\t\t\tshift + SHIFT,\n\t\t\tkeyHash,\n\t\t\tkey,\n\t\t\tvalue,\n\t\t\tdidChangeSize,\n\t\t\tdidAlter\n\t\t)\n\t\tif (newNode === node) {\n\t\t\treturn this\n\t\t}\n\n\t\tlet newCount = this.count\n\t\tif (!node) {\n\t\t\tnewCount++\n\t\t} else if (!newNode) {\n\t\t\tnewCount--\n\t\t\tif (newCount < MIN_HASH_ARRAY_MAP_SIZE) {\n\t\t\t\treturn packNodes(ownerID, nodes, newCount, idx)\n\t\t\t}\n\t\t}\n\n\t\tconst isEditable = ownerID && ownerID === this.ownerID\n\t\tconst newNodes = setAt(nodes, idx, newNode!, isEditable)\n\n\t\tif (isEditable) {\n\t\t\tthis.count = newCount\n\t\t\tthis.nodes = newNodes\n\t\t\treturn this\n\t\t}\n\n\t\treturn new HashArrayMapNode(ownerID, newCount, newNodes)\n\t}\n}\n\nclass HashCollisionNode<K, V> {\n\tconstructor(\n\t\tpublic ownerID: OwnerID,\n\t\tpublic keyHash: number,\n\t\tpublic entries: Array<[K, V]>\n\t) {}\n\n\tget(shift: number, keyHash: number, key: K, notSetValue?: V) {\n\t\tconst entries = this.entries\n\t\tfor (let ii = 0, len = entries.length; ii < len; ii++) {\n\t\t\tif (is(key, entries[ii][0])) {\n\t\t\t\treturn entries[ii][1]\n\t\t\t}\n\t\t}\n\t\treturn notSetValue\n\t}\n\n\tupdate(\n\t\townerID: OwnerID,\n\t\tshift: number,\n\t\tkeyHash: number,\n\t\tkey: K,\n\t\tvalue: V,\n\t\tdidChangeSize?: Ref,\n\t\tdidAlter?: Ref\n\t): MapNode<K, V> {\n\t\tif (keyHash === undefined) {\n\t\t\tkeyHash = hash(key)\n\t\t}\n\n\t\tconst removed = value === NOT_SET\n\n\t\tif (keyHash !== this.keyHash) {\n\t\t\tif (removed) {\n\t\t\t\treturn this\n\t\t\t}\n\t\t\tSetRef(didAlter)\n\t\t\tSetRef(didChangeSize)\n\t\t\treturn mergeIntoNode(this, ownerID, shift, keyHash, [key, value])\n\t\t}\n\n\t\tconst entries = this.entries\n\t\tlet idx = 0\n\t\tconst len = entries.length\n\t\tfor (; idx < len; idx++) {\n\t\t\tif (is(key, entries[idx][0])) {\n\t\t\t\tbreak\n\t\t\t}\n\t\t}\n\t\tconst exists = idx < len\n\n\t\tif (exists ? entries[idx][1] === value : removed) {\n\t\t\treturn this\n\t\t}\n\n\t\tSetRef(didAlter)\n\t\t// eslint-disable-next-line @typescript-eslint/no-unused-expressions -- TODO enable eslint here\n\t\t;(removed || !exists) && SetRef(didChangeSize)\n\n\t\tif (removed && len === 2) {\n\t\t\treturn new ValueNode(ownerID, this.keyHash, entries[idx ^ 1])\n\t\t}\n\n\t\tconst isEditable = ownerID && ownerID === this.ownerID\n\t\tconst newEntries = isEditable ? entries : arrCopy(entries)\n\n\t\tif (exists) {\n\t\t\tif (removed) {\n\t\t\t\t// eslint-disable-next-line @typescript-eslint/no-unused-expressions -- TODO enable eslint here\n\t\t\t\tidx === len - 1 ? newEntries.pop() : (newEntries[idx] = newEntries.pop()!)\n\t\t\t} else {\n\t\t\t\tnewEntries[idx] = [key, value]\n\t\t\t}\n\t\t} else {\n\t\t\tnewEntries.push([key, value])\n\t\t}\n\n\t\tif (isEditable) {\n\t\t\tthis.entries = newEntries\n\t\t\treturn this\n\t\t}\n\n\t\treturn new HashCollisionNode(ownerID, this.keyHash, newEntries)\n\t}\n}\n\nclass ValueNode<K, V> {\n\tconstructor(\n\t\tpublic ownerID: OwnerID,\n\t\tpublic keyHash: number | undefined,\n\t\tpublic entry: [K, V]\n\t) {}\n\n\tget(shift: number, keyHash: number, key: K, notSetValue?: V) {\n\t\treturn is(key, this.entry[0]) ? this.entry[1] : notSetValue\n\t}\n\n\tupdate(\n\t\townerID: OwnerID,\n\t\tshift: number,\n\t\tkeyHash: number | undefined,\n\t\tkey: K,\n\t\tvalue: V,\n\t\tdidChangeSize?: Ref,\n\t\tdidAlter?: Ref\n\t) {\n\t\tconst removed = value === NOT_SET\n\t\tconst keyMatch = is(key, this.entry[0])\n\t\tif (keyMatch ? value === this.entry[1] : removed) {\n\t\t\treturn this\n\t\t}\n\n\t\tSetRef(didAlter)\n\n\t\tif (removed) {\n\t\t\tSetRef(didChangeSize)\n\t\t\treturn // undefined\n\t\t}\n\n\t\tif (keyMatch) {\n\t\t\tif (ownerID && ownerID === this.ownerID) {\n\t\t\t\tthis.entry[1] = value\n\t\t\t\treturn this\n\t\t\t}\n\t\t\treturn new ValueNode(ownerID, this.keyHash, [key, value])\n\t\t}\n\n\t\tSetRef(didChangeSize)\n\t\treturn mergeIntoNode(this, ownerID, shift, hash(key), [key, value])\n\t}\n}\n\n// #pragma Iterators\n\nclass MapIterator<K, V> implements Iterator<any>, Iterable<any> {\n\t_stack\n\n\tconstructor(\n\t\tmap: ImmutableMap<K, V>,\n\t\tpublic _type: IterationType,\n\t\tpublic _reverse: boolean\n\t) {\n\t\tthis._stack = map._root && mapIteratorFrame<K, V>(map._root)\n\t}\n\n\t[Symbol.iterator](): Iterator<any> {\n\t\treturn this\n\t}\n\n\tnext() {\n\t\tconst type = this._type\n\t\tlet stack = this._stack\n\t\twhile (stack) {\n\t\t\tconst node = stack.node as any\n\t\t\tconst index = stack.index++\n\t\t\tlet maxIndex\n\t\t\tif (node.entry) {\n\t\t\t\tif (index === 0) {\n\t\t\t\t\treturn mapIteratorValue(type, node.entry)\n\t\t\t\t}\n\t\t\t} else if ('entries' in node && node.entries) {\n\t\t\t\tmaxIndex = node.entries.length - 1\n\t\t\t\tif (index <= maxIndex) {\n\t\t\t\t\treturn mapIteratorValue(type, node.entries[this._reverse ? maxIndex - index : index])\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tmaxIndex = node.nodes.length - 1\n\t\t\t\tif (index <= maxIndex) {\n\t\t\t\t\tconst subNode = node.nodes[this._reverse ? maxIndex - index : index]\n\t\t\t\t\tif (subNode) {\n\t\t\t\t\t\tif (subNode.entry) {\n\t\t\t\t\t\t\treturn mapIteratorValue(type, subNode.entry)\n\t\t\t\t\t\t}\n\t\t\t\t\t\tstack = this._stack = mapIteratorFrame(subNode, stack)\n\t\t\t\t\t}\n\t\t\t\t\tcontinue\n\t\t\t\t}\n\t\t\t}\n\t\t\tstack = this._stack = this._stack.__prev!\n\t\t}\n\t\treturn iteratorDone() as any\n\t}\n}\n\nfunction mapIteratorValue<K, V>(type: IterationType, entry: [K, V]) {\n\treturn iteratorValue(type, entry[0], entry[1])\n}\n\ninterface IStack {\n\tnode: MapNode<unknown, unknown>\n\tindex: number\n\t__prev?: IStack\n}\n\nfunction mapIteratorFrame<K, V>(\n\tnode: MapNode<K, V>,\n\tprev?: { node: MapNode<K, V>; index: number; __prev?: IStack }\n): IStack {\n\treturn {\n\t\tnode: node,\n\t\tindex: 0,\n\t\t__prev: prev,\n\t}\n}\n\nconst ITERATE_KEYS = 0\nconst ITERATE_VALUES = 1\nconst ITERATE_ENTRIES = 2\n\ntype IterationType = typeof ITERATE_KEYS | typeof ITERATE_VALUES | typeof ITERATE_ENTRIES\n\nfunction iteratorValue<K, V>(\n\ttype: IterationType,\n\tk: K,\n\tv: V,\n\titeratorResult?: IteratorResult<any>\n) {\n\tconst value = type === ITERATE_KEYS ? 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