1 | /**
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2 | * @license
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3 | * Copyright Google LLC All Rights Reserved.
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4 | *
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5 | * Use of this source code is governed by an MIT-style license that can be
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6 | * found in the LICENSE file at https://angular.io/license
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7 | */
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8 | import { EventEmitter } from '../event_emitter';
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9 | import { arrayEquals, flatten } from '../util/array_utils';
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10 | import { getSymbolIterator } from '../util/symbol';
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11 | function symbolIterator() {
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12 | return this._results[getSymbolIterator()]();
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13 | }
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14 | /**
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15 | * An unmodifiable list of items that Angular keeps up to date when the state
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16 | * of the application changes.
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17 | *
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18 | * The type of object that {@link ViewChildren}, {@link ContentChildren}, and {@link QueryList}
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19 | * provide.
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20 | *
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21 | * Implements an iterable interface, therefore it can be used in both ES6
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22 | * javascript `for (var i of items)` loops as well as in Angular templates with
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23 | * `*ngFor="let i of myList"`.
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24 | *
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25 | * Changes can be observed by subscribing to the changes `Observable`.
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26 | *
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27 | * NOTE: In the future this class will implement an `Observable` interface.
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28 | *
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29 | * @usageNotes
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30 | * ### Example
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31 | * ```typescript
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32 | * @Component({...})
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33 | * class Container {
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34 | * @ViewChildren(Item) items:QueryList<Item>;
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35 | * }
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36 | * ```
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37 | *
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38 | * @publicApi
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39 | */
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40 | export class QueryList {
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41 | /**
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42 | * @param emitDistinctChangesOnly Whether `QueryList.changes` should fire only when actual change
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43 | * has occurred. Or if it should fire when query is recomputed. (recomputing could resolve in
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44 | * the same result)
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45 | */
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46 | constructor(_emitDistinctChangesOnly = false) {
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47 | this._emitDistinctChangesOnly = _emitDistinctChangesOnly;
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48 | this.dirty = true;
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49 | this._results = [];
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50 | this._changesDetected = false;
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51 | this._changes = null;
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52 | this.length = 0;
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53 | this.first = undefined;
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54 | this.last = undefined;
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55 | // This function should be declared on the prototype, but doing so there will cause the class
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56 | // declaration to have side-effects and become not tree-shakable. For this reason we do it in
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57 | // the constructor.
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58 | // [getSymbolIterator()](): Iterator<T> { ... }
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59 | const symbol = getSymbolIterator();
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60 | const proto = QueryList.prototype;
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61 | if (!proto[symbol])
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62 | proto[symbol] = symbolIterator;
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63 | }
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64 | /**
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65 | * Returns `Observable` of `QueryList` notifying the subscriber of changes.
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66 | */
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67 | get changes() {
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68 | return this._changes || (this._changes = new EventEmitter());
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69 | }
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70 | /**
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71 | * Returns the QueryList entry at `index`.
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72 | */
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73 | get(index) {
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74 | return this._results[index];
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75 | }
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76 | /**
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77 | * See
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78 | * [Array.map](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map)
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79 | */
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80 | map(fn) {
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81 | return this._results.map(fn);
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82 | }
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83 | /**
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84 | * See
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85 | * [Array.filter](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter)
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86 | */
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87 | filter(fn) {
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88 | return this._results.filter(fn);
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89 | }
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90 | /**
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91 | * See
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92 | * [Array.find](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find)
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93 | */
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94 | find(fn) {
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95 | return this._results.find(fn);
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96 | }
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97 | /**
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98 | * See
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99 | * [Array.reduce](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce)
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100 | */
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101 | reduce(fn, init) {
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102 | return this._results.reduce(fn, init);
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103 | }
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104 | /**
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105 | * See
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106 | * [Array.forEach](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach)
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107 | */
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108 | forEach(fn) {
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109 | this._results.forEach(fn);
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110 | }
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111 | /**
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112 | * See
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113 | * [Array.some](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some)
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114 | */
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115 | some(fn) {
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116 | return this._results.some(fn);
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117 | }
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118 | /**
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119 | * Returns a copy of the internal results list as an Array.
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120 | */
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121 | toArray() {
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122 | return this._results.slice();
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123 | }
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124 | toString() {
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125 | return this._results.toString();
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126 | }
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127 | /**
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128 | * Updates the stored data of the query list, and resets the `dirty` flag to `false`, so that
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129 | * on change detection, it will not notify of changes to the queries, unless a new change
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130 | * occurs.
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131 | *
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132 | * @param resultsTree The query results to store
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133 | * @param identityAccessor Optional function for extracting stable object identity from a value
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134 | * in the array. This function is executed for each element of the query result list while
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135 | * comparing current query list with the new one (provided as a first argument of the `reset`
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136 | * function) to detect if the lists are different. If the function is not provided, elements
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137 | * are compared as is (without any pre-processing).
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138 | */
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139 | reset(resultsTree, identityAccessor) {
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140 | // Cast to `QueryListInternal` so that we can mutate fields which are readonly for the usage of
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141 | // QueryList (but not for QueryList itself.)
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142 | const self = this;
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143 | self.dirty = false;
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144 | const newResultFlat = flatten(resultsTree);
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145 | if (this._changesDetected = !arrayEquals(self._results, newResultFlat, identityAccessor)) {
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146 | self._results = newResultFlat;
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147 | self.length = newResultFlat.length;
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148 | self.last = newResultFlat[this.length - 1];
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149 | self.first = newResultFlat[0];
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150 | }
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151 | }
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152 | /**
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153 | * Triggers a change event by emitting on the `changes` {@link EventEmitter}.
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154 | */
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155 | notifyOnChanges() {
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156 | if (this._changes && (this._changesDetected || !this._emitDistinctChangesOnly))
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157 | this._changes.emit(this);
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158 | }
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159 | /** internal */
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160 | setDirty() {
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161 | this.dirty = true;
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162 | }
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163 | /** internal */
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164 | destroy() {
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165 | this.changes.complete();
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166 | this.changes.unsubscribe();
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167 | }
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168 | }
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169 | Symbol.iterator;
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Or if it should fire when query is recomputed. (recomputing could resolve in\n   *     the same result)\n   */\n  constructor(private _emitDistinctChangesOnly: boolean = false) {\n    // This function should be declared on the prototype, but doing so there will cause the class\n    // declaration to have side-effects and become not tree-shakable. For this reason we do it in\n    // the constructor.\n    // [getSymbolIterator()](): Iterator<T> { ... }\n    const symbol = getSymbolIterator();\n    const proto = QueryList.prototype as any;\n    if (!proto[symbol]) proto[symbol] = symbolIterator;\n  }\n\n  /**\n   * Returns the QueryList entry at `index`.\n   */\n  get(index: number): T|undefined {\n    return this._results[index];\n  }\n\n  /**\n   * See\n   * [Array.map](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map)\n   */\n  map<U>(fn: (item: T, index: number, array: T[]) => U): U[] {\n    return this._results.map(fn);\n  }\n\n  /**\n   * See\n   * [Array.filter](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter)\n   */\n  filter(fn: (item: T, index: number, array: T[]) => boolean): T[] {\n    return this._results.filter(fn);\n  }\n\n  /**\n   * See\n   * [Array.find](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find)\n   */\n  find(fn: (item: T, index: number, array: T[]) => boolean): T|undefined {\n    return this._results.find(fn);\n  }\n\n  /**\n   * See\n   * [Array.reduce](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce)\n   */\n  reduce<U>(fn: (prevValue: U, curValue: T, curIndex: number, array: T[]) => U, init: U): U {\n    return this._results.reduce(fn, init);\n  }\n\n  /**\n   * See\n   * [Array.forEach](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach)\n   */\n  forEach(fn: (item: T, index: number, array: T[]) => void): void {\n    this._results.forEach(fn);\n  }\n\n  /**\n   * See\n   * [Array.some](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some)\n   */\n  some(fn: (value: T, index: number, array: T[]) => boolean): boolean {\n    return this._results.some(fn);\n  }\n\n  /**\n   * Returns a copy of the internal results list as an Array.\n   */\n  toArray(): T[] {\n    return this._results.slice();\n  }\n\n  toString(): string {\n    return this._results.toString();\n  }\n\n  /**\n   * Updates the stored data of the query list, and resets the `dirty` flag to `false`, so that\n   * on change detection, it will not notify of changes to the queries, unless a new change\n   * occurs.\n   *\n   * @param resultsTree The query results to store\n   * @param identityAccessor Optional function for extracting stable object identity from a value\n   *    in the array. This function is executed for each element of the query result list while\n   *    comparing current query list with the new one (provided as a first argument of the `reset`\n   *    function) to detect if the lists are different. If the function is not provided, elements\n   *    are compared as is (without any pre-processing).\n   */\n  reset(resultsTree: Array<T|any[]>, identityAccessor?: (value: T) => unknown): void {\n    // Cast to `QueryListInternal` so that we can mutate fields which are readonly for the usage of\n    // QueryList (but not for QueryList itself.)\n    const self = this as QueryListInternal<T>;\n    (self as {dirty: boolean}).dirty = false;\n    const newResultFlat = flatten(resultsTree);\n    if (this._changesDetected = !arrayEquals(self._results, newResultFlat, identityAccessor)) {\n      self._results = newResultFlat;\n      self.length = newResultFlat.length;\n      self.last = newResultFlat[this.length - 1];\n      self.first = newResultFlat[0];\n    }\n  }\n\n  /**\n   * Triggers a change event by emitting on the `changes` {@link EventEmitter}.\n   */\n  notifyOnChanges(): void {\n    if (this._changes && (this._changesDetected || !this._emitDistinctChangesOnly))\n      this._changes.emit(this);\n  }\n\n  /** internal */\n  setDirty() {\n    (this as {dirty: boolean}).dirty = true;\n  }\n\n  /** internal */\n  destroy(): void {\n    (this.changes as EventEmitter<any>).complete();\n    (this.changes as EventEmitter<any>).unsubscribe();\n  }\n\n  // The implementation of `Symbol.iterator` should be declared here, but this would cause\n  // tree-shaking issues with `QueryList. So instead, it's added in the constructor (see comments\n  // there) and this declaration is left here to ensure that TypeScript considers QueryList to\n  // implement the Iterable interface. This is required for template type-checking of NgFor loops\n  // over QueryLists to work correctly, since QueryList must be assignable to NgIterable.\n  [Symbol.iterator]!: () => Iterator<T>;\n}\n\n/**\n * Internal set of APIs used by the framework. (not to be made public)\n */\ninterface QueryListInternal<T> extends QueryList<T> {\n  reset(a: any[]): void;\n  notifyOnChanges(): void;\n  length: number;\n  last: T;\n  first: T;\n}\n"]} |
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