36 lines
1.2 KiB
JavaScript
Executable File
36 lines
1.2 KiB
JavaScript
Executable File
import { root } from '../util/root';
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export function symbolIteratorPonyfill(root) {
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const Symbol = root.Symbol;
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if (typeof Symbol === 'function') {
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if (!Symbol.iterator) {
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Symbol.iterator = Symbol('iterator polyfill');
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}
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return Symbol.iterator;
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}
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else {
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// [for Mozilla Gecko 27-35:](https://mzl.la/2ewE1zC)
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const { Set } = root;
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if (Set && typeof new Set()['@@iterator'] === 'function') {
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return '@@iterator';
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}
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const { Map } = root;
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// required for compatability with es6-shim
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if (Map) {
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let keys = Object.getOwnPropertyNames(Map.prototype);
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for (let i = 0; i < keys.length; ++i) {
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let key = keys[i];
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// according to spec, Map.prototype[@@iterator] and Map.orototype.entries must be equal.
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if (key !== 'entries' && key !== 'size' && Map.prototype[key] === Map.prototype['entries']) {
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return key;
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}
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}
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}
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return '@@iterator';
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}
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}
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export const iterator = symbolIteratorPonyfill(root);
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/**
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* @deprecated use iterator instead
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*/
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export const $$iterator = iterator;
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//# sourceMappingURL=iterator.js.map
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