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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 | 144x 144x 144x 144x 144x 144x 144x 144x 144x 144x 144x 144x 144x 144x 144x 150x 150x 150x 150x 150x 150x 232x 232x 1x 1x 1x 232x 231x 231x 231x 231x 231x 231x 231x 231x 232x 150x 150x 1x 1x 150x 150x 1x 1x 150x 150x 2x 2x 1x 1x 1x 1x 1x 1x 2x 150x 150x 66x 66x 66x 127x 127x 61x 127x 60x 60x 66x 66x 66x 66x 66x 66x 66x 150x 144x 1x 1x 1x 144x 144x 144x 144x 144x 144x | 'use strict'; const { ObjectFreeze, SafeFinalizationRegistry, SafeSet, SafeWeakMap, SafeWeakRef, SymbolIterator, } = primordials; // This class is modified from the example code in the WeakRefs specification: // https://github.com/tc39/proposal-weakrefs // Licensed under ECMA's MIT-style license, see: // https://github.com/tc39/ecma262/blob/HEAD/LICENSE.md class IterableWeakMap { #weakMap = new SafeWeakMap(); #refSet = new SafeSet(); #finalizationGroup = new SafeFinalizationRegistry(cleanup); set(key, value) { const entry = this.#weakMap.get(key); if (entry) { // If there's already an entry for the object represented by "key", // the value can be updated without creating a new WeakRef: this.#weakMap.set(key, { value, ref: entry.ref }); } else { const ref = new SafeWeakRef(key); this.#weakMap.set(key, { value, ref }); this.#refSet.add(ref); this.#finalizationGroup.register(key, { set: this.#refSet, ref }, ref); } } get(key) { return this.#weakMap.get(key)?.value; } has(key) { return this.#weakMap.has(key); } delete(key) { const entry = this.#weakMap.get(key); if (!entry) { return false; } this.#weakMap.delete(key); this.#refSet.delete(entry.ref); this.#finalizationGroup.unregister(entry.ref); return true; } [SymbolIterator]() { const iterator = this.#refSet[SymbolIterator](); const next = () => { const result = iterator.next(); if (result.done) return result; const key = result.value.deref(); if (key == null) return next(); const { value } = this.#weakMap.get(key); return { done: false, value }; }; return { [SymbolIterator]() { return this; }, next, }; } } function cleanup({ set, ref }) { set.delete(ref); } ObjectFreeze(IterableWeakMap.prototype); module.exports = { IterableWeakMap, }; |