68 lines
2.7 KiB
JavaScript
68 lines
2.7 KiB
JavaScript
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import { _ as _define_property } from "@swc/helpers/_/_define_property";
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const internalSetSymbol = Symbol('#internalSet');
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let _internalSetSymbol = internalSetSymbol, _Symbol_hasInstance = Symbol.hasInstance, _Symbol_iterator = Symbol.iterator;
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/**
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* @public
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*
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* Small immutable wrapper around the native Set implementation.
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* Every operation that would modify the set returns a new copy instance.
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*/ export class ImmutableSet {
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static dangerouslyGetInternalSet(set) {
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return set[internalSetSymbol];
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}
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static copy(immutableSet) {
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return new ImmutableSet(new Set(immutableSet[internalSetSymbol]));
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}
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/**
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* Creates a new {@link ImmutableSet} from an iterable.
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* If the iterable is undefined, {@link ImmutableSet.empty} will be returned.
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* If the iterable is already an {@link ImmutableSet}, it will be returned as is no copy will be made.
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*/ static from(iterable) {
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if (iterable === undefined) {
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return this.empty;
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}
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if (iterable instanceof this) {
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return iterable;
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}
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return new this(new Set(iterable));
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}
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static [_Symbol_hasInstance](instance) {
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return Boolean(typeof instance === 'object' && instance && internalSetSymbol in instance);
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}
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add(value) {
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if (this.has(value)) {
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return this;
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}
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const copy = ImmutableSet.copy(this);
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copy[internalSetSymbol].add(value);
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return copy;
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}
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delete(value) {
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if (!this.has(value)) {
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return this;
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}
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const copy = ImmutableSet.copy(this);
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copy[internalSetSymbol].delete(value);
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return copy;
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}
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has(value) {
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return this[internalSetSymbol].has(value);
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}
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[_Symbol_iterator]() {
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return this[internalSetSymbol].values();
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}
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/**
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* Do not use this constructor directly, use {@link ImmutableSet.from} instead.
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* {@link ImmutableSet.from} handles instance verification (which might be problematic on {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/instanceof#instanceof_and_multiple_realms | multiple realms}),
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* avoid unnecessary copies, supports iterables and ensures that the internal set is never exposed.
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*
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*⚠️⚠️ _By using this constructor directly, you might end up with a mutable set, as it is not guaranteed that the internal set is not exposed._ ⚠️⚠️
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*/ constructor(internalSet){
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_define_property(this, "size", void 0);
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_define_property(this, _internalSetSymbol, void 0);
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this[internalSetSymbol] = internalSet;
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this.size = this[internalSetSymbol].size;
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}
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}
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_define_property(ImmutableSet, "empty", new ImmutableSet(new Set()));
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