mirror of https://github.com/denoland/deno.git
86 lines
2.8 KiB
TypeScript
86 lines
2.8 KiB
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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// eslint-disable-next-line @typescript-eslint/no-unused-vars
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import { DomIterable } from "../dom_types.ts";
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import { requiredArguments } from "../util.ts";
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import { exposeForTest } from "../internals.ts";
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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type Constructor<T = {}> = new (...args: any[]) => T;
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/** Mixes in a DOM iterable methods into a base class, assumes that there is
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* a private data iterable that is part of the base class, located at
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* `[dataSymbol]`.
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*/
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export function DomIterableMixin<K, V, TBase extends Constructor>(
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Base: TBase,
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dataSymbol: symbol
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): TBase & Constructor<DomIterable<K, V>> {
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// we have to cast `this` as `any` because there is no way to describe the
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// Base class in a way where the Symbol `dataSymbol` is defined. So the
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// runtime code works, but we do lose a little bit of type safety.
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// Additionally, we have to not use .keys() nor .values() since the internal
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// slot differs in type - some have a Map, which yields [K, V] in
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// Symbol.iterator, and some have an Array, which yields V, in this case
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// [K, V] too as they are arrays of tuples.
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const DomIterable = class extends Base {
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*entries(): IterableIterator<[K, V]> {
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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for (const entry of (this as any)[dataSymbol]) {
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yield entry;
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}
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}
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*keys(): IterableIterator<K> {
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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for (const [key] of (this as any)[dataSymbol]) {
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yield key;
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}
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}
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*values(): IterableIterator<V> {
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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for (const [, value] of (this as any)[dataSymbol]) {
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yield value;
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}
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}
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forEach(
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callbackfn: (value: V, key: K, parent: this) => void,
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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thisArg?: any
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): void {
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requiredArguments(
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`${this.constructor.name}.forEach`,
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arguments.length,
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1
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);
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callbackfn = callbackfn.bind(
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thisArg == null ? globalThis : Object(thisArg)
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);
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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for (const [key, value] of (this as any)[dataSymbol]) {
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callbackfn(value, key, this);
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}
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}
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*[Symbol.iterator](): IterableIterator<[K, V]> {
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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for (const entry of (this as any)[dataSymbol]) {
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yield entry;
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}
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}
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};
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// we want the Base class name to be the name of the class.
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Object.defineProperty(DomIterable, "name", {
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value: Base.name,
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configurable: true
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});
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return DomIterable;
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}
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exposeForTest("DomIterableMixin", DomIterableMixin);
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