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91 lines
2.4 KiB
TypeScript
91 lines
2.4 KiB
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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/* TODO https://github.com/denoland/deno/issues/7540
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import { unitTest, assert, assertEquals } from "./test_util.ts";
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// eslint-disable-next-line @typescript-eslint/explicit-function-return-type
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function setup() {
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const dataSymbol = Symbol("data symbol");
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class Base {
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[dataSymbol] = new Map<string, number>();
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constructor(
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data: Array<[string, number]> | IterableIterator<[string, number]>,
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) {
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for (const [key, value] of data) {
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this[dataSymbol].set(key, value);
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}
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}
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}
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return {
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Base,
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// This is using an internal API we don't want published as types, so having
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// to cast to any to "trick" TypeScript
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// @ts-expect-error TypeScript (as of 3.7) does not support indexing namespaces by symbol
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DomIterable: Deno[Deno.internal].DomIterableMixin(Base, dataSymbol),
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};
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}
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unitTest(function testDomIterable(): void {
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const { DomIterable, Base } = setup();
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const fixture: Array<[string, number]> = [
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["foo", 1],
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["bar", 2],
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];
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const domIterable = new DomIterable(fixture);
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assertEquals(Array.from(domIterable.entries()), fixture);
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assertEquals(Array.from(domIterable.values()), [1, 2]);
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assertEquals(Array.from(domIterable.keys()), ["foo", "bar"]);
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let result: Array<[string, number]> = [];
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for (const [key, value] of domIterable) {
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assert(key != null);
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assert(value != null);
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result.push([key, value]);
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}
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assertEquals(fixture, result);
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result = [];
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const scope = {};
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function callback(
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this: typeof scope,
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value: number,
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key: string,
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parent: typeof domIterable,
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): void {
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assertEquals(parent, domIterable);
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assert(key != null);
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assert(value != null);
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assert(this === scope);
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result.push([key, value]);
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}
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domIterable.forEach(callback, scope);
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assertEquals(fixture, result);
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assertEquals(DomIterable.name, Base.name);
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});
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unitTest(function testDomIterableScope(): void {
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const { DomIterable } = setup();
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const domIterable = new DomIterable([["foo", 1]]);
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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function checkScope(thisArg: any, expected: any): void {
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function callback(this: typeof thisArg): void {
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assertEquals(this, expected);
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}
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domIterable.forEach(callback, thisArg);
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}
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checkScope(0, Object(0));
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checkScope("", Object(""));
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checkScope(null, window);
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checkScope(undefined, window);
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});
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*/
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