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https://github.com/denoland/deno
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feat: enable Array.fromAsync (#21048)
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24c3c96958
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@ -368,7 +368,8 @@ pub fn main() {
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// Using same default as VSCode:
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// https://github.com/microsoft/vscode/blob/48d4ba271686e8072fc6674137415bc80d936bc7/extensions/typescript-language-features/src/configuration/configuration.ts#L213-L214
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DenoSubcommand::Lsp => vec!["--max-old-space-size=3072".to_string()],
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_ => vec![],
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// TODO(bartlomieju): upstream this to `deno_core` crate
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_ => vec!["--harmony-array-from-async".to_string()],
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};
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init_v8_flags(&default_v8_flags, &flags.v8_flags, get_v8_flags_from_env());
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deno_core::JsRuntime::init_platform(None);
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@ -500,6 +500,7 @@ Deno.test(function consoleTestStringifyFunctionWithProperties() {
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[isArray]: [Function: isArray] { [length]: 1, [name]: "isArray" },
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[from]: [Function: from] { [length]: 1, [name]: "from" },
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[of]: [Function: of] { [length]: 0, [name]: "of" },
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[fromAsync]: [Function: fromAsync] { [length]: 1, [name]: "fromAsync" },
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[Symbol(Symbol.species)]: [Getter]
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}`,
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);
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@ -153,3 +153,20 @@ Deno.test(async function promiseWithResolvers() {
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await assertRejects(() => promise, Error, "boom!");
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}
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});
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Deno.test(async function arrayFromAsync() {
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// Taken from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fromAsync#examples
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// Thank you.
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const asyncIterable = (async function* () {
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for (let i = 0; i < 5; i++) {
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await new Promise((resolve) => setTimeout(resolve, 10 * i));
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yield i;
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}
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})();
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const a = await Array.fromAsync(asyncIterable);
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assertEquals(a, [0, 1, 2, 3, 4]);
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const b = await Array.fromAsync(new Map([[1, 2], [3, 4]]));
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assertEquals(b, [[1, 2], [3, 4]]);
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});
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14
cli/tsc/dts/lib.esnext.array.d.ts
vendored
14
cli/tsc/dts/lib.esnext.array.d.ts
vendored
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@ -291,3 +291,17 @@ interface BigUint64Array {
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with(index: number, value: number): BigUint64Array;
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}
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// NOTE(bartlomieju): taken from https://github.com/microsoft/TypeScript/issues/50803#issuecomment-1249030430
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// while we wait for these types to officially ship
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interface ArrayConstructor {
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fromAsync<T>(
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iterableOrArrayLike: AsyncIterable<T> | Iterable<T | Promise<T>> | ArrayLike<T | Promise<T>>,
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): Promise<T[]>;
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fromAsync<T, U>(
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iterableOrArrayLike: AsyncIterable<T> | Iterable<T> | ArrayLike<T>,
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mapFn: (value: Awaited<T>) => U,
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thisArg?: any,
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): Promise<Awaited<U>[]>;
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}
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