From f184332c09c851faac50f598d29ebe4426e05464 Mon Sep 17 00:00:00 2001 From: Nayeem Rahman Date: Sat, 9 May 2020 13:34:47 +0100 Subject: BREAKING(std): reorganization (#5087) * Prepend underscores to private modules * Remove collectUint8Arrays() It would be a misuse of Deno.iter()'s result. * Move std/_util/async.ts to std/async * Move std/util/sha*.ts to std/hash --- std/async/deferred.ts | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) create mode 100644 std/async/deferred.ts (limited to 'std/async/deferred.ts') diff --git a/std/async/deferred.ts b/std/async/deferred.ts new file mode 100644 index 000000000..109a1a37e --- /dev/null +++ b/std/async/deferred.ts @@ -0,0 +1,26 @@ +// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license. +// TODO(ry) It'd be better to make Deferred a class that inherits from +// Promise, rather than an interface. This is possible in ES2016, however +// typescript produces broken code when targeting ES5 code. +// See https://github.com/Microsoft/TypeScript/issues/15202 +// At the time of writing, the github issue is closed but the problem remains. +export interface Deferred extends Promise { + resolve: (value?: T | PromiseLike) => void; + // eslint-disable-next-line @typescript-eslint/no-explicit-any + reject: (reason?: any) => void; +} + +/** Creates a Promise with the `reject` and `resolve` functions + * placed as methods on the promise object itself. It allows you to do: + * + * const p = deferred(); + * // ... + * p.resolve(42); + */ +export function deferred(): Deferred { + let methods; + const promise = new Promise((resolve, reject): void => { + methods = { resolve, reject }; + }); + return Object.assign(promise, methods) as Deferred; +} -- cgit v1.2.3