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49 lines
1.6 KiB
TypeScript
49 lines
1.6 KiB
TypeScript
// Copyright 2018 Ryan Dahl <ry@tinyclouds.org>
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// All rights reserved. MIT License.
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import { debug } from "./main";
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import { TypedArray } from "./types";
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// Internal logging for deno. Use the "debug" variable above to control
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// output.
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// tslint:disable-next-line:no-any
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export function log(...args: any[]): void {
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if (debug) {
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console.log(...args);
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}
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}
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export function assert(cond: boolean, msg = "") {
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if (!cond) {
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throw Error("Assert fail. " + msg);
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}
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}
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export function typedArrayToArrayBuffer(ta: TypedArray): ArrayBuffer {
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const ab = ta.buffer.slice(ta.byteOffset, ta.byteOffset + ta.byteLength);
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return ab as ArrayBuffer;
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}
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// A `Resolvable` is a Promise with the `reject` and `resolve` functions
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// placed as methods on the promise object itself. It allows you to do:
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//
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// const p = createResolvable<number>();
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// ...
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// p.resolve(42);
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//
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// It'd be prettier to make Resolvable a class that inherits from Promise,
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// rather than an interface. This is possible in ES2016, however typescript
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// produces broken code when targeting ES5 code.
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// See https://github.com/Microsoft/TypeScript/issues/15202
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// At the time of writing, the github issue is closed but the problem remains.
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export interface Resolvable<T> extends Promise<T> {
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resolve: (value?: T | PromiseLike<T>) => void;
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// tslint:disable-next-line:no-any
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reject: (reason?: any) => void;
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}
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export function createResolvable<T>(): Resolvable<T> {
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let methods;
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const promise = new Promise<T>((resolve, reject) => {
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methods = { resolve, reject };
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});
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return Object.assign(promise, methods) as Resolvable<T>;
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}
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