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85 lines
2.2 KiB
TypeScript
85 lines
2.2 KiB
TypeScript
// Copyright 2018 the Deno authors. All rights reserved. MIT license.
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import { TypedArray } from "./types";
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let logDebug = false;
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// @internal
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export function setLogDebug(debug: boolean): void {
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logDebug = debug;
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}
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/**
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* Debug logging for deno. Enable with the `--DEBUG` command line flag.
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* @internal
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*/
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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 (logDebug) {
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console.log("DEBUG JS -", ...args);
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}
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}
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// @internal
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export function assert(cond: boolean, msg = "assert") {
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if (!cond) {
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throw Error(msg);
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}
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}
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// @internal
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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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// @internal
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export function arrayToStr(ui8: Uint8Array): string {
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return String.fromCharCode(...ui8);
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}
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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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*
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* @internal
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*/
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export interface ResolvableMethods<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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// @internal
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export type Resolvable<T> = Promise<T> & ResolvableMethods<T>;
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// @internal
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export function createResolvable<T>(): Resolvable<T> {
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let methods: ResolvableMethods<T>;
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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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// TypeScript doesn't know that the Promise callback occurs synchronously
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// therefore use of not null assertion (`!`)
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return Object.assign(promise, methods!) as Resolvable<T>;
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}
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// @internal
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export function notImplemented(): never {
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throw new Error("Not implemented");
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}
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// @internal
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export function unreachable(): never {
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throw new Error("Code not reachable");
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}
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