Remove utils from library
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@ -1067,7 +1067,7 @@ test.cb(
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},
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);
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test("last() yields the last chunk streamed by the given readable stream", async t => {
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test("last() resolves to the last chunk streamed by the given readable stream", async t => {
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const source = new Readable({ objectMode: true });
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const lastPromise = last(source);
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source.push("ab");
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@ -1,7 +1,5 @@
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import { Transform, Readable, Writable, Duplex } from "stream";
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import * as _utils from "./utils";
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import { ChildProcess } from "child_process";
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export const utils = _utils;
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export interface ThroughOptions {
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objectMode?: boolean;
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@ -1,39 +0,0 @@
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import test from "ava";
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import { expect } from "chai";
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import { EventEmitter } from "events";
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import { once, sleep, delay } from "./utils";
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const TimingErrorMarginMs = 50;
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test("sleep() resolves after the specified delay in milliseconds", async t => {
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const before = Date.now();
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await sleep(200);
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const after = Date.now();
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expect(after - before).gte(200);
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expect(after - before).closeTo(200, TimingErrorMarginMs);
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});
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test("delay() resolves a value after the specified delay in milliseconds", async t => {
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const before = Date.now();
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const value = await delay("abc", 200);
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const after = Date.now();
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expect(value).equal("abc");
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expect(after - before).gte(200);
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expect(after - before).closeTo(200, TimingErrorMarginMs);
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});
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test("once() resolves only after the specified event is emitted", async t => {
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const emitter = new EventEmitter();
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const before = Date.now();
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emitter.emit("noise", "is ignored");
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setTimeout(() => emitter.emit("done", "some-result"), 200);
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const result = await once(emitter, "done");
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const after = Date.now();
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expect(result).equal("some-result");
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expect(after - before).gte(200);
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expect(after - before).closeTo(200, TimingErrorMarginMs);
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});
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39
src/utils.ts
39
src/utils.ts
@ -1,39 +0,0 @@
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/**
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* Resolve after the given delay in milliseconds
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*
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* @param ms The number of milliseconds to wait
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*/
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export function sleep(ms: number) {
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return new Promise(resolve => {
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setTimeout(resolve, ms);
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});
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}
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/**
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* Resolve a value after the given delay in milliseconds
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*
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* @param value Value to resolve
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* @param ms Number of milliseconds to wait
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*/
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export function delay<T>(value: T, ms: number): Promise<T> {
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return new Promise(resolve => {
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setTimeout(() => resolve(value), ms);
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});
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}
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/**
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* Resolve once the given event emitter emits the specified event
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*
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* @param emitter Event emitter to watch
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* @param event Event to watch
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*/
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export function once<T>(
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emitter: NodeJS.EventEmitter,
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event: string,
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): Promise<T> {
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return new Promise(resolve => {
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emitter.once(event, result => {
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resolve(result);
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});
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});
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}
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