90 lines
2.7 KiB
TypeScript
90 lines
2.7 KiB
TypeScript
// Copyright (c) 2013-2020 GitHub Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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/**
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* @fileoverview A set of helper functions to make it easier to work
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* with events in async/await manner.
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*/
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/**
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* @param {!EventTarget} target
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* @param {string} eventName
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* @return {!Promise<!Event>}
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*/
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export const waitForEvent = (target: EventTarget, eventName: string) => {
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return new Promise((resolve) => {
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target.addEventListener(eventName, resolve, { once: true })
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})
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}
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/**
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* @param {!EventEmitter} emitter
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* @param {string} eventName
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* @return {!Promise<!Array>} With Event as the first item.
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*/
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export const emittedOnce = (
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emitter: NodeJS.EventEmitter,
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eventName: string,
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trigger?: () => void,
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) => {
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return emittedNTimes(emitter, eventName, 1, trigger).then(([result]) => result)
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}
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export const emittedNTimes = async (
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emitter: NodeJS.EventEmitter,
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eventName: string,
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times: number,
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trigger?: () => void,
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) => {
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const events: any[][] = []
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const p = new Promise<any[][]>((resolve) => {
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const handler = (...args: any[]) => {
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events.push(args)
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if (events.length === times) {
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emitter.removeListener(eventName, handler)
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resolve(events)
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}
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}
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emitter.on(eventName, handler)
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})
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if (trigger) {
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await Promise.resolve(trigger())
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}
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return p
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}
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export const emittedUntil = async (
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emitter: NodeJS.EventEmitter,
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eventName: string,
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untilFn: Function,
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) => {
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const p = new Promise<any[]>((resolve) => {
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const handler = (...args: any[]) => {
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if (untilFn(...args)) {
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emitter.removeListener(eventName, handler)
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resolve(args)
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}
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}
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emitter.on(eventName, handler)
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})
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return p
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}
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