22 lines
643 B
TypeScript
22 lines
643 B
TypeScript
import stream from 'stream'; // 默认导入整个模块
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const { EventEmitter, once } = stream; // 从中解构出 EventEmitter
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// 事件
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export const emitter = new EventEmitter();
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type EmitterType = typeof emitter;
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// 异步触发事件 demo
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export const asyncEmit = (emitter: EmitterType, eventName: string) => {
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return new Promise((resolve) => {
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emitter.once(eventName, (value: any) => resolve(value));
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});
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};
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async function main() {
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setTimeout(() => {
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emitter.emit('asyncEvent', '监听器中的值');
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}, 1000);
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asyncEmit(emitter, 'asyncEvent').then((result) => {
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console.log(result); // 监听器中的值
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});
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}
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