Node.js EventEmitter emitter[Symbol.for('nodejs.rejection')](err, eventName[, ...args])用法及代码示例

emitter[Symbol.for('nodejs.rejection')](err, eventName[, ...args])

参数

• err 错误
• eventName <string> | <symbol>
• ...args <any>

Symbol.for('nodejs.rejection') 方法被调用以防在发射事件时发生承诺拒绝并且在发射器上启用了 captureRejections 。可以使用 events.captureRejectionSymbol 代替 Symbol.for('nodejs.rejection') 。

const { EventEmitter, captureRejectionSymbol } = require('node:events');

class MyClass extends EventEmitter {
  constructor() {
    super({ captureRejections: true });
  }

  [captureRejectionSymbol](err, event, ...args) {
    console.log('rejection happened for', event, 'with', err, ...args);
    this.destroy(err);
  }

  destroy(err) {
    // Tear the resource down here.
  }
}