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

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

Symbol.for('nodejs.rejection') 方法在以下情况下被调用：当在触发事件时发生 Promise 拒绝，并且触发器上启用了 captureRejections。可以使用 events.captureRejectionSymbol 来替代 Symbol.for('nodejs.rejection')。

【The Symbol.for('nodejs.rejection') method is called in case a promise rejection happens when emitting an event and captureRejections is enabled on the emitter. It is possible to use events.captureRejectionSymbol in place of Symbol.for('nodejs.rejection').】

import { EventEmitter, captureRejectionSymbol } from '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.
  }
}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.
  }
}拷贝