简单的实现

对于许多简单的情况，可以在不依赖继承的情况下创建流。 这可以通过直接创建 stream.Writable、stream.Readable、stream.Duplex 或 stream.Transform 对象的实例并将适当的方法作为构造函数选项传递来实现。

const { Writable } = require('node:stream');

const myWritable = new Writable({
  construct(callback) {
    // 初始化状态并加载资源...
  },
  write(chunk, encoding, callback) {
    // ...
  },
  destroy() {
    // 释放资源...
  }
});

For many simple cases, it is possible to create a stream without relying on inheritance. This can be accomplished by directly creating instances of the stream.Writable, stream.Readable, stream.Duplex, or stream.Transform objects and passing appropriate methods as constructor options.

const { Writable } = require('node:stream');

const myWritable = new Writable({
  construct(callback) {
    // Initialize state and load resources...
  },
  write(chunk, encoding, callback) {
    // ...
  },
  destroy() {
    // Free resources...
  }
});