与模块定制钩子通信

【Communication with module customization hooks】

模块自定义钩子在专用线程上运行，独立于运行应用代码的主线程。这意味着修改全局变量不会影响其他线程，必须使用消息通道在各线程之间进行通信。

【Module customization hooks run on a dedicated thread, separate from the main thread that runs application code. This means mutating global variables won't affect the other thread(s), and message channels must be used to communicate between the threads.】

register 方法可以用来向 initialize 钩子传递数据。传递给钩子的数据可能包括可转移的对象，例如端口。

【The register method can be used to pass data to an initialize hook. The data passed to the hook may include transferrable objects like ports.】

import { register } from 'node:module';
import { MessageChannel } from 'node:worker_threads';

// This example demonstrates how a message channel can be used to
// communicate with the hooks, by sending `port2` to the hooks.
const { port1, port2 } = new MessageChannel();

port1.on('message', (msg) => {
  console.log(msg);
});
port1.unref();

register('./my-hooks.mjs', {
  parentURL: import.meta.url,
  data: { number: 1, port: port2 },
  transferList: [port2],
});const { register } = require('node:module');
const { pathToFileURL } = require('node:url');
const { MessageChannel } = require('node:worker_threads');

// This example showcases how a message channel can be used to
// communicate with the hooks, by sending `port2` to the hooks.
const { port1, port2 } = new MessageChannel();

port1.on('message', (msg) => {
  console.log(msg);
});
port1.unref();

register('./my-hooks.mjs', {
  parentURL: pathToFileURL(__filename),
  data: { number: 1, port: port2 },
  transferList: [port2],
});拷贝