initialize()

• data <any> 数据来自 register(loader, import.meta.url, { data })。

  \data <any> The data from register(loader, import.meta.url, { data }).

initialize hook 提供了一种定义自定义函数的方法,该函数在 hooks 模块初始化时在 hooks 线程中运行。当 hooks 模块通过 register 注册时,就会进行初始化。

\The initialize hook provides a way to define a custom function that runs in the hooks thread when the hooks module is initialized. Initialization happens when the hooks module is registered via register.

该钩子可以从 register 调用接收数据,包括端口和其他可传输对象。initialize 的返回值可以是 <Promise>,在这种情况下,将在主应用线程恢复执行之前等待它。

\This hook can receive data from a register invocation, including ports and other transferrable objects. The return value of initialize can be a <Promise>, in which case it will be awaited before the main application thread execution resumes.

模块定制代码:

\Module customization code:

// path-to-my-hooks.js
export async function initialize({ number, port }) {
 port.postMessage(`increment: ${number + 1}`);
} 拷贝

调用者代码:

\Caller code:

import assert from 'node:assert';
import { register } from 'node:module';
import { MessageChannel } from 'node:worker_threads';
// This example showcases how a message channel can be used to communicate
// between the main (application) thread and the hooks running on the hooks
// thread, by sending `port2` to the `initialize` hook.
const { port1, port2 } = new MessageChannel();
port1.on('message', (msg) => {
 assert.strictEqual(msg, 'increment: 2');
});
port1.unref();
register('./path-to-my-hooks.js', {
 parentURL: import.meta.url,
 data: { number: 1, port: port2 },
 transferList: [port2],
});const assert = require('node:assert');
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
// between the main (application) thread and the hooks running on the hooks
// thread, by sending `port2` to the `initialize` hook.
const { port1, port2 } = new MessageChannel();
port1.on('message', (msg) => {
 assert.strictEqual(msg, 'increment: 2');
});
port1.unref();
register('./path-to-my-hooks.js', {
 parentURL: pathToFileURL(__filename),
 data: { number: 1, port: port2 },
 transferList: [port2],
});拷贝