promiseHooks.onBefore(before)

• before <Function> 在 promise 继续执行之前调用的 before 回调。
• 返回: <Function> 调用以停止钩子。 before 钩子必须是普通函数。 提供异步函数会抛出异常，因为它会产生无限微任务循环。

import { promiseHooks } from 'node:v8';

const stop = promiseHooks.onBefore((promise) => {});const { promiseHooks } = require('node:v8');

const stop = promiseHooks.onBefore((promise) => {});

• before <Function> The before callback to call before a promise continuation executes.
• Returns: <Function> Call to stop the hook.

The before hook must be a plain function. Providing an async function will throw as it would produce an infinite microtask loop.

import { promiseHooks } from 'node:v8';

const stop = promiseHooks.onBefore((promise) => {});const { promiseHooks } = require('node:v8');

const stop = promiseHooks.onBefore((promise) => {});