测量加载依赖需要多长时间

¥Measuring how long it takes to load dependencies

以下示例测量加载依赖的 require() 操作的持续时间：

¥The following example measures the duration of require() operations to load dependencies:

import { performance, PerformanceObserver } from 'node:perf_hooks';

// Activate the observer
const obs = new PerformanceObserver((list) => {
  const entries = list.getEntries();
  entries.forEach((entry) => {
    console.log(`import('${entry[0]}')`, entry.duration);
  });
  performance.clearMarks();
  performance.clearMeasures();
  obs.disconnect();
});
obs.observe({ entryTypes: ['function'], buffered: true });

const timedImport = performance.timerify(async (module) => {
  return await import(module);
});

await timedImport('some-module');'use strict';
const {
  performance,
  PerformanceObserver,
} = require('node:perf_hooks');
const mod = require('node:module');

// Monkey patch the require function
mod.Module.prototype.require =
  performance.timerify(mod.Module.prototype.require);
require = performance.timerify(require);

// Activate the observer
const obs = new PerformanceObserver((list) => {
  const entries = list.getEntries();
  entries.forEach((entry) => {
    console.log(`require('${entry[0]}')`, entry.duration);
  });
  performance.clearMarks();
  performance.clearMeasures();
  obs.disconnect();
});
obs.observe({ entryTypes: ['function'], buffered: true });

require('some-module');拷贝