node.js - 如何以编程方式在 Lighthouse 中添加节流？

Question

我有点困惑如何使用 NodeJS 通过 Lighthouse 提供节流选项。我可以通过 bash 脚本来做到这一点：

lighthouse https://hazemhagrass.com --quiet --chrome-flags='--headless' --output=json --output-path=>hazem.json

Answer 1

下面的示例显示了如何以编程方式将 Lighthouse 作为具有自定义配置的 Node 模块运行。

const lighthouse = require('lighthouse');
const chromeLauncher = require('chrome-launcher');

function launchChromeAndRunLighthouse(url, opts, config = null) {
  return chromeLauncher.launch({
    chromeFlags: opts.chromeFlags
  }).then(chrome => {
    opts.port = chrome.port;
    const options = Object.assign({}, flags, config);
    return lighthouse(url, opts).then(results => {
      // use results.lhr for the JS-consumeable output
      // https://github.com/GoogleChrome/lighthouse/blob/master/typings/lhr.d.ts
      // use results.report for the HTML/JSON/CSV output as a string
      // use results.artifacts for the trace/screenshots/other specific case you need (rarer)
      return chrome.kill().then(() => results.lhr)
    });
  });
}

const opts = {
  chromeFlags: ['--show-paint-rects']
};

// Usage:
const config = {
  throttling: {
    rttMs: 150,
    throughputKbps: 1.6 * 1024,
    cpuSlowdownMultiplier: 4,
  }
};
launchChromeAndRunLighthouse('https://hazemhagrass.com', opts, config).then(results => {
  // Use results!
});