Lighthouse によるウェブアプリの監査 | Tools for Web Developers | Google Developers

整形用スクリプト

format-lighthouse-stats.js

const input = require('fs')
  .readFileSync('/dev/stdin')
  .toString()

const stats = JSON.parse(input)
const scoreMap = Object.entries(stats.audits).reduce((acc, [key, a]) => {
  if (typeof a.score === 'number') {
    return Object.assign({}, acc, {[key]: a.score })
  }
  return acc
}, {})
console.log(scoreMap)

点数を見る

$ npm i -g lighthouse # lighthouse-cli をインストール
$ lighthouse https://google.com --output json --quiet | node format-lighthouse-stats.js

{ 'first-meaningful-paint': 86,
  'speed-index-metric': 81,
  'screenshot-thumbnails': 100,
  'estimated-input-latency': 100,
  'first-interactive': 70,
  'consistently-interactive': 70,
  'image-aspect-ratio': 0,
  'total-byte-weight': 100,
  'offscreen-images': 100,
  'uses-webp-images': 100,
  'uses-optimized-images': 100,
  'uses-request-compression': 100,
  'uses-responsive-images': 100,
  'dom-size': 100,
  'link-blocking-first-paint': 100,
  'script-blocking-first-paint': 100 }