Created
October 30, 2018 16:59
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| const lighthouse = require('lighthouse'); | |
| const chromeLauncher = require('chrome-launcher'); | |
| // run this with | |
| // node lighthouseTest.js --accessibility=0.79 --seo=2 | |
| // it will fail on SEO | |
| const args = process.argv.slice(2); | |
| const requiredThresholds = [ | |
| { | |
| title: 'Accessibility', | |
| score: args[0].split(/\=/)[1], | |
| }, | |
| { | |
| title: 'SEO', | |
| score: args[1].split(/\=/)[1], | |
| }, | |
| ]; | |
| function launchChromeAndRunLighthouse(url, opts, config = null) { | |
| return chromeLauncher | |
| .launch({ chromeFlags: opts.chromeFlags }) | |
| .then(chrome => { | |
| opts.port = chrome.port; | |
| return lighthouse(url, opts, config).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'], | |
| }; | |
| function getScoresPerCategory(reportCategories, url) { | |
| const categoriesArray = Object.keys(reportCategories).map( | |
| i => reportCategories[i], | |
| ); | |
| const results = categoriesArray.map(({ title, score }) => ({ title, score })); | |
| return { results, url }; | |
| } | |
| function threshold(resultsArray, thresholds) { | |
| resultsArray.forEach(result => { | |
| thresholds.forEach(thres => { | |
| if (result.title === thres.title) { | |
| if (result.score < thres.score) { | |
| console.log( | |
| `${result.title} fails with ${ | |
| result.score | |
| }, reuquired threshold was ${thres.score}`, | |
| ); | |
| process.exit(1); | |
| } | |
| } | |
| }); | |
| }); | |
| } | |
| const url = 'https://www.bbc.co.uk/news'; | |
| launchChromeAndRunLighthouse(url, opts).then(results => { | |
| // console.log('results.categories', results.categories); | |
| const scores = getScoresPerCategory(results.categories, url); | |
| console.log(threshold(scores.results, requiredThresholds)); | |
| }); |
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