107 lines
2.9 KiB
JavaScript
107 lines
2.9 KiB
JavaScript
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#!/bin/env node
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/**
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* Usage:
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* node scripts/test-pwa-score [<url> [<min-score>]]
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*
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* Defaults:
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* url: http://localhost:4200
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* minScore: 90
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*
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* (Ignores HTTPS-related audits, when run for HTTP URL.)
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*/
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// Imports
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const lighthouse = require('lighthouse');
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const ChromeLauncher = require('lighthouse/lighthouse-cli/chrome-launcher').ChromeLauncher;
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const Printer = require('lighthouse/lighthouse-cli/printer');
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const config = require('lighthouse/lighthouse-core/config/default.json');
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// Constants
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const FLAGS = {output: 'json'};
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// Specify the path to Chrome on Travis
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if (process.env.TRAVIS) {
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process.env.LIGHTHOUSE_CHROMIUM_PATH = process.env.CHROME_BIN;
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}
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// Run
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_main(process.argv.slice(2));
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// Functions - Definitions
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function _main(args) {
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const {url, minScore} = parseInput(args);
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const isOnHttp = /^http:/.test(url);
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console.log(`Running PWA audit for '${url}'...`);
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if (isOnHttp) {
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ignoreHttpsAudits(config.aggregations);
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}
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launchChromeAndRunLighthouse(url, FLAGS, config).
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then(getScore).
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then(score => evaluateScore(minScore, score)).
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catch(onError);
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}
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function evaluateScore(expectedScore, actualScore) {
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console.log('Lighthouse PWA score:');
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console.log(` - Expected: ${expectedScore} / 100 (or higher)`);
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console.log(` - Actual: ${actualScore} / 100`);
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if (actualScore < expectedScore) {
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throw new Error(`PWA score is too low. (${actualScore} < ${expectedScore})`);
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}
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}
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function getScore(results) {
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const scoredAggregations = results.aggregations.filter(a => a.scored);
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const total = scoredAggregations.reduce((sum, a) => sum + a.total, 0);
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return Math.round((total / scoredAggregations.length) * 100);
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}
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function ignoreHttpsAudits(aggregations) {
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const httpsAudits = [
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'is-on-https',
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'redirects-http'
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];
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console.info(`Ignoring HTTPS-related audits (${httpsAudits.join(', ')})...`);
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aggregations.forEach(aggregation =>
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aggregation.items.forEach(item =>
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httpsAudits.map(key => item.audits[key]).forEach(audit =>
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// Ugly hack to ignore HTTPS-related audits (i.e. simulate them passing).
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// Only meant for use during development.
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audit && (audit.expectedValue = !audit.expectedValue))));
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}
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function launchChromeAndRunLighthouse(url, flags, config) {
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const launcher = new ChromeLauncher({autoSelectChrome: true});
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return launcher.run().
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then(() => lighthouse(url, flags, config)).
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then(results => launcher.kill().then(() => results)).
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catch(err => launcher.kill().then(() => { throw err; }, () => { throw err; }));
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}
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function onError(err) {
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console.error(err);
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process.exit(1);
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}
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function parseInput(args) {
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const url = args[0];
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const minScore = Number(args[1]);
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if (!url) {
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onError('Invalid arguments: <URL> not specified.');
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} else if (isNaN(minScore)) {
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onError('Invalid arguments: <MIN_SCORE> not specified or not a number.');
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}
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return {url, minScore};
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}
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