Function _main

docs/tools/lighthouse-audit.mjs:66–122

* Usage: * ```sh * node tools/lighthouse-audit {{url}} {{min-scores}} [{{log-file}}] * ``` * * Runs audits against the specified URL on specific categories (accessibility, * best practices, performance, PWA, SEO). It fails, if the score in any * category is below the score specified in `{{min

(args)

 * @param args {{url}} {{min-scores}} [{{log-file}}]
 */
async function _main(args) {
  const {url, minScores} = parseInput(args);
  const isOnHttp = /^http:/.test(url);
  /**
   * @type {LH.Flags}
   */
  const lhFlags = {
    ...LIGHTHOUSE_FLAGS,
    onlyCategories: Object.keys(minScores).sort(),
  };
  /**
   * @type {LH.Config.Json}
   */
  const lhConfig = {
    extends: 'lighthouse:default',
    // Since the Angular ServiceWorker waits for the app to stabilize before
    // registering, wait a few seconds after load to allow Lighthouse to
    // reliably detect it.
    passes: [{passName: 'defaultPass', pauseAfterLoadMs: WAIT_FOR_SW_DELAY}],
  };

  await cleanupAndPrepareReportsDir();

  // Always generate report/log files.
  const logFile = path.join(reportsDir, `${url.replace(/\//g, '-')}--report.json`);

  console.log(`Running web-app audits for '${url}'...`);
  console.log(`  Audit categories: ${lhFlags.onlyCategories.join(', ')}`);

  // If testing on HTTP, skip HTTPS-specific tests.
  // (Note: Browsers special-case localhost and run ServiceWorker even on HTTP.)
  if (isOnHttp) {
    skipHttpsAudits(lhConfig);
  }

  logger.setLevel(lhFlags.logLevel);

  try {
    console.log();
    const startTime = Date.now();
    const results = await launchChromeAndRunLighthouse(url, lhFlags, lhConfig);

    if (!results) {
      onError('Lighthouse failed to return any results.');
    }
    const success = await processResults(results, minScores, logFile);
    console.log(
      `\nCompleted audit of ${url} in ${((Date.now() - startTime) / 1000).toFixed(1)}s\n`,
    );

    if (!success) {
      onError('One or more scores are below the minimum required.');
    }
  } catch (err) {
    onError(err);
  }
}