Function createEmptyBuild

build-system/tasks/visual-diff/index.js:575–590

* Creates a Percy build with only a blank page for comparison. * * Enables us to require percy checks on GitHub, and yet, not have to do a full * build for every PR. * * @param {!puppeteer.Browser} browser a Puppeteer controlled browser. * @return {Promise }

(browser)

 * @return {Promise<void>}
 */
async function createEmptyBuild(browser) {
  log('info', 'Generating the blank page snapshot');

  const page = await newPage(browser);

  try {
    await page.goto(
      `http://${HOST}:${PORT}/examples/visual-tests/blank-page/blank.html`
    );
  } catch {
    // Ignore failures
  }

  // @ts-ignore Type mismatch in library
  await percySnapshot(page, 'Blank page', SNAPSHOT_SINGLE_BUILD_OPTIONS);
}

/**
 * Runs the AMP visual diff tests.