Function thirdPartyBootstrap

build-system/tasks/helpers.js:651–678

* Copies frame.html to output folder, replaces js references to minified * copies, and generates symlink to it. * * @param {string} input * @param {string} outputName * @param {!Object} options * @return {!Promise}

(input, outputName, options)

 * @return {!Promise}
 */
async function thirdPartyBootstrap(input, outputName, options) {
  const {fortesting, minify} = options;
  const destDir = `dist.3p/${minify ? internalRuntimeVersion : 'current'}`;
  await fs.ensureDir(destDir);

  if (!minify) {
    await fs.copy(input, `${destDir}/${path.basename(input)}`);
    return;
  }

  // By default we use an absolute URL, that is independent of the
  // actual frame host for the JS inside the frame.
  // But during testing we need a relative reference because the
  // version is not available on the absolute path.
  const integrationJs = fortesting
    ? './f.js'
    : `https://${hostname3p}/${internalRuntimeVersion}/f.js`;
  // Convert default relative URL to absolute min URL.
  const html = fs
    .readFileSync(input, 'utf8')
    .replace(/\.\/integration\.js/g, integrationJs);
  await fs.writeFile(`${destDir}/${outputName}`, html);
  const aliasToLatestBuild = 'dist.3p/current-min';
  if (fs.existsSync(aliasToLatestBuild)) {
    fs.unlinkSync(aliasToLatestBuild);
  }
  fs.symlinkSync('./' + internalRuntimeVersion, aliasToLatestBuild, 'dir');
}

/**
 * Returns the list of dependencies for a given JS entrypoint by having esbuild