Function preBuildExperiments

build-system/tasks/dist.js:302–330

* Precompilation steps required to build experiment js binaries. * @return {Promise }

()

 * @return {Promise<void>}
 */
async function preBuildExperiments() {
  const expDir = 'tools/experiments';
  const htmlDestDir = 'dist.tools/experiments';
  const htmlSrcPath = `${expDir}/experiments.html`;
  const jsSrcPath = `${expDir}/experiments.js`;

  // Build HTML.
  const html = await fs.readFile(htmlSrcPath, 'utf8');
  const minHtml = html
    .replace(
      '/dist.tools/experiments/experiments.js',
      `https://${hostname}/v0/experiments.js`
    )
    .replace(/\$internalRuntimeVersion\$/g, VERSION);
  await fs.outputFile(`${htmlDestDir}/experiments.cdn.html`, minHtml);
  await fs.copy(htmlSrcPath, `${htmlDestDir}/${path.basename(htmlSrcPath)}`);

  // Build JS.
  const jsDir = 'build/experiments/';
  const js = await fs.readFile(jsSrcPath, 'utf8');
  const builtName = 'experiments.max.js';
  await fs.outputFile(`${jsDir}/${builtName}`, js);
  const jsFiles = await fastGlob(`${expDir}/*.js`);
  await Promise.all(
    jsFiles.map((jsFile) => {
      return fs.copy(jsFile, `${jsDir}/${path.basename(jsFile)}`);
    })
  );
}

/**
 * Build "Login Done" page.