Function jsifyCssAsync

build-system/tasks/css/jsify-css.js:101–112

* 'Jsify' a CSS file - Adds vendor specific css prefixes to the css file, * compresses the file, removes the copyright comment, and adds the sourceURL * to the stylesheet * * @param {string} filename css file * @return {!Promise } that resolves with the css content after * processing

(filename)

 *    processing
 */
async function jsifyCssAsync(filename) {
  const {contents, hash: filehash} = await batchedRead(filename);
  const imports = await getCssImports(filename);
  const importHashes = await Promise.all(
    imports.map(async (importedFile) => (await batchedRead(importedFile)).hash)
  );
  const hash = md5(filehash, ...importHashes, await getEnvironmentHash());
  const result = await transformCss(contents, hash, filename);

  result.warnings.forEach((warn) => log(red(warn)));
  return result.css + '\n/*# sourceURL=/' + filename + '*/';
}

/**
 * Computes the transitive closure of CSS files imported by the given file.