Function buildExtension

build-system/tasks/extension-helpers.js:418–454

* Copies extensions from * extensions/$name/$version/$name.js * to * dist/v0/$name-$version.js * * Optionally copies the CSS at extensions/$name/$version/$name.css into * a generated JS file that can be required from the extensions as * `import {CSS} from '../../../build/$name-0.1.css';` *

(name, version, hasCss, options)

 * @return {!Promise<void>}
 */
async function buildExtension(name, version, hasCss, options) {
  options = options || {};
  if (options.compileOnlyCss && !hasCss) {
    return;
  }
  const extDir = 'extensions/' + name + '/' + version;

  // Use a separate watcher for css and jison compilation.
  // The watcher within compileJs recompiles the JS.
  if (options.watch) {
    await watchExtension(extDir, name, version, hasCss, options);
  }

  if (hasCss) {
    await buildExtensionCss(extDir, name, version);
    if (options.compileOnlyCss) {
      return;
    }
  }

  await compileJison(`${extDir}/**/*.jison`);
  if (name === 'amp-bind') {
    await doBuildJs(jsBundles, 'ww.max.js', options);
  }
  if (options.binaries) {
    await buildBinaries(extDir, options.binaries, options);
  }
  if (name === 'amp-analytics') {
    await analyticsVendorConfigs(options);
  }

  if (options.isRebuild) {
    return;
  }

  await buildExtensionJs(extDir, name, {...options, bento: false});
}

/**
 * @param {string} extDir