fusion-cli/build/loaders/babel-loader.js

CLI

/** Copyright (c) 2018 Uber Technologies, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow
 */
/* eslint-env node */
const {workerKey} = require('./loader-context.js');

module.exports = webpackLoader;

function webpackLoader(source /*: string */, inputSourceMap /*: Object */) {
  // Make the loader async
  const callback = this.async();
  loader.call(this, source, inputSourceMap, this._module.buildMeta).then(
    ([code, map]) => callback(null, code, map),
    (err) => callback(err)
  );
}

async function loader(source, inputSourceMap, buildMeta) {
  const filename = this.resourcePath;
  let loaderOptions = this.getOptions();
  // Use worker farm if provided, otherwise require the worker code and execute it in the same thread
  const worker = this[workerKey] || require('./babel-worker.js');

  const result = await worker.runTransformation(
    source,
    inputSourceMap,
    filename,
    loaderOptions,
    this.rootContext,
    this.sourceMap
  );

  if (result) {
    const {code, map, metadata} = result;

    if (metadata.translationIds) {
      buildMeta.fusionTranslationIds = new Set(metadata.translationIds);
    } else if (typeof buildMeta.fusionTranslationIds !== 'undefined') {
      delete buildMeta.fusionTranslationIds;
    }

    return [code, map];
  }

  // If the file was ignored, pass through the original content.
  return [source, inputSourceMap];
}