/*
 * Copyright 2020 The Backstage Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

const babel = require('@babel/core');

// We build .esm.js files with plugin:build, so to be able to load these in tests they need to be transformed
// TODO: jest is working on module support, it's possible that we can remove this in the future
module.exports = {
  process(src) {
    const result = babel.transform(src, {
      babelrc: false,
      compact: false,
      plugins: [
        // This transforms the regular ESM syntax, import and export statements
        require.resolve('@babel/plugin-transform-modules-commonjs'),
        // This transforms dynamic `import()`, which is not supported yet in the Node.js VM API
        require.resolve('babel-plugin-dynamic-import-node'),
      ],
    });

    return result.code;
  },
};
