/*
 * Licensed to Elasticsearch B.V. under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch B.V. licenses this file to you 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 { extname } = require('path');

const { transform } = require('babel-core');

exports.createServerCodeTransformer = (sourceMaps) => {
  return (content, path) => {
    switch (extname(path)) {
      case '.js':
        const { code = '' } = transform(content.toString('utf8'), {
          filename: path,
          ast: false,
          code: true,
          sourceMaps: sourceMaps ? 'inline' : false,
          babelrc: false,
          presets: [require.resolve('@kbn/babel-preset/webpack_preset')],
        });

        return code;

      default:
        return content.toString('utf8');
    }
  };
};
