/**
 * Copyright 2020 Google Inc. All Rights Reserved.
 * 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.
 */

// This tweak allows Webpack to completely dissolve intermediary className mappings.
// The hashed/prefixed versions of imported classNames (style.foo) get inlined where they are used.
// Example output improvement: https://gist.github.com/64b04c7d8fff564e3047226493597cc8
module.exports = function(code) {
  return code.replace(/export\s+default\s*(\{[^}]+\});?/, (s, json) => {
    try {
      const obj = JSON.parse(json);
      let out = '';
      for (let key in obj) {
        // generated CSS classes don't contain characters that require escapement
        let val = obj[key];
        out += `export const ${key} = "${val}";`;
      }
      return out;
    } catch (e) {
      return s;
    }
  });
};