text: // Copyright 2020, Google, Inc.
  //
  // 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.
  
  import {Option} from '../action';
  
  /**
   * @fileoverview Option reducer. Used for redux.
   */
  
  export default (state = null, action) => {
    switch (action.type) {
      case Option.ACTIVATE:
        return action.option;
      case Option.DEACTIVATE:
        return null;
      default:
        return state;
    }
  };
  