text: // Copyright 2017, 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.
  const language = require('@google-cloud/language');
  
  // Instantiates a client
  const client = new language.LanguageServiceClient();
  
  function analyze(text) {
      const document = {
          content: text,
          type: 'PLAIN_TEXT'
      };
      return client.analyzeSentiment({ document }).then(results => {
          const sentiment = results[0];
          return sentiment.documentSentiment.score;
      });
  }
  module.exports = {
      analyze
  };