// ...

// Format for Cloud Natural Language API
const positiveDocument = {
  type: 'PLAIN_TEXT',
  content: positiveText,
};

const negativeDocument = {
  type: 'PLAIN_TEXT',
  content: negativeText,
};

// Call Cloud Natural Language API sentiment analyzer and console log results
(async () => {
  const positiveResults = await client.analyzeSentiment({ document: positiveDocument });
  const negativeResults = await client.analyzeSentiment({ document: negativeDocument });
  console.log(positiveResults);
  console.log(negativeResults);
})();