I'm currently trying to implement the Google Translate API in my nodejs app. After a some trial and error (and googling) I finally figured out how to properly instantiate a new Translate object by passing in an object with a projectId and credentials.

However, my figuring out how to do this was mostly luck. Where would I actually find the documentation from google about what should go in this constructor? The closest I've found is this documentation that shows that the constructor takes a TranslateConfig but doesn't actually explain what the config is.

const GOOGLE_CREDENTIAL = JSON.parse(process.env.GOOGLE_APPLICATION_CREDENTIAL);
async function translateText() {
  const translate = new Translate({projectId: GOOGLE_CREDENTIAL.project_id, credentials: GOOGLE_CREDENTIAL});
  let myTranslate = await translate.translate('who are you', 'es');
  console.log(myTranslate);
}

TLDR: Where do I find documentation that explains the valid arguments for this constructor?