firestore-backup v2 cloud function

index.js

const functions = require('@google-cloud/functions-framework');
const firestore = require('@google-cloud/firestore');
const client = new firestore.v1.FirestoreAdminClient();
const bucket = 'gs://[bucket-name]'
// Register a CloudEvent callback with the Functions Framework that will
// be executed when the Pub/Sub trigger topic receives a message.
functions.cloudEvent('firestore-backup', cloudEvent => {
 const databaseName = client.databasePath(
    "[project-id]",
    '(default)'
  );
  return client
    .exportDocuments({
      name: databaseName,
      outputUriPrefix: bucket,
      // Leave collectionIds empty to export all collections
      // or define a list of collection IDs:
      // collectionIds: ['users', 'posts']
      collectionIds: [],
    })
    .then(responses => {
      const response = responses[0];
      console.log(`Operation Name: ${response['name']}`);
      return response;
    })
    .catch(err => {
      console.error(err);
    });
});

package.json

{
  "dependencies": {
    "@google-cloud/functions-framework": "^3.0.0",
    "@google-cloud/firestore": "^1.3.0"
  }
}