Cloud Function for Dialogflow Vision API Integration for Blog

index.js

'use strict';

const functions = require('firebase-functions');
const {google} = require('googleapis');
const {WebhookClient} = require('dialogflow-fulfillment');
const vision = require('@google-cloud/vision');
  /**
   * TODO(developer): Uncomment the following lines before running the sample.
   */
const bucketName = 'YOUR-BUCKET-NAME';
const timeZone = 'America/Los_Angeles';
const timeZoneOffset = '-07:00';

exports.dialogflowFirebaseFulfillment = functions.https.onRequest((request, response) => {
  const agent = new WebhookClient({ request, response });
  console.log("Parameters", agent.parameters);

  function applyML(agent){
    const filename = agent.parameters.filename;
    console.log("filename is: ", filename);

    // call vision API to detect text
    return callVisionApi(agent, bucketName, filename).then(result => {
                      console.log(`result is ${result}`);
                      agent.add(`file is being processed, here are the results:  ${result}`);
            //agent.add(`file is being processed ${result}`);
        }).catch((error)=> {
            agent.add(`error occurred at apply ml function`  + error);
        });
  }

  let intentMap = new Map();
  intentMap.set('Explore uploaded image', applyML);
  agent.handleRequest(intentMap);
});


async function callVisionApi(agent, bucketName, fileName){
    // [START vision_text_detection_gcs]
  // Imports the Google Cloud client libraries
  // Creates a client
  
  const client = new vision.ImageAnnotatorClient();
    try {
        // Performs text detection on the gcs file
        const [result] = await client.landmarkDetection(`gs://${bucketName}/${fileName}`);
        const detections = result.landmarkAnnotations;
        var detected = [];
        detections.forEach(text => {
            console.log(text.description);
            detected.push(text.description);
        });
        return detected;
    }
    catch(error) {
        console.log('fetch failed', error);
        return [];
    }
}

package.json

{
  "name": "dialogflowFirebaseFulfillment",
  "description": "Dialogflow fulfillment for the bike shop sample",
  "version": "0.0.1",
  "private": true,
  "license": "Apache Version 2.0",
  "author": "Google Inc.",
  "engines": {
    "node": "6"
  },
  "scripts": {
    "lint": "semistandard --fix \"**/*.js\"",
    "start": "firebase deploy --only functions",
    "deploy": "firebase deploy --only functions"
  },
  "dependencies": {
    "firebase-functions": "2.0.2",
    "firebase-admin": "^5.13.1",
    "actions-on-google": "2.2.0", 
    "googleapis": "^27.0.0",
    "dialogflow-fulfillment": "^0.6.1",
    "@google-cloud/bigquery": "^1.3.0",
    "@google-cloud/storage": "^2.0.0",
    "@google-cloud/vision": "^0.25.0"
  }
}

Getting "use 'esversion: 8'" next to async function callVisionApi. But if I do that, I get "Incompatible values for the 'esversion' and 'esnext' linting options"