Error parsing triggers: Cannot find module 'firebase/firestore' - api

Question

I am trying to run a very basic code on google api using firebase.
'use strict';
const functions = require('firebase-functions');
const {WebhookClient} = require('dialogflow-fulfillment');
//const {Card, Suggestion} = require('dialogflow-fulfillment');
var admin = require('firebase-admin');
require("firebase/firestore");
admin.initializeApp(functions.config().firebase);
//var firestore = admin.firestore();
process.env.DEBUG = 'dialogflow:debug'; // enables lib debugging statements
//firestore arguments defined
/* var addRef = firestore.collection('Admissions');
var feeRef = firestore.collection('Fees');
*/
exports.dialogflowFirebaseFulfillment = functions.https.onRequest((request, response) => {
const agent = new WebhookClient({ request, response });
console.log('Dialogflow Request headers: ' + JSON.stringify(request.headers));
console.log('Dialogflow Request body: ' + JSON.stringify(request.body));
console.log("request.body.queryResult.parameters: ", request.body.queryResult.parameters);
// Run the proper function handler based on the matched Dialogflow intent name
var intentMap = new Map();
});
It gives me a error that says
'Error parsing triggers: Cannot find module 'firebase/firestore'.Try running "npm install" in your functions directory before deploying.
When I run npm install inside the funtions directory, I get:
audited 9161 packages in 25.878s found 292 vulnerabilities (21 low,
207 moderate, 64 high) run npm audit fix to fix them, or npm
audit for details
Its been a week, I am stuck with these errors, these errors keep fluctuating based on the solution i find. But i am not able to overcome this error. Can you please check if there is something wrong I am doing, or anything else I need to try?

Answer 1

Just delete the node_modules folder and run npm install again. I was also stuck on this for a week. It is a corrupt file issue.