Slow response in Dialog flow with the warning message - dialogflow-es

Question

I'm trying to use dialogflow fulfillment with the inline editor. But occasionally I get a slow response, and whenever that slow response happens, I get the following warning in the logs
Warning, estimating Firebase Config based on GCLOUD_PROJECT. Initializing firebase-admin may fail
It's weird, since I haven't required firebase-admin into my code, it's simply there in package.json as a dependency (and cannot be removed)
Here are the only things that are getting required
'use strict';
const functions = require('firebase-functions');
const {WebhookClient} = require('dialogflow-fulfillment');
const {Card, Suggestion} = require('dialogflow-fulfillment');
process.env.DEBUG = 'dialogflow:debug'; // enables lib debugging statements
And this is my package.json
{
"name": "dialogflowFirebaseFulfillment",
"description": "This is the default fulfillment for a Dialogflow agents using Cloud Functions for Firebase",
"version": "0.0.1",
"private": true,
"license": "Apache Version 2.0",
"author": "Google Inc.",
"engines": {
"node": "8"
},
"scripts": {
"start": "firebase serve --only functions:dialogflowFirebaseFulfillment",
"deploy": "firebase deploy --only functions:dialogflowFirebaseFulfillment"
},
"dependencies": {
"actions-on-google": "^2.2.0",
"firebase-admin": "^5.13.1",
"firebase-functions": "^2.0.2",
"dialogflow": "^0.6.0",
"dialogflow-fulfillment": "^0.5.0"
}
}

Answer 1

The warning message is only that - a warning. It does not mean there is a problem. It is probably happening during environment initialization when the Cloud Function is cold started - hence the slightly slower start.
If you are not using firebase-admin calls, then you have nothing to worry about.
If you are using firebase-admin, then you just need to be sure that the environment is referencing the project you expect.