google cloud functions - Firebase configuration for multiple projects/environments

Question

I'm using Cloud Functions for Firebase with three different projects for development, testing and production purposes. Each project has a service-account.json. When I deploy the sources to an environment, the initialization looks like this:

var serviceAccount = require("./service-account-dev.json");

firebase.initializeApp({
    credential: firebase.credential.cert(serviceAccount),
    databaseURL: "https://nwDEV.firebaseio.com"
});

This is a bit difficult to handle, because I have to change the code everytime I want to deploy to a different environment. Is there a way to have an overall configuration, e.g. in firebase.json or.firebasesrc, which allows to integrate the service-account and decides on deployment which configuration to choose?

Otherwise is there a possibility to detect under which environment the code is running and to load the specific service-account.json and to set the databaseURL-property?

Answer 1

Waitting for answers