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 deplo

Answer 1

Short answer: the GCLOUD_PROJECT environment variable will be unique to your project, hence you can utilise it like this (sample code is for 2 different projects but you can extend it using switch or any other conditional statement):

const env = process.env.GCLOUD_PROJECT === 'my-app-prod' ? 'prod' : 'dev';

then use that env variable to load intended configuration.

Full example: (TypeScript)

1. update .firebaserc file

   {
    "projects": {
       "default": "my-app-dev",
       "prod": "my-app-prod",
     }
    }
   

2. create and modify your ./somewhere/config.ts file accordingly, let's say you're using AWS services (please ensure to secure your configuration details)

   export const config = {
     dev: {
       awsRegion: 'myDevRegion',
       awsAccessKey: 'myDevKey',
       awsSecretKey: 'myDevSecretKey'
     },
     prod: {
       awsRegion: 'myProdRegion',
       awsAccessKey: 'myProdKey',
       awsSecretKey: 'myProdSecretKey'
     }
   };
   

3. now above items can be used in the index.ts file

   import { config } from './somewhere/config';
   import * as aws  from 'aws-sdk';
   . . .
   const env = process.env.GCLOUD_PROJECT === 'my-app-prod' ? 'prod' : 'dev';
   const awsCredentials = {
       region: config[env].awsRegion,
       accessKeyId: config[env].awsAccessKey,
       secretAccessKey: config[env].awsSecretKey
   };
   aws.config.update(awsCredentials);
   . . . 
   export const myFuncToUseAWS = functions....       
   

4. Now the deployment

   Dev environment deployment: $ firebase deploy --only functions -P default

   Prod environment deployment: $ firebase deploy --only functions -P prod