Firebase functions dotenv variable undefined

Question

I'm running an update of a Firebase functions project.

Environment variables was managed with runtime environment configuration (functions.config). Regarding the recommended way in Firebase documentation, i choosed to used file-based configuration of environment variables with dotenv file format.

1 - I ran firebase functions:config:export and 4 dotenv files was created in the functions/ folder. .env.default .env. .env.dev .env.local

.env file:

# Exported firebase functions:config:export command on 24/02/2022`
MAILJET_KEY="XXXX"
MAILJET_SECRET="XXXX"
STRAVA_SECRET="XXXX"
STRAVA_ID="XXXX"

2 - I updated the source code to manage process.env.MY_VARIABLE

const mailjet = require('node-mailjet').connect(process.env.MAILJET_KEY, process.env.MAILJET_SECRET);

3 - I ran npm run serve or deploy the function but process.env.MY_VARIABLE return undefined

Error: Mailjet API_KEY is required

**Do i run a something special to migrate from functions.config to process.env ??? **

Note: I've recently managed process.env iin a new project and it's works fine !

Thx

Answer 1

My issue after the migration was that the process.env was not ready on initial emulators startup. Ref: https://github.com/firebase/firebase-tools/issues/4239#issuecomment-1063763689

functions/index.js:

import * as functions from "firebase-functions";
import * as callable from "./callables";

// Not possible
export const someFunction = someFunctionInit(process.env.APP_ENV);

So I needed to move the process.env usage within the function itself,