how to change the path in dotenv with various script commands (in package.json) such as : start , test , etc - node.js

Question

well my problem is when I want to switch my script command in package.json like from "start" to "test" for running my Jest test which its commands like :
"scripts": {
"start": "nodemon express/***",
"serve": "node express/***",
"dev": "node express/***",
"test": "jest --watch"
},
and I call dotenv in my project like this
require("dotenv").config({
path: "express/config/.env",
});
The code above, help my to using my environment file like .env
but the problem is that when I want to test my project and I want to switch my script command (in package.json) from like "start" to "test" and change the main path of dotenv environment to something like test.env

Answer 1

You could pass the environment type as an environment variable into your program like so. Note: you will need to use cross-env if you require multi-platform support.
Unix version:
"scripts": {
"start": "NODE_ENV=production nodemon express/***",
"serve": "NODE_ENV=production node express/***",
"dev": "NODE_ENV=dev node express/***",
"test": "NODE_ENV=test jest --watch"
}
cross-env version:
"scripts": {
"start": "cross-env NODE_ENV=production nodemon express/***",
"serve": "cross-env NODE_ENV=production node express/***",
"dev": "cross-env NODE_ENV=dev node express/***",
"test": "cross-env NODE_ENV=test jest --watch"
}
And then access them using the normal method of process.env.NODE_ENV
const envVariablePaths = {
"production": "/path/here",
"dev": "path/here",
"test": "path/here",
}
require("dotenv").config({
path: envVariablePaths[process.env.NODE_ENV],
})
More documentation can be found here