How to specify NODE_ENV when using NodeJS CLI app

I have a CLI app made with NodeJS and I can't figure out how to specify NODE_ENV another way than specify it everytime :

NODE_ENV=development myapp

I have two env files : .env.development and .env.production

I have a config files that manage the environment :

import dotenv from "dotenv";
dotenv.config({ path: `.env.${process.env.NODE_ENV}` });

export const config = {
	environment: process.env.NODE_ENV,
	postgres_host: process.env.POSTGRES_HOST,
	postgres_database: process.env.POSTGRES_DATABASE,
	postgres_username: process.env.POSTGRES_USERNAME,
	postgres_password: process.env.POSTGRES_PASSWORD,
	postgres_port: process.env.POSTGRES_PORT,
	telegram_api_key: process.env.TELEGRAM_API_KEY,
	telegram_chat_id: process.env.TELEGRAM_CHAT_ID
};

And I use my config object when needed :

import { config } from "../config/config.js";

export class Postgres {

	static connect() {
		this.client = new Client({
			host: config.postgres_host,
			database: config.postgres_database,
			user: config.postgres_username,
			password: config.postgres_password,
			port: config.postgres_port
		});
		this.client.connect(function(error) {
			if (error) throw error;
			console.log("Connected to PostgreSQL");
		});
	}
...

I'd like to use :

myapp 

And set the chosen environment in my index.js file or somewhere else.

#! /usr/bin/env node
import { program } from "commander";
import test from "./commands/test.js";
// Set it by default here maybe ?
program
	.command("test")
	.description("test")
	.action(test);

program.parse();

This is my package.json :

{
  "name": "myapp",
  "version": "1.0.0",
  "description": "Myapp",
  "main": "bin/index.js",
  "keywords": [
    "cli"
  ],
  "bin": {
    "myapp": "./bin/index.js"
  },
...

Do you have an idea ?

You can set a default environment to use in your config.js file. When loading your dotenv file, you can specify a default NODE_ENV value. For example, if you want to use the .env.development file by default if NODE_ENV is not specified, you can use the following line to load the dotenv file.

dotenv.config({ path: `.env.${process.env.NODE_ENV || "development"}` });

you can easily say:

myEnv = process.env.NODE_ENV || "development"

and then use myEnv instead of NODE_ENV like that:

import dotenv from "dotenv"
myEnv = process.env.NODE_ENV || "development"
dotenv.config({ path: `.env.${ myEnv }` })