dotenv.config usage code example

Example: DOTENV_CONFIG_PATH

"scripts": {
    "lint": "tslint --project tsconfig.json",
    "build": "tsc",
    "prestart": "npm run build",
    "prestart:dev": "npm run build",
    "prestart:test": "npm run build",
    "start": "node -r dotenv/config . dotenv_config_path=./.env",
    "start:dev": "node -r dotenv/config . dotenv_config_path=./.env.dev",
    "start:test": "node -r dotenv/config . dotenv_config_path=./.env.test",
    "test": "echo \"Error: no test specified\" && exit 1"
  },