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Would be nice to be able to configure which .env file to read as an environment variable. Why? Imagine a package.json with this line:

`start: dotenvx run -f .env.local -f .env -- node index.js`

Instead of the -f flag, which now cannot be overriden, one could invoke it with

`DOTENV=.env.staging npm run start`

You can, you just need to define the private key.

For example

DOTENV_PRIVATE_KEY_PRODUCTION

Would provide it with the information it needs to read .env.production

Or just have the environment variable used after the flags are processed