Envy: An environment variable manager

All applications need some degree of configuration. Some options can be provided as command-line flags, but often the configuration is too complex to be specified in this way. For all non-trivial configuration, applications should store configuration in the environment to stay organized and to remain portable.

Envy helps keep environment variables in order by creating a way to declaratively specify all of your app’s environment variables in one place, automatically wrap them in a module, parse them from raw strings into a variety of different datatypes, and even properly associate them with Typed Racket types.