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Useful helper to read and use application configuration from environment variables.

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Maybe I am wrong, but this doesn't feel to be the truth: https://github.com/Nebo15/confex/blob/fa436d139c6d7eafd6b25f9b1d31fe2de5075d43/lib/confex.ex#L52 For me, I get an `ArgumentError` when using `{:system, :integer, "ENV_NAME"}`: ```elixir ** (Mix) Could not start...

The README contains [REPLACE_OS_VARS in Distillery](https://hexdocs.pm/distillery/runtime-configuration.html#vm-args), but it links to a `404 Not Found` page. Maybe https://hexdocs.pm/distillery/config/runtime.html#option-2-vmargs could be the correct new link target?

The comment https://github.com/Nebo15/confex/blob/master/lib/confex.ex#L314 says that ArgumentError is raised when configuration cannot be resolved. This however is not true. Here you can see the configuration: ``` iex(1)> {:ok, c} = Application.fetch_env(:transporter,...

Hi all, we are using Confex in a project where we also wanted to pull config from the [AWS parameter store](https://docs.aws.amazon.com/systems-manager/latest/userguide/systems-manager-paramstore.html), I put together a [Parameter Store plugin for Confex](https://github.com/gpedic/confex_parameter_store)[1]...

Confex already provides you a way to have a compile-time config and delegate resolution of it's part to runtime. This delegation is already very explicit even though it has a...

An OTP app config with nested data structs evaluates to `nil` if at least one entry specifies system env var that is not set. ### Example: ``` config :my_app, var:...