Mix.Config.read-exclamation-mark

You're seeing just the function read-exclamation-mark, go back to Mix.Config module for more information.
Link to this function

read!(file, imported_paths \\ [])

View Source
This function is deprecated. Use Config.Reader.read!/2 instead.

Specs

read!(Path.t(), [Path.t()]) :: keyword()

Reads the configuration file.

The same as eval!/2 but only returns the configuration in the given file, without returning the imported paths.

It exists for convenience purposes. For example, you could invoke it inside your mix.exs to read some external data you decided to move to a configuration file:

subsystem: Mix.Config.read!("rel/subsystem.exs")