Elixir 1.11 is coming with config/runtime.exs and mix app.config.
Loads and configures all registered apps.
This is done by loading
config/runtime.exsif one exists.
It means.. if we move config validation from when the app starts to config/runtime.exs .. we can use this task to check the config issue upfront.
For example, I usually have a helper function on supervisor to read config and pass it to child specs. That is only executed when the supervisor starts (so requires app start).
Also… I recently found GitHub - dashbitco/nimble_options: A tiny library for validating and documenting high-level options · GitHub which is kind of related here.
