Yggdrasil.Config.validate-exclamation-mark

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

validate!(namespace \\ nil)

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Specs

validate!(Skogsra.Env.namespace()) :: :ok | no_return()

Validates that all required variables are present. Returns :ok if they are, raises if they're not.

It is possible to provide a namespace as argument (defaults to nil).