@callback autolink_options() :: [highlight_tag: String.t(), extension: String.t()]

A list of options to configure autolinking behaviour.

@callback run(ExDoc.Formatter.Config.t(), [ExDoc.ModuleNode.t()], [
  ExDoc.ExtraNode.t() | ExDoc.URLNode.t()
]) ::
  %{entrypoint: String.t(), build: [String.t()]}

The callback that must be implemented by formatters.

It receives the configuration, a list of nodes, and it must return the documentation entrypoint plus a list of files built inside the output folder.