You're seeing just the macro defnif, go back to Niffler.Library module for more information.
Link to this macro

defnif(name, inputs, outputs, list)

View Source (macro)


defnif(atom(), keyword(), keyword(), [{:do, binary()}]) ::
  {:__block__, [], [{any(), any(), any()}, ...]}

Defines a new nif function in the current module.

Same as Niffler.defnif/4 but with access to the current module context.