Macaroon.deserialize

You're seeing just the function deserialize, go back to Macaroon module for more information.
Link to this function

deserialize(macaroon_json, atom)

Specs

deserialize(binary(), :binary | :json) :: Macaroon.Types.Macaroon.t()

Deserializes a JSON or Base64 serialized Macaroon string

2nd argument for "type" can be :binary or :json

Returns a Macaroon.Types.Macaroon struct