pub const get_flash: fn(request.Request(wisp.Connection), String) -> Result(
  String,
  Nil,
)

pub const max_length: fn(
  List(#(String, String)),
  String,
  String,
  Int,
  String,
) -> List(#(String, String))

pub const min_length: fn(
  List(#(String, String)),
  String,
  String,
  Int,
  String,
) -> List(#(String, String))

pub const required: fn(
  List(#(String, String)),
  String,
  String,
  String,
) -> List(#(String, String))

pub const set_flash: fn(
  response.Response(wisp.Body),
  request.Request(wisp.Connection),
  String,
  String,
) -> response.Response(wisp.Body)