QNester/methodist

interface _ValidationClass
  def call: (RBS::Types::Bases::Any input) -> untyped
end

interface _SuccessResult
  def to_h: () -> Hash[keyable, untyped]

  def success?: () -> true

  def failure?: () -> false
end

interface _ValidationResultErrors
  def to_hash: () -> Hash[keyable, untyped]
  def []: (String field) -> untyped
end

interface _FailureResult
  def errors: () -> _ValidationResultErrors

  def success?: () -> true

  def failure?: () -> false
end