module T::Utils

def self.lift_enum(enum)
  unless enum.is_a?(T::Types::Enum)
    raise ArgumentError.new("#{enum.inspect} is not a T.enum")
  end
  classes = enum.values.map(&:class).uniq
  if classes.empty?
    T.untyped
  elsif classes.length > 1
    T::Types::Union.new(classes)
  else
    T::Types::Simple.new(classes.first)
  end
end