# Added only to satisfy the Steep requirements. Not 100% reliable.
module EventEmitter
  interface _Event
    def data: -> String
    def message: -> String
    def code: -> Integer
    def reason: -> String
  end

  def add_listener: (Symbol event_name) { (_Event event) -> void } -> void
  alias on add_listener

  def remove_listener: (untyped id_or_type) -> Array[untyped]?
  def emit: (Symbol `type`, *untyped data) -> Array[untyped]
  def once: (Symbol `type`) -> Integer
end