module State
  def enable: () -> untyped

  def disable: () -> (untyped | nil)

  def enabled?: () -> bool

  def toggle: () -> untyped
end

module UpDown
  def up: () -> untyped

  def down: () -> untyped

  def to_s: () -> ("up" | "down")

  def to_json: (*untyped _args) -> (nil | untyped)
end

class Health
  @file: untyped

  include Singleton

  include State

  include UpDown

  def initialize: () -> void

  def healthy?: () -> bool
end

class Ready
  @file: untyped

  include Singleton

  include State

  include UpDown

  def initialize: () -> void

  def ready?: () -> bool
end

class Sleep
  @file: untyped

  include Singleton

  include State

  def initialize: () -> void

  def asleep?: () -> bool

  def wake: () -> untyped

  def sleep: () -> untyped
end