SwiftyNotification_CenterImplementation_Extension.swift

// 1
public struct SwiftyNotificationCenter {}

// ...

// extended somewhere else in your code base
// 2
extension SwiftyNotificationCenter {
  static var buttonNotification = SwiftyNotification<String, String, Int>()
  static var anotherNotification = SwiftyNotification<String, UIColor, Bool>()
  static var theThingDidFinishNotification = SwiftyNotification<String, Void, Void>()
}