type voidFn = () => void
  const fn = (callback: voidFn) => {
    if(callback) callback()
  }
  const voidEvent: Event<void> = createEvent();
  fn(voidEvent); // TS2345: Argument of type 'Event ' is not assignable to parameter of type 'voidFn'.

  const voidFn: () => void = createEvent<void>()
  const voidFn1: () => void = createEvent<undefined>()
  const voidFn2: () => void = createEvent<any>()

  const event1 = createEvent<undefined>()
  event1()
  const event2 = createEvent<any>()
  event2()

  const event1 = createEvent<number>()
  event1() /* Error
    The 'this' context of type 'void' is not assignable to method's 'this' of type '"Error:
	Expected 1 argument, but got 0"'.
  */