events.nim

# input.nim

event InputEvent:
  time: uint32
  MouseDown, MouseUp:
    mousePosition: Point
  KeyUp, KeyDown:
    keysym: KeySym

# In module 1

event Module1Event:
  data1: int
  data2: string

# In module 2

import
  events,
  module1,
  input

subscribe Module1Event(data1: int, data2: string) =
  [...]

# Both of the following would be equal?

subscribe InputEvent =
  case event.kind
  of MouseDown:
    "[time: $1, pos: $2]" % [$event.time, $event.mousePosition]

subscribe InputEvent.MouseDown(time: uint32, mousePosition: Point) =
  "[time: $1, pos: $2]" % [$event.time, $event.mousePosition]