message: listener argument is mandatory
  related:
  Hope this is finally ok :\
diff: "interface": "EventTarget",
  "name": "addEventListener",
  "signatures": [
  - "addEventListener(type: string, listener?: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void"
  + "addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void"
  ]
  },
  {
  "interface": "EventTarget",
  "name": "removeEventListener",
  "signatures": [
  - "removeEventListener(type: string, listener?: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void"
  + "removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void"
  ]
  },
  {
  