declare module 'nseventmonitor' {

  declare export class NSEventMonitor {
    start(eventMask: number, handler: () => void): void;
    stop(): void;
  }

  declare export var NSEventMask: {
    leftMouseDown: number;
    leftMouseUp: number;
    rightMouseDown: number;
    rightMouseUp: number;
    mouseMoved: number;
    leftMouseDragged: number;
    rightMouseDragged: number;
    mouseEntered: number;
    mouseExited: number;
    keyDown: number;
    keyUp: number;
    flagsChanged: number;
    appKitDefined: number;
    applicationDefined: number;
    periodic: number;
    cursorUpdate: number;
    scrollWheel: number;
    tabletPoint: number;
    tabletProximity: number;
    otherMouseDown: number;
    otherMouseUp: number;
    otherMouseDragged: number;
    gesture: number;
    magnify: number;
    swipe: number;
    rotate: number;
    beginGesture: number;
    endGesture: number;
    smartMagnify: number;
    maskPressure: number;
    directTouch: number;
    any: number;
  }
}