dictionary IdleOptions {
  unsigned long threshold;
};

[
  SecureContext,
  Constructor(optional IdleOptions options),
  Exposed=(Window,Worker)
] interface IdleDetector : EventTarget {
  readonly attribute IdleState state;
  attribute EventHandler onchange;
  Promise<any> start();
  void stop();
};

[
  SecureContext,
  Exposed=(Window,Worker)
] interface IdleState {
  readonly attribute UserIdleState user;
  readonly attribute ScreenIdleState screen;
};

enum UserIdleState {
    "active",
    "idle"
};

enum ScreenIdleState {
    "locked",
    "unlocked"
};