interface Event {
};
interface Error {
};
dictionary EventInit {
};
interface Sensor : EventTarget {
  readonly attribute SensorState state;
  readonly attribute SensorReading? reading;
  void start();
  void stop();
  attribute EventHandler onchange;
  attribute EventHandler onstatechange;
  attribute EventHandler onerror;
};
dictionary SensorOptions {
  double? frequency;
};
enum SensorState {
  "idle",
  "activating",
  "active",
  "errored"
};
interface SensorReading {
  readonly attribute DOMHighResTimeStamp timeStamp;
};
[Constructor(DOMString type, SensorReadingEventInit eventInitDict)]
interface SensorReadingEvent : Event {
  readonly attribute SensorReading reading;
};
dictionary SensorReadingEventInit : EventInit {
  SensorReading reading;
};
[Constructor(DOMString type, SensorErrorEventInit errorEventInitDict)]
interface SensorErrorEvent : Event {
  readonly attribute Error error;
};
dictionary SensorErrorEventInit : EventInit {
  Error error;
};