Source/WebCore/Modules/mediastream/RTCTrackEvent.idl

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[
    Conditional=WEB_RTC,
    Constructor(DOMString type, optional RTCTrackEventInit eventInitDict),
] interface RTCTrackEvent : Event {
   [InitializedByEventConstructor] readonly attribute RTCRtpReceiver? receiver;
   [InitializedByEventConstructor] readonly attribute MediaStreamTrack? track;
   [InitializedByEventConstructor] readonly attribute sequence<MediaStream> streams;
   [InitializedByEventConstructor] readonly attribute RTCRtpTransceiver? transceiver;
};

dictionary RTCTrackEventInit : EventInit {
    sequence<MediaStream> streams = [];

    // FIXME: The specification says that these members should be required and non-nullable.
    RTCRtpReceiver? receiver = null;
    MediaStreamTrack? track = null;
    RTCRtpTransceiver? transceiver = null;
};