Source/WebCore/Modules/mediastream/RTCTrackEvent.idl

/*
 * Copyright (C) 2015 Ericsson AB. All rights reserved.
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[
    Conditional=WEB_RTC,
    Constructor(DOMString type, RTCTrackEventInit eventInitDict),
    EnabledAtRuntime=PeerConnection,
] interface RTCTrackEvent : Event {
    readonly attribute RTCRtpReceiver receiver;
    readonly attribute MediaStreamTrack track;
    [CachedAttribute, SameObject] readonly attribute FrozenArray<MediaStream> streams;
    readonly attribute RTCRtpTransceiver transceiver;
};

dictionary RTCTrackEventInit : EventInit {
    required RTCRtpReceiver receiver;
    required MediaStreamTrack track;
    sequence<MediaStream> streams = [];
    required RTCRtpTransceiver transceiver;
};