/**
 * Pick the first LIVE track of a kind across a set of streams — used to find
 * the audio/video track the session is currently capturing with (webcam
 * observer, or an in-flight clip recording), so the checkpoint can read its
 * liveness. Ended tracks are ignored: a finished clip isn't a mic/camera
 * failure, just a finished clip.
 */
export declare function pickLiveTrack(kind: "audio" | "video", streams: Array<MediaStream | null | undefined>): MediaStreamTrack | null;
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