/**
 * The SFU makes every offer, so the only m-lines that can carry our media are the ones it
 * opened to receive on. A transceiver made here has no place in its offer and never sends.
 */
interface SfuSlot {
    mid: string;
    kind: string;
}
/** The m-lines the SFU takes media on, in offer order: recvonly, or sendrecv once it forwards on one. */
export declare function sfuSlots(pc: RTCPeerConnection): SfuSlot[];
/**
 * Puts a role's first track on a slot the SFU offered that no other sender holds. Null means no
 * slot is free or it can't be claimed here, and the caller falls back to `addTrack`.
 */
export declare function publishOnSfuSlot(pc: RTCPeerConnection, track: MediaStreamTrack, stream: MediaStream, held: readonly (RTCRtpSender | null | undefined)[]): RTCRtpSender | null;
export {};