/**
 * Protocol utilities and signal type constants.
 *
 * Wraps the WASM `MediaProtocolHandle` into ergonomic TypeScript.
 * Channel naming, peer ID formatting, and signal types are all here.
 *
 * @example
 * ```ts
 * import { createHostSdk, SIGNAL_OFFER } from "@polkadot-apps/host-sdk";
 *
 * const sdk = await createHostSdk();
 * const channel = sdk.protocol.mediaSignalChannel("myapp", myPeerId, remotePeerId);
 * const peerId = sdk.protocol.formatPeerId(pubkeyHex);
 * ```
 */
export declare const SIGNAL_OFFER: "offer";
export declare const SIGNAL_ANSWER: "answer";
export declare const SIGNAL_CANDIDATE: "candidate";
export declare const SIGNAL_HANGUP: "hangup";
export declare const SIGNAL_RING: "ring";
export declare const SIGNAL_CONNECTED: "connected";
export declare const SIGNAL_CLOSED: "closed";
export declare const SIGNAL_REMOTE_TRACK: "remoteTrack";
/** Channel naming and peer identity utilities from host-extensions::protocol. */
export interface ProtocolUtils {
    /** Build the media signaling channel name for a directed signal (from → to). */
    mediaSignalChannel(appId: string, from: string, to: string): string;
    /** Build the media ring channel name (incoming call listener). */
    mediaRingChannel(appId: string, peerId: string): string;
    /** Build the data offer channel name (outgoing offer → target). */
    dataOfferChannel(appId: string, targetPeer: string): string;
    /** Build the data answer channel name (answer back → target). */
    dataAnswerChannel(appId: string, targetPeer: string): string;
    /** Determine which peer is the WebRTC offerer (deterministic). */
    isOfferer(localPeerId: string, remotePeerId: string): boolean;
    /** Format a public key hex into a canonical peer ID (`peer-{16hex}`). */
    formatPeerId(pubkeyHex: string): string;
}
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