/**
 * Pick a mux transport: worker-backed where that is possible, direct where it
 * is not.
 *
 * The worker version is what keeps audio flowing while the main thread is
 * busy, so it is the default wherever a `Worker` exists. It is not always
 * available — a `Worker` needs a real document origin, and there are hosts
 * (tests, embeddings, older runtimes) with none — and a session that cannot
 * spawn one must still connect rather than fail. The direct transport is the
 * same code, just running on the calling thread.
 */
import type { MuxWorkerOptions } from "./mux-worker-protocol";
import type { BlitDebug, BlitTransport } from "../types";
/**
 * What callers use, satisfied by both. Deliberately narrow: only the four
 * methods the app actually calls, so neither implementation is obliged to
 * mirror internals nobody exercises.
 */
export type AnyMuxTransport = {
    connect(): void;
    close(): void;
    updateWtCertHash(hexHash: string, wtUrl?: string): void;
    createChannel(destName: string): BlitTransport & {
        channelId: number;
    };
};
export interface CreateMuxTransportOptions extends MuxWorkerOptions {
    debug?: BlitDebug;
    /** Force the direct transport. The worker is otherwise preferred. */
    inline?: boolean;
}
export declare function createMuxTransport(wsUrl: string, passphrase: string, options?: CreateMuxTransportOptions): AnyMuxTransport;
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