import type { SynthesisEngine } from "../engine/types.js";
import type { RpcEndpoint } from "./protocol.js";
/**
 * Serve `engine` over a message port, so inference runs off the UI thread.
 *
 * Typical worker entry point:
 *
 * ```ts
 * // tts.worker.ts
 * import { ChatterboxEngine, exposeEngine } from "voxshot";
 *
 * const engine = new ChatterboxEngine({
 *   onProgress: (progress) => emitProgress(progress),
 * });
 * const { emitProgress } = exposeEngine(engine, self as unknown as RpcEndpoint);
 * ```
 *
 * @returns a function that stops serving; it also carries `emitProgress` for
 * pushing model download progress to the main thread.
 */
export declare function exposeEngine(engine: SynthesisEngine, endpoint: RpcEndpoint): (() => void) & {
    emitProgress: (progress: Record<string, unknown>) => void;
};
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