import type { CompletionEngine, ProxyConfig, RunningProxyServer, TransportId } from './types.js';
export interface StartTransportMuxRuntimeOptions {
    targetProvider: string;
    targetModel: string;
    exposedTransport: TransportId;
    authToken?: string | null;
    apiBase?: string;
    host?: string;
    port?: number;
    stream?: boolean;
    completionEngine?: CompletionEngine;
}
export interface TransportMuxRuntime extends RunningProxyServer {
    authToken?: string;
    config: ProxyConfig;
    applyHarnessEnv(env: Record<string, string>): Record<string, string>;
}
export declare function applyTransportMuxToHarnessEnv(env: Record<string, string>, transport: TransportId, proxyUrl: string, authToken: string): Record<string, string>;
export declare function startTransportMuxRuntime(options: StartTransportMuxRuntimeOptions): Promise<TransportMuxRuntime>;