import type { CallbackResult } from '../types.js';
export interface StartCallbackServerOptions {
    expectedState: string;
    timeoutMs: number;
    signal?: AbortSignal;
}
export interface CallbackServerHandle {
    port: number;
    result: Promise<CallbackResult>;
    close(): Promise<void>;
}
export declare function startCallbackServer(opts: StartCallbackServerOptions): Promise<CallbackServerHandle>;
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