import { Lifecycle, type VersionCheckState } from './Lifecycle.js';
export type VersionRecoveryReason = 'mismatch' | 'unresponsive';
/** One outstanding probe; stop invalidates both timers and late send failures. */
export declare class VersionMonitor {
    private readonly send;
    private readonly recover;
    private readonly intervalMs;
    private readonly timeoutMs;
    readonly lifecycle: Lifecycle<VersionCheckState, import("./Lifecycle.js").VersionCheckEvent>;
    private timer?;
    private requestId?;
    constructor(send: (id: string) => Promise<void>, recover: (reason: VersionRecoveryReason) => void, intervalMs?: number, timeoutMs?: number);
    start(): void;
    stop(): void;
    reply(id: string, matches: boolean): void;
    private finish;
    private schedule;
}