import type { ManagedQvacProvider, QvacManagedOptions } from '../types.js';
export declare function tryLock(key: string): Promise<boolean>;
export declare function releaseLock(key: string): Promise<void>;
export declare function startManagedQvac(options: QvacManagedOptions): Promise<ManagedQvacProvider>;
export declare function parentIsGone(originalPpid: number, currentPpid: number): boolean;
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