/**
 * Lock manager abstraction for cross-tab synchronization.
 * Supports both modern Web Locks API and legacy localStorage-based locking.
 */
/** Lock manager interface - callback pattern ensures automatic lock release */
export interface ILockManager {
    /**
     * Run callback while holding a lock.
     * Lock is automatically released when callback completes or throws.
     *
     * @param key - Lock identifier
     * @param timeout - Maximum time to wait for lock acquisition (ms)
     * @param callback - Function to execute while holding the lock
     * @returns Promise resolving to callback's return value
     * @throws Error if lock cannot be acquired within timeout
     */
    runWithLock<T>(key: string, timeout: number, callback: () => Promise<T>): Promise<T>;
}
/** Web Locks API implementation - true mutex with OS-level queuing */
export declare class WebLocksApiManager implements ILockManager {
    runWithLock<T>(key: string, timeout: number, callback: () => Promise<T>): Promise<T>;
}
/** Legacy localStorage-based locking with retry logic for older browsers */
export declare class LegacyLockManager implements ILockManager {
    private lock;
    private activeLocks;
    private pagehideHandler;
    constructor();
    runWithLock<T>(key: string, timeout: number, callback: () => Promise<T>): Promise<T>;
}
export declare function getLockManager(): ILockManager;
export declare function resetLockManager(): void;