/**
 * Task File Lock - File locking for concurrency safety
 * @requirement REQ-V2-003 - Concurrency safety
 *
 * Provides file locking to prevent race conditions when multiple
 * processes access current-task.json simultaneously.
 */
/**
 * Lock timeout error
 */
export declare class LockTimeoutError extends Error {
    constructor(message: string);
}
/**
 * Task File Lock - File locking for concurrency safety
 *
 * Responsibilities:
 * - Acquire/release file locks
 * - Handle lock timeouts
 * - Provide withLock() helper for automatic lock management
 */
export declare class TaskFileLock {
    private lockFile;
    private lockRelease;
    private lockOptions;
    constructor(contextDir?: string);
    /**
     * Acquire file lock
     *
     * @throws LockTimeoutError if lock cannot be acquired after retries
     */
    acquire(): Promise<void>;
    /**
     * Release file lock
     */
    release(): Promise<void>;
    /**
     * Execute function with lock
     *
     * Automatically acquires lock before execution and releases after.
     *
     * @param fn - Function to execute
     * @returns Result of function execution
     */
    withLock<T>(fn: () => Promise<T>): Promise<T>;
}