/**
 * Simple file-based locking using O_EXCL flag.
 *
 * Port of cc-agent-teams-impl-mcp _filelock.py.
 * Uses fs.open with O_CREAT | O_EXCL for atomic lock acquisition.
 * Spins with exponential backoff on contention.
 */
/**
 * Acquire a file lock, execute the callback, and release.
 * Uses O_CREAT | O_EXCL for atomic creation (fails if file exists).
 */
export declare function withFileLock<T>(lockPath: string, fn: () => Promise<T>, timeoutMs?: number): Promise<T>;
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