/**
 * Write PID to file. Creates parent directories if needed.
 */
export declare function writePidFile(filePath: string, pid: number): void;
/**
 * Read PID from file. Returns null if file doesn't exist or contains invalid data.
 */
export declare function readPidFile(filePath: string): number | null;
/**
 * Write port number to file. Creates parent directories if needed.
 */
export declare function writePortFile(filePath: string, port: number): void;
/**
 * Read port from file. Returns null if file doesn't exist or contains invalid data.
 */
export declare function readPortFile(filePath: string): number | null;
/**
 * Remove PID file. No-op if file doesn't exist.
 */
export declare function removePidFile(filePath: string): void;
/**
 * Remove port file. No-op if file doesn't exist.
 */
export declare function removePortFile(filePath: string): void;
/**
 * Check if a process with the given PID is running.
 * Uses kill(pid, 0) which checks existence without sending a signal.
 */
export declare function isDaemonRunning(pid: number): boolean;
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