/**
 * Get the default portfile path.
 * @returns The path to the portfile in the system's temp directory.
 */
export declare function getPortfilePath(): string;
/**
 * Write port, PID, library path, and optionally started_at to the portfile.
 * @param portfilePath - Path to the portfile
 * @param port - Server port number
 * @param pid - Server process ID
 * @param library - Path to the library file
 * @param started_at - Optional ISO 8601 timestamp of when the server started
 */
export declare function writePortfile(portfilePath: string, port: number, pid: number, library: string, started_at?: string): Promise<void>;
/**
 * Read port, PID, library, and optionally started_at from the portfile.
 * @param portfilePath - Path to the portfile
 * @returns Object with port, pid, library (if present), and started_at (if present), or null if file doesn't exist or is invalid
 */
export declare function readPortfile(portfilePath: string): Promise<{
    port: number;
    pid: number;
    library?: string;
    started_at?: string;
} | null>;
/**
 * Check if the portfile exists.
 * @param portfilePath - Path to the portfile
 * @returns True if portfile exists, false otherwise
 */
export declare function portfileExists(portfilePath: string): Promise<boolean>;
/**
 * Remove the portfile.
 * @param portfilePath - Path to the portfile
 */
export declare function removePortfile(portfilePath: string): Promise<void>;
/**
 * Check if a process with the given PID is running.
 * @param pid - Process ID to check
 * @returns True if process is running, false otherwise
 */
export declare function isProcessRunning(pid: number): boolean;
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