export interface FindAvailablePortOptions {
    minPort?: number;
    maxPort?: number;
    random?: () => number;
    host?: string;
}
/**
 * Check if a port is available for binding.
 *
 * KNOWN LIMITATION: TOCTOU race condition - port is released immediately after check.
 * If two processes check simultaneously, both may think the port is available.
 * This is acceptable for development scripts where concurrent starts are rare.
 * The fallback logic will find another port if the race occurs.
 */
export declare const isPortAvailable: (port: number, host?: string) => Promise<boolean>;
/**
 * Find an available TCP port within a configurable range using randomized search.
 *
 * This enhanced version provides:
 * - Randomized port selection to avoid thundering herd
 * - Configurable port ranges
 * - Custom random function for deterministic testing
 * - Configurable host binding
 */
export declare function findAvailablePort(options?: FindAvailablePortOptions): Promise<number>;
/**
 * Legacy API: Find an available TCP port starting from a seed value and searching in the specified direction.
 * @deprecated Use findAvailablePort with options instead
 */
export declare function findAvailablePortSequential(startPort: number, direction?: 'up' | 'down'): Promise<number>;
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