import { ValidatorFn } from '@angular/forms';
/**
 * Validator function for network ports
 *
 * @description
 * Validates that the input value is a valid network port number.
 * Accepts port numbers in the range 0-65535 (standard TCP/UDP port range).
 *
 * @example
 * ```typescript
 * // Basic usage in FormControl
 * const portControl = new FormControl('', [portValidator()]);
 *
 * // Usage in reactive forms
 * this.serverForm = this.fb.group({
 *   port: ['', [Validators.required, portValidator()]]
 * });
 *
 * // Valid inputs: 80, 443, 8080, 3000, 65535
 * // Invalid inputs: -1, 65536, 'abc', 'port'
 * ```
 *
 * @returns ValidatorFn that returns null if valid, or validation error object if invalid
 *
 * @since 2.0.0
 * @author Juvo Rafa Team
 */
export declare function portValidator(): ValidatorFn;