import { SanitizedText } from '../../types';
/**
 * Validate text input to prevent injection attacks.
 */
export declare function validateTextInput(text: string, fieldName?: string): string;
/**
 * Sanitize control characters and dangerous Unicode sequences.
 * Centralizes all control character filtering logic.
 */
export declare function sanitizeControlChars(text: string): string;
/**
 * Validate and sanitize text content.
 */
export declare function sanitizeText(text: string): SanitizedText;