/**
 * Sanitize a string input
 */
export declare function sanitizeString(value: unknown, field: string, maxLength?: number): string;
/**
 * Validate and sanitize email
 */
export declare function validateEmail(value: unknown, field?: string): string;
/**
 * Validate and sanitize URL
 */
export declare function validateUrl(value: unknown, field?: string): string;
/**
 * Validate array input
 */
export declare function validateArray<T>(value: unknown, field: string, validator?: (item: unknown, index: number) => T): T[];
/**
 * Validate object has required fields
 */
export declare function validateRequired<T extends Record<string, unknown>>(obj: T, requiredFields: (keyof T)[]): void;
/**
 * Validate pagination parameters
 */
export interface PaginationParams {
    limit: number;
    offset: number;
}
export declare function validatePagination(params: any): PaginationParams;
/**
 * Validate date string
 */
export declare function validateDate(value: unknown, field: string): string;
/**
 * Validate enum value
 */
export declare function validateEnum<T extends string>(value: unknown, validValues: readonly T[], field: string): T;
/**
 * Sanitize object by removing undefined/null values
 */
export declare function sanitizeObject<T extends Record<string, unknown>>(obj: T): Partial<T>;
/**
 * Validate request size
 */
export declare function validateRequestSize(data: unknown): void;