/**
 * Security Validators
 *
 * Input validation utilities for secure rendering.
 *
 * @module @kya-os/consent/security/validators
 */
/**
 * Validate that a string is a valid hex color
 *
 * Only accepts 6-digit hex colors with # prefix.
 *
 * @param color - Color string to validate
 * @returns The color if valid, undefined otherwise
 *
 * @example
 * ```typescript
 * validateColor('#2563EB') // Returns '#2563EB'
 * validateColor('2563EB')  // Returns undefined
 * validateColor('#fff')    // Returns undefined (3-digit not allowed)
 * ```
 */
export declare function validateColor(color: string | undefined): string | undefined;
/**
 * Validate that a string is a valid URL
 *
 * Only accepts http and https protocols.
 *
 * @param url - URL string to validate
 * @returns The URL if valid, undefined otherwise
 *
 * @example
 * ```typescript
 * validateUrl('https://example.com')    // Returns 'https://example.com'
 * validateUrl('javascript:alert(1)')    // Returns undefined
 * validateUrl('ftp://files.example.com') // Returns undefined
 * ```
 */
export declare function validateUrl(url: string | undefined): string | undefined;
/**
 * Validate that a string is a valid email address
 *
 * Uses a simple but effective email pattern.
 *
 * @param email - Email string to validate
 * @returns The email if valid, undefined otherwise
 */
export declare function validateEmail(email: string | undefined): string | undefined;
/**
 * Validate that a string is a valid DID
 *
 * @param did - DID string to validate
 * @returns The DID if valid, undefined otherwise
 */
export declare function validateDid(did: string | undefined): string | undefined;
/**
 * Validate that a string contains no control characters
 *
 * @param text - Text to validate
 * @returns The text if valid, undefined otherwise
 */
export declare function validateNoControlChars(text: string | undefined): string | undefined;
/**
 * Validate and sanitize a string for display
 *
 * Removes control characters and trims whitespace.
 *
 * @param text - Text to sanitize
 * @param maxLength - Maximum allowed length
 * @returns Sanitized text or undefined if invalid
 */
export declare function sanitizeDisplayText(text: string | undefined, maxLength?: number): string | undefined;
/**
 * Validate that a string is alphanumeric with underscores only
 *
 * Useful for field names and identifiers.
 *
 * @param text - Text to validate
 * @returns The text if valid, undefined otherwise
 */
export declare function validateIdentifier(text: string | undefined): string | undefined;
/**
 * Check if a value is a safe integer within range
 *
 * @param value - Value to check
 * @param min - Minimum value (inclusive)
 * @param max - Maximum value (inclusive)
 * @returns True if valid
 */
export declare function isValidInteger(value: unknown, min?: number, max?: number): value is number;
/**
 * Validate a CSRF token format
 *
 * @param token - Token to validate
 * @returns The token if valid, undefined otherwise
 */
export declare function validateCSRFToken(token: string | undefined): string | undefined;
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