/**
 * Configuration for URL validation
 * @public
 */
export interface UrlValidationConfig {
    /** Whether to allow localhost and private IPs (useful for development) */
    allowLocalhost?: boolean;
    /** Additional ports to allow beyond the default 80, 443 */
    allowedPorts?: string[];
}
/**
 * Validates if a URL string is safe
 * @param url - The URL string to validate
 * @param config - Validation configuration
 * @returns true if the URL is safe, false if it contains malicious content
 * @public
 */
export declare function validateUrl(url: string, config?: UrlValidationConfig): boolean;
/**
 * Validates if a URL instance is safe
 * @param url - The URL instance to validate
 * @param config - Validation configuration
 * @returns true if the URL is safe, false otherwise
 * @public
 */
export declare function validateUrlInstance(url: URL, config?: UrlValidationConfig): boolean;
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