/**
 * Returns true if the host string is localhost or 127.0.0.1.
 */
export declare function isLocalhost(host?: string): boolean;
/**
 * Returns true when the protocol + hostname pair represents a secure origin.
 * @param protocol - URL-style protocol string (e.g. 'https:')
 * @param hostname - hostname string (e.g. 'example.com')
 */
export declare function isSecureOrigin(protocol: string, hostname: string): boolean;
/**
 * Extracts normalized origin from a URL string, returns null on failure.
 */
export declare function tryNormalizeOrigin(value: string): string | null;
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