/**
 * Check if the format of a URL is valid or not.
 *
 * @param url - URL to be checked.
 * @returns True if the URL is valid, false otherwise.
 * @throws An error if URL's constructor throws an error other than `TypeError`.
 */
export declare function isValidURL(url: string): boolean;
/**
 * Safely parse a string into a URL.
 *
 * @param url - The string to parse into a URL.
 * @returns A URL object if the parsing is successful, undefined otherwise.
 */
export declare function safeParseURL(url: string): URL | undefined;
/**
 * Extracts the lowercased hostname from a URL-shaped string. Tolerates
 * bare hosts (without a scheme) and inputs that come back from APIs as
 * either `https://shop.myshopify.com` or `shop.myshopify.com`.
 *
 * @param value - A URL or bare host string, possibly null/undefined.
 * @returns The lowercased hostname, or undefined when the input is empty.
 */
export declare function extractHost(value: string | null | undefined): string | undefined;
/**
 * Extracts the subdomain handle from a `*.myshopify.com` URL or host.
 *
 * @param value - A URL or host string, possibly null/undefined.
 * @returns The myshopify subdomain handle, or undefined when the input isn't a `*.myshopify.com` URL.
 */
export declare function extractMyshopifyHandle(value: string | null | undefined): string | undefined;