/**
 * Validates the protocol of the url.
 * @param url - The url to validate.
 */
export declare function validateProtocol(url: string): void;
/**
 * Checks if the url is a localhost url.
 * @param urlString - The url to check.
 * @returns True if the url is a localhost url, false otherwise.
 */
export declare function isLocalhostUrl(urlString: string): boolean;
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