export declare function extractUrlFromCssBackgroundImage(input?: string): string | null;
export declare function stripQueryParams(url?: string): string;
export declare function isValidUrl(urlString: string): boolean;
export declare function extractBaseUrlAndResource(urlString?: string | null): [string, string];
export declare function extractBaseUrl(urlString?: string | null): string;
export declare function extractResource(urlString?: string | null): string;
export declare function enforceHttps(url: string): string;