export declare function format(first: string, middle: string, last: string): string;
export declare function isNumber(str: string | number): boolean;
export declare function formatNumber(n: string | number): string;
export declare function isNullOrUndefined(input: string): boolean;
/**
 * Check if current browser is Internet Explorer.
 *
 * @export
 * @returns {boolean}
 */
export declare function isInternetExplorer(): boolean;
/**
 * Check if string is a valid URL.
 * @param {string} urlString
 * @returns {boolean}
 */
export declare function isUrlValid(urlString: any): boolean;
/**
 * Append query parameters to image URL hosted by MapsIndoors to request with specific size or scale depending on hostname.
 * @param {string} imageURL - URL for image
 * @param {number} iconDisplaySize - The width and height that the icon should be displayed in
 * @returns string
 */
export declare function appendMapsIndoorsImageQueryParameters(imageURL: string, iconDisplaySize: number): string;