export declare class StringUtil {
    static getInitials(nameString?: string): string;
    static revertString(str: string): string;
    static convertTimeToMinutes(timeText: string): number;
    static convertMinutesToTime(minutesTotal: number): string;
    static convertObjectToQueryString(obj: Record<string, any>): string;
    static convertToUppercaseWithoutSymbols(stringValue: string, withSpace?: boolean): string;
}