export declare class Util {
    static fileFieldName(fieldName: string): string;
    static complexFieldName(fieldName: string): string;
    static toDatetime(dateTime: string): Date;
    static objectAssign(target: any, source: any): any;
    static stringFormat(input: string, ...args: any[]): string;
    static numberFormat(x: number, decimal?: number): string;
    static expandTreeListValues(list: any[], root?: boolean): {
        [key: string]: any;
    }[];
    static toKendoListValues(list: any[][], caller?: any): {
        [key: string]: any;
    }[];
}