export declare class Utils {
    static isNumber(val: any): boolean;
    static isDefined(val: any): boolean;
    static isObject(val: any): boolean;
}
export declare const RESIZE_DIRECTIONS: {
    topLeft: string;
    top: string;
    topRight: string;
    right: string;
    bottomRight: string;
    bottom: string;
    bottomLeft: string;
    left: string;
};
export declare const ALL_DIRECTIONS: string[];