export declare class AssertionError extends Error {
    constructor(message: string);
}
export declare class ObjectUtils {
    static isUndefined(obj: any): boolean;
    static isDefined(obj?: any): boolean;
    static isNotSet(obj?: any): boolean;
    static isSet(obj?: any): boolean;
    static asSet<T>(obj?: T | null, msg?: string): T;
}