export declare class Obj {
    /**
     * Returns whether the given object is not null and not undefined
     * @param  {any}     obj The object to test
     * @return {boolean}     True if the object is not null or undefined, otherwise false
     */
    static isNotNullOrUndefined(obj: any): boolean;
    /**
     * Returns whether the given object is null or undefined
     * @param  {any}     obj The object to test
     * @return {boolean}     True if the object is null or undefined, otherwise false
     */
    static isNullOrUndefined(obj: any): boolean;
    /**
     * Returns a clone of the given object
     * @param  {any} obj The object to clone
     * @return {any}     A clone of the object
     */
    static clone(obj: any): any;
    /**
     * Returns whether the two objects are equal
     * @param  {any}     obj1 The first object to compare
     * @param  {any}     obj2 The second object to compare
     * @return {boolean}      True of both objects contain the same keys and values, otherwise false
     */
    static equals(obj1: any, obj2: any): boolean;
    /**
     * Returns whether the given object has the given key
     * @param  {any}           obj The object to test
     * @param  {string|number} key The key to test for
     * @return {boolean}           True if the key exists in the object, otherwise false
     */
    static hasKey(obj: any, key: string | number): boolean;
}