/**
 * Performs a deep copy of object.
 * @returns deep copy of the object
 */
export declare function deepMerge<T>(obj: T): T;
/**
 * Performs a deep merge of two objects. Does not modify objects (immutable)
 * @returns new object with merged key/values
 */
export declare function deepMerge<T, U>(obj1: T, obj2: U): T & U;
/**
 * Performs a deep merge of three objects. Does not modify objects (immutable)
 * @returns new object with merged key/values
 */
export declare function deepMerge<T, U, V>(obj1: T, obj2: U, obj3: V): T & U & V;
/**
 * Performs a deep merge of four objects. Does not modify objects (immutable)
 * @returns new object with merged key/values
 */
export declare function deepMerge<T, U, V, W>(obj1: T, obj2: U, obj3: V, obj4: W): T & U & V & W;
/**
 * Performs a deep merge of objects and returns new object. Does not modify objects (immutable)
 * @returns new object with merged key/values
 */
export declare function deepMerge(...objects: any[]): any;