declare function set(optionalTarget: any, ...others: any[]): any;
declare function assign(target: any, ...others: any[]): any;
declare function put(target: any, ...others: any[]): any;
declare function setIfUndef(optionalTarget: any, ...others: any[]): any;
declare function assignIfUndef(target: any, ...others: any[]): any;
declare function putIfUndef(target: any, ...others: any[]): any;
export { set, assign, put, setIfUndef, assignIfUndef, putIfUndef };