declare function objectAssignPolyfill(target: Object, ...sources: Array<Object>): Object;
declare const objectAssign: {
    <T, U>(target: T, source: U): T & U;
    <T, U, V>(target: T, source1: U, source2: V): T & U & V;
    <T, U, V, W>(target: T, source1: U, source2: V, source3: W): T & U & V & W;
    (target: object, ...sources: any[]): any;
};
export { objectAssign as default, objectAssignPolyfill, };