declare function mixin<T, U>(t: T, u: U): T & U;
declare function mixin<T, U, V>(t: T, u: U, v: V): T & U & V;
declare function mixin<T, U, V, W>(t: T, u: U, v: V, w: W): T & U & V & W;
declare function mixin<T, U, V, W, X>(t: T, u: U, v: V, w: W, x: X): T & U & V & W & X;
declare function mixin<T, U, V, W, X, Y>(t: T, u: U, v: V, w: W, x: X, y: Y): T & U & V & W & X & Y;
export default mixin;