/* eslint-disable no-redeclare */
/* eslint-disable no-unused-vars */
import Vue, { VueConstructor, ComponentOptions } from 'vue';

type VueMixin = VueConstructor | ComponentOptions<never>;

export type UnionToIntersection<U> = (U extends any ? (k: U) => void : never) extends (k: infer I) => void ? I : never;

export type ExtractInstance<T> = T extends VueConstructor<infer V>
  ? V
  : T extends ComponentOptions<infer V>
  ? V
  : never;

export type MixedVueConstructor<Mixins extends VueMixin[]> = Mixins extends (infer T)[]
  ? VueConstructor<UnionToIntersection<ExtractInstance<T>> & Vue>
  : never;

export default function mixins<Mixins extends VueMixin[]>(...mixins: Mixins): MixedVueConstructor<Mixins>;
export default function mixins(...mixins: (VueConstructor | ComponentOptions<Vue>)[]): VueConstructor {
  return Vue.extend({ mixins });
}