feat: make mixins function argument variadic

ktsn · Nov 11, 2019 · 2923163 · 2923163
1 parent 513aff1
commit 2923163
Showing 1 changed file with 15 additions and 61 deletions.
diff --git a/src/index.ts b/src/index.ts
@@ -2,67 +2,21 @@ import Vue, { VueConstructor } from 'vue'
 
 export type VueClass<T> = VueConstructor<T & Vue>
 
-export default function mixins<A>(Ctor1: VueClass<A>): VueClass<A>
-export default function mixins<A, B>(
-  Ctor1: VueClass<A>,
-  Ctor2: VueClass<B>
-): VueClass<A & B>
-export default function mixins<A, B, C>(
-  Ctor1: VueClass<A>,
-  Ctor2: VueClass<B>,
-  Ctor3: VueClass<C>
-): VueClass<A & B & C>
-export default function mixins<A, B, C, D>(
-  Ctor1: VueClass<A>,
-  Ctor2: VueClass<B>,
-  Ctor3: VueClass<C>,
-  Ctor4: VueClass<D>
-): VueClass<A & B & C & D>
-export default function mixins<A, B, C, D, E>(
-  Ctor1: VueClass<A>,
-  Ctor2: VueClass<B>,
-  Ctor3: VueClass<C>,
-  Ctor4: VueClass<D>,
-  Ctor5: VueClass<E>
-): VueClass<A & B & C & D & E>
-export default function mixins<A, B, C, D, E, F>(
-  Ctor1: VueClass<A>,
-  Ctor2: VueClass<B>,
-  Ctor3: VueClass<C>,
-  Ctor4: VueClass<D>,
-  Ctor5: VueClass<E>,
-  Ctor6: VueClass<F>
-): VueClass<A & B & C & D & E & F>
-export default function mixins<A, B, C, D, E, F, G>(
-  Ctor1: VueClass<A>,
-  Ctor2: VueClass<B>,
-  Ctor3: VueClass<C>,
-  Ctor4: VueClass<D>,
-  Ctor5: VueClass<E>,
-  Ctor6: VueClass<F>,
-  Ctor7: VueClass<G>
-): VueClass<A & B & C & D & E & F & G>
-export default function mixins<A, B, C, D, E, F, G, H>(
-  Ctor1: VueClass<A>,
-  Ctor2: VueClass<B>,
-  Ctor3: VueClass<C>,
-  Ctor4: VueClass<D>,
-  Ctor5: VueClass<E>,
-  Ctor6: VueClass<F>,
-  Ctor7: VueClass<G>,
-  Ctor8: VueClass<H>
-): VueClass<A & B & C & D & E & F & G & H>
-export default function mixins<A, B, C, D, E, F, G, H, I>(
-  Ctor1: VueClass<A>,
-  Ctor2: VueClass<B>,
-  Ctor3: VueClass<C>,
-  Ctor4: VueClass<D>,
-  Ctor5: VueClass<E>,
-  Ctor6: VueClass<F>,
-  Ctor7: VueClass<G>,
-  Ctor8: VueClass<H>,
-  Ctor9: VueClass<I>
-): VueClass<A & B & C & D & E & F & G & H & I>
+type UnionToIntersection<U> = (U extends any
+? (k: U) => void
+: never) extends (k: infer I) => void
+  ? I
+  : never
+
+export type MixedVueConstructor<
+  Ctors extends VueConstructor[]
+> = Ctors extends VueConstructor<infer Vs>[]
+  ? VueClass<UnionToIntersection<Vs>>
+  : never
+
+export default function mixins<Ctors extends VueConstructor[]>(
+  ...Ctors: Ctors
+): MixedVueConstructor<Ctors>
 export default function mixins(...Ctors: VueConstructor[]): VueConstructor {
   return Vue.extend({ mixins: Ctors })
 }