fix(types): router types fix for vue-router 3.3.3

Closes #374

Author: kevinmarrec

packages/types/config/router.d.ts

@@ -5,7 +5,10 @@
  *                https://router.vuejs.org/api/#router-construction-options
  */
 
-import { RouterOptions, RouteConfig } from 'vue-router'
+import { RouterOptions, RouteConfig as _RouteConfig } from 'vue-router'
+
+type UnionToIntersection<T> = (T extends any ? (k: T) => void : never) extends ((k: infer U) => void) ? U : never
+type RouteConfig = UnionToIntersection<_RouteConfig>
 
 export interface NuxtRouteConfig extends Pick<RouteConfig, Exclude<keyof RouteConfig, 'children' | 'component'>> {
   children?: NuxtRouteConfig[]

tsconfig.test.json

@@ -1,6 +1,6 @@
 {
   "compilerOptions": {
-    "target": "ESNext",
+    "target": "ES6",
     "lib": ["DOM", "ESNext"],
     "module": "ESNext",
     "moduleResolution": "Node",