types(router): added router array type for Array RouteConfig (#4805)

* types(router): added router array type for Array RouteConfig

* Update index.js

* Update index.js

Author: manuelojeda

packages/@vue/cli-plugin-router/generator/index.js

@@ -10,7 +10,8 @@ module.exports = (api, options = {}) => {
 
   api.render('./template', {
     historyMode: options.historyMode,
-    doesCompile: api.hasPlugin('babel') || api.hasPlugin('typescript')
+    doesCompile: api.hasPlugin('babel') || api.hasPlugin('typescript'),
+    hasTypeScript: api.hasPlugin('typescript')
   })
 
   if (api.invoking) {

packages/@vue/cli-plugin-router/generator/template/src/router/index.js

@@ -1,10 +1,18 @@
 import Vue from 'vue'
+<%_ if (hasTypeScript) { _%>
+import VueRouter, { RouteConfig } from 'vue-router'
+<%_ } else { _%>
 import VueRouter from 'vue-router'
+<%_ } _%>
 import Home from '../views/Home.vue'
 
 Vue.use(VueRouter)
 
-const routes = [
+<%_ if (hasTypeScript) { _%>
+  const routes: Array<RouteConfig> = [
+<%_ } else { _%>
+  const routes = [
+<%_ } _%>
   {
     path: '/',
     name: 'Home',