refactor: lint and reduce size

Author: posva

packages/router/__tests__/RouterLink.spec.ts

@@ -911,7 +911,7 @@ describe('RouterLink', () => {
         `,
         components: { RouterLink },
         directives: { Directive },
-        name: 'AppLink'
+        name: 'AppLink',
       })
 
       const { wrapper } = await factory(

packages/router/src/RouterLink.ts

@@ -263,8 +263,8 @@ export function useLink<Name extends keyof RouteMap = keyof RouteMap>(
   }
 }
 
-function preferSingleVNode<T>(vnodes: T | T[]) {
-  return isArray(vnodes) && vnodes.length === 1 ? vnodes[0] : vnodes
+function preferSingleVNode(vnodes: VNode[]) {
+  return vnodes.length === 1 ? vnodes[0] : vnodes
 }
 
 export const RouterLinkImpl = /*#__PURE__*/ defineComponent({
@@ -311,7 +311,7 @@ export const RouterLinkImpl = /*#__PURE__*/ defineComponent({
     }))
 
     return () => {
-      const children = preferSingleVNode(slots.default && slots.default(link))
+      const children = slots.default && preferSingleVNode(slots.default(link))
       return props.custom
         ? children
         : h(