fix types for demos

demos/env.d.ts

@@ -0,0 +1,8 @@
+/// <reference types="vite/client" />
+
+declare module '*.vue' {
+  import { DefineComponent } from 'vue'
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any, @typescript-eslint/ban-types
+  const component: DefineComponent<{}, {}, any>
+  export default component
+}