first implementation

frontend/node_modules/vue-demi/lib/index.d.ts

@@ -0,0 +1,22 @@
+import * as Vue from 'vue'
+declare const isVue2: boolean
+declare const isVue3: boolean
+declare const Vue2: any
+declare const install: (vue?: any) => void
+/** 
+ * @deprecated To avoid bringing in all the tree-shakable modules, this API has been deprecated. Use `Vue2` or named exports instead.
+ * Refer to https://github.com/vueuse/vue-demi/issues/41
+ */
+declare const V: typeof Vue
+
+export function set<T>(target: any, key: any, val: T): T
+export function del(target: any, key: any): void
+
+export * from 'vue'
+export {
+  V as Vue,
+  Vue2,
+  isVue2,
+  isVue3,
+  install,
+}