feat(types): better compatibility (#115)

lib/v2/index.d.ts

@@ -1,15 +1,25 @@
 import Vue from 'vue'
+import type { PluginFunction, PluginObject } from 'vue'
 declare const isVue2: boolean
 declare const isVue3: boolean
 declare const Vue2: Vue | undefined
 declare const version: string
 declare const install: (vue?: Vue) => 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: Vue
 
+/**
+ * DebuggerEvent is a Vue 3 development only feature. This type cannot exist in Vue 2.
+ */
+export declare type DebuggerEvent = never
+
+// accept no generic because Vue 3 doesn't accept any
+// https://github.com/vuejs/vue-next/pull/2758/
+export declare type Plugin = PluginObject<any> | PluginFunction<any>
+export type { VNode } from 'vue'
 export * from '@vue/composition-api'
 export {
   V as Vue,