fix: add type to component instance (#828)

Author: danielroe

src/runtimeContext.ts

@@ -174,7 +174,7 @@ export interface ComponentPublicInstance {}
  */
 export declare interface ComponentInternalInstance {
   uid: number
-  // type: ConcreteComponent
+  type: Record<string, unknown> // ConcreteComponent
   parent: ComponentInternalInstance | null
   root: ComponentInternalInstance
 
@@ -239,6 +239,7 @@ export function toVue3ComponentInstance(
   const instance: ComponentInternalInstance = {
     proxy: vm,
     update: vm.$forceUpdate,
+    type: vm.$options,
     uid: vm._uid,
 
     // $emit is defined on prototype and it expected to be bound