fix: make component construct correctly which class extends from Vue (#654)

Author: kuitos

flow/vue.flow.js

@@ -2,6 +2,6 @@
 
 // Importing these types declares them, so they are available globally
 
-declare type Component = Object // eslint-disable-line no-undef
+declare type Component = Object | Function // eslint-disable-line no-undef
 declare type VNode = Object // eslint-disable-line no-undef
 declare type SlotValue = Component | string | Array<Component> | Array<string>

packages/create-instance/create-instance.js

@@ -55,7 +55,7 @@ export default function createInstance (
 
   addEventLogger(vue)
 
-  const Constructor = vue.extend(component)
+  const Constructor = (typeof component === 'function' && component.prototype instanceof Vue) ? component : vue.extend(component)
 
   const instanceOptions = { ...options, propsData: { ...options.propsData }}
   deleteoptions(instanceOptions)