fix: devtools not working

Author: yuche

packages/nerv-devtools/src/devtools.ts

@@ -5,7 +5,8 @@ import {
   isWidget,
   isVText,
   isValidElement,
-  isStateless
+  isStateless,
+  isNullOrUndef
 } from 'nerv-shared'
 const isArray = Array.isArray
 /**
@@ -40,6 +41,9 @@ function normalizeChildren (children) {
  * @param {Node} node
  */
 function createReactDOMComponent (vnode) {
+  if (isNullOrUndef(vnode)) {
+    return {}
+  }
   const isText = isVText(vnode)
 
   return {

packages/nerv/src/lifecycle.ts

@@ -21,6 +21,7 @@ import FullComponent from './full-component'
 import Stateless from './stateless-component'
 import { unmount } from './vdom/unmount'
 import Ref from './vdom/ref'
+import options from './options'
 
 const readyComponents: any[] = []
 
@@ -228,6 +229,7 @@ export function updateComponent (component, isForce = false) {
         component.componentDidUpdate(prevProps, prevState, context)
       }, component)
     }
+    options.afterUpdate(vnode)
     while (vnode = vnode.parentVNode) {
       if ((vnode.vtype & (VType.Composite | VType.Stateless)) > 0) {
         vnode.dom = dom