fix: update fiber cached type, fixes #1139

Author: theKashey

examples/all-possible-containers/src/components/LazyComponent.js

@@ -0,0 +1,15 @@
+import React from 'react'
+import { EDIT_ME } from './_editMe'
+import Counter from './Counter'
+
+const LazyComponent = () => (
+  <div>
+    <fieldset>
+      <legend>Lazy Component</legend>
+      {EDIT_ME}
+      <Counter />
+    </fieldset>
+  </div>
+)
+
+export default LazyComponent

src/internal/getReactStack.js

@@ -31,6 +31,7 @@ const markUpdate = ({ fiber }) => {
   fiber.expirationTime = 1
   if (fiber.alternate) {
     fiber.alternate.expirationTime = 1
+    fiber.alternate.type = fiber.type
   }
   fiber.memoizedProps = Object.assign(
     { cacheBusterProp: true },

src/reconciler/fiberUpdater.js

@@ -9,6 +9,7 @@ const lazyConstructor = '_ctor'
 export const updateLazy = (target, type) => {
   const ctor = type[lazyConstructor]
   if (target[lazyConstructor] !== type[lazyConstructor]) {
+    // just execute `import` and RHL.register will do the job
     ctor()
   }
   if (!target[lazyConstructor].isPatchedByReactHotLoader) {