Revert "Don't bother resolving and rendering lazy components"

This reverts commit a795d30.

The original issue has been fix in a later version of Next.js. We also
need it to get `<ExtractPlasmicQueryData />` working.

Change-Id: I4cb9bce0788f8ed4a8d70c3a1a8740bda16f1f46

Author: victoragnez

src/__tests__/suspense.test.js

@@ -386,7 +386,7 @@ describe('renderPrepass', () => {
     })
   })
 
-  describe.skip('lazy components', () => {
+  describe('lazy components', () => {
     it('supports resolving lazy components', () => {
       const value = {}
       const Inner = jest.fn((props) => expect(props.value).toBe(value))

src/__tests__/visitor.test.js

@@ -135,7 +135,7 @@ describe('visitElement', () => {
     expect(children.length).toBe(0)
   })
 
-  it.skip('resolves lazy components', () => {
+  it('resolves lazy components', () => {
     const defer = jest.fn().mockImplementation(() => {
       return Promise.resolve().then(() => Noop)
     })

src/render/lazyComponent.js

@@ -60,15 +60,14 @@ const render = (
   props: DefaultProps,
   queue: Frame[]
 ): Node => {
-  return null
-  // // Component has previously been fetched successfully,
-  // // so create the element with passed props and return it
-  // const payload = ((type._payload || type: any): LazyComponentPayload)
-  // if (payload._status === 1) {
-  //   return createElement(payload._result, props)
-  // }
+  // Component has previously been fetched successfully,
+  // so create the element with passed props and return it
+  const payload = ((type._payload || type: any): LazyComponentPayload)
+  if (payload._status === 1) {
+    return createElement(payload._result, props)
+  }
 
-  // return null
+  return null
 }
 
 export const mount = (
@@ -78,19 +77,19 @@ export const mount = (
 ): Node => {
   // If the component has not been fetched yet, suspend this component
   const payload = ((type._payload || type: any): LazyComponentPayload)
-  // if (payload._status <= 0) {
-  //   queue.push({
-  //     kind: 'frame.lazy',
-  //     contextMap: getCurrentContextMap(),
-  //     contextStore: getCurrentContextStore(),
-  //     errorFrame: getCurrentErrorFrame(),
-  //     thenable: resolve(type),
-  //     props,
-  //     type
-  //   })
+  if (payload._status <= 0) {
+    queue.push({
+      kind: 'frame.lazy',
+      contextMap: getCurrentContextMap(),
+      contextStore: getCurrentContextStore(),
+      errorFrame: getCurrentErrorFrame(),
+      thenable: resolve(type),
+      props,
+      type
+    })
 
-  //   return null
-  // }
+    return null
+  }
 
   return render(type, props, queue)
 }