Adds React event component and React event target support to SSR rend…

…erer (#15242)

* Adds React event component and React event target support to SSR renderer

packages/react-dom/src/server/ReactPartialRenderer.js

@@ -22,6 +22,7 @@ import ReactSharedInternals from 'shared/ReactSharedInternals';
 import {
   warnAboutDeprecatedLifecycles,
   enableSuspenseServerRenderer,
+  enableEventAPI,
 } from 'shared/ReactFeatureFlags';
 
 import {
@@ -36,6 +37,8 @@ import {
   REACT_CONTEXT_TYPE,
   REACT_LAZY_TYPE,
   REACT_MEMO_TYPE,
+  REACT_EVENT_COMPONENT_TYPE,
+  REACT_EVENT_TARGET_TYPE,
 } from 'shared/ReactSymbols';
 
 import {
@@ -1162,6 +1165,32 @@ class ReactDOMServerRenderer {
             this.stack.push(frame);
             return '';
           }
+          case REACT_EVENT_COMPONENT_TYPE:
+          case REACT_EVENT_TARGET_TYPE: {
+            if (enableEventAPI) {
+              const nextChildren = toArray(
+                ((nextChild: any): ReactElement).props.children,
+              );
+              const frame: Frame = {
+                type: null,
+                domNamespace: parentNamespace,
+                children: nextChildren,
+                childIndex: 0,
+                context: context,
+                footer: '',
+              };
+              if (__DEV__) {
+                ((frame: any): FrameDev).debugElementStack = [];
+              }
+              this.stack.push(frame);
+              return '';
+            }
+            invariant(
+              false,
+              'ReactDOMServer does not yet support the event API.',
+            );
+          }
+          // eslint-disable-next-line-no-fallthrough
           case REACT_LAZY_TYPE:
             invariant(
               false,

packages/react-reconciler/src/__tests__/ReactFiberEvents-test-internal.js

@@ -5,7 +5,6 @@
  * LICENSE file in the root directory of this source tree.
  *
  * @emails react-core
- * @jest-environment node
  */
 
 'use strict';
@@ -16,6 +15,8 @@ let Scheduler;
 let ReactFeatureFlags;
 let EventComponent;
 let ReactTestRenderer;
+let ReactDOM;
+let ReactDOMServer;
 let EventTarget;
 let ReactEvents;
 
@@ -51,6 +52,16 @@ function initTestRenderer() {
   ReactTestRenderer = require('react-test-renderer');
 }
 
+function initReactDOM() {
+  init();
+  ReactDOM = require('react-dom');
+}
+
+function initReactDOMServer() {
+  init();
+  ReactDOMServer = require('react-dom/server');
+}
+
 // This is a new feature in Fiber so I put it in its own test file. It could
 // probably move to one of the other test files once it is official.
 describe('ReactFiberEvents', () => {
@@ -358,4 +369,213 @@ describe('ReactFiberEvents', () => {
       );
     });
   });
+
+  describe('ReactDOM', () => {
+    beforeEach(() => {
+      initReactDOM();
+      EventComponent = createReactEventComponent();
+      EventTarget = ReactEvents.TouchHitTarget;
+    });
+
+    it('should render a simple event component with a single child', () => {
+      const Test = () => (
+        <EventComponent>
+          <div>Hello world</div>
+        </EventComponent>
+      );
+      const container = document.createElement('div');
+      ReactDOM.render(<Test />, container);
+      expect(Scheduler).toFlushWithoutYielding();
+      expect(container.innerHTML).toBe('<div>Hello world</div>');
+    });
+
+    it('should warn when an event component has a direct text child', () => {
+      const Test = () => <EventComponent>Hello world</EventComponent>;
+
+      expect(() => {
+        const container = document.createElement('div');
+        ReactDOM.render(<Test />, container);
+        expect(Scheduler).toFlushWithoutYielding();
+      }).toWarnDev(
+        'Warning: validateDOMNesting: React event components cannot have text DOM nodes as children. ' +
+          'Wrap the child text "Hello world" in an element.',
+      );
+    });
+
+    it('should warn when an event component has a direct text child #2', () => {
+      const ChildWrapper = () => 'Hello world';
+      const Test = () => (
+        <EventComponent>
+          <ChildWrapper />
+        </EventComponent>
+      );
+
+      expect(() => {
+        const container = document.createElement('div');
+        ReactDOM.render(<Test />, container);
+        expect(Scheduler).toFlushWithoutYielding();
+      }).toWarnDev(
+        'Warning: validateDOMNesting: React event components cannot have text DOM nodes as children. ' +
+          'Wrap the child text "Hello world" in an element.',
+      );
+    });
+
+    it('should render a simple event component with a single event target', () => {
+      const Test = () => (
+        <EventComponent>
+          <EventTarget>
+            <div>Hello world</div>
+          </EventTarget>
+        </EventComponent>
+      );
+
+      const container = document.createElement('div');
+      ReactDOM.render(<Test />, container);
+      expect(Scheduler).toFlushWithoutYielding();
+      expect(container.innerHTML).toBe('<div>Hello world</div>');
+
+      const Test2 = () => (
+        <EventComponent>
+          <EventTarget>
+            <span>I am now a span</span>
+          </EventTarget>
+        </EventComponent>
+      );
+
+      ReactDOM.render(<Test2 />, container);
+      expect(Scheduler).toFlushWithoutYielding();
+      expect(container.innerHTML).toBe('<span>I am now a span</span>');
+    });
+
+    it('should warn when an event target has a direct text child', () => {
+      const Test = () => (
+        <EventComponent>
+          <EventTarget>Hello world</EventTarget>
+        </EventComponent>
+      );
+
+      expect(() => {
+        const container = document.createElement('div');
+        ReactDOM.render(<Test />, container);
+        expect(Scheduler).toFlushWithoutYielding();
+      }).toWarnDev([
+        'Warning: validateDOMNesting: React event targets cannot have text DOM nodes as children. ' +
+          'Wrap the child text "Hello world" in an element.',
+        'Warning: <TouchHitTarget> must have a single DOM element as a child. Found no children.',
+      ]);
+    });
+
+    it('should warn when an event target has a direct text child #2', () => {
+      const ChildWrapper = () => 'Hello world';
+      const Test = () => (
+        <EventComponent>
+          <EventTarget>
+            <ChildWrapper />
+          </EventTarget>
+        </EventComponent>
+      );
+
+      expect(() => {
+        const container = document.createElement('div');
+        ReactDOM.render(<Test />, container);
+        expect(Scheduler).toFlushWithoutYielding();
+      }).toWarnDev([
+        'Warning: validateDOMNesting: React event targets cannot have text DOM nodes as children. ' +
+          'Wrap the child text "Hello world" in an element.',
+        'Warning: <TouchHitTarget> must have a single DOM element as a child. Found no children.',
+      ]);
+    });
+
+    it('should warn when an event target has more than one child', () => {
+      const Test = () => (
+        <EventComponent>
+          <EventTarget>
+            <span>Child 1</span>
+            <span>Child 2</span>
+          </EventTarget>
+        </EventComponent>
+      );
+
+      const container = document.createElement('div');
+      expect(() => {
+        ReactDOM.render(<Test />, container);
+        expect(Scheduler).toFlushWithoutYielding();
+      }).toWarnDev(
+        'Warning: <TouchHitTarget> must only have a single DOM element as a child. Found many children.',
+      );
+      // This should not fire a warning, as this is now valid.
+      const Test2 = () => (
+        <EventComponent>
+          <EventTarget>
+            <span>Child 1</span>
+          </EventTarget>
+        </EventComponent>
+      );
+      ReactDOM.render(<Test2 />, container);
+      expect(Scheduler).toFlushWithoutYielding();
+      expect(container.innerHTML).toBe('<span>Child 1</span>');
+    });
+
+    it('should warn if an event target is not a direct child of an event component', () => {
+      const Test = () => (
+        <EventComponent>
+          <div>
+            <EventTarget>
+              <span>Child 1</span>
+            </EventTarget>
+          </div>
+        </EventComponent>
+      );
+
+      expect(() => {
+        const container = document.createElement('div');
+        ReactDOM.render(<Test />, container);
+        expect(Scheduler).toFlushWithoutYielding();
+      }).toWarnDev(
+        'Warning: validateDOMNesting: React event targets must be direct children of event components.',
+      );
+    });
+  });
+
+  describe('ReactDOMServer', () => {
+    beforeEach(() => {
+      initReactDOMServer();
+      EventComponent = createReactEventComponent();
+      EventTarget = ReactEvents.TouchHitTarget;
+    });
+
+    it('should render a simple event component with a single child', () => {
+      const Test = () => (
+        <EventComponent>
+          <div>Hello world</div>
+        </EventComponent>
+      );
+      const output = ReactDOMServer.renderToString(<Test />);
+      expect(output).toBe('<div>Hello world</div>');
+    });
+
+    it('should render a simple event component with a single event target', () => {
+      const Test = () => (
+        <EventComponent>
+          <EventTarget>
+            <div>Hello world</div>
+          </EventTarget>
+        </EventComponent>
+      );
+
+      let output = ReactDOMServer.renderToString(<Test />);
+      expect(output).toBe('<div>Hello world</div>');
+
+      const Test2 = () => (
+        <EventComponent>
+          <EventTarget>
+            <span>I am now a span</span>
+          </EventTarget>
+        </EventComponent>
+      );
+
+      output = ReactDOMServer.renderToString(<Test2 />);
+      expect(output).toBe('<span>I am now a span</span>');
+    });
+  });
 });