Fix false positive hydration warning for SVG attributes

src/renderers/dom/fiber/ReactDOMFiberComponent.js

@@ -776,6 +776,7 @@ var ReactDOMFiberComponent = {
     domElement: Element,
     tag: string,
     rawProps: Object,
+    parentNamespace: string,
     rootContainerElement: Element | Document,
   ): null | Array<mixed> {
     if (__DEV__) {
@@ -912,6 +913,8 @@ var ReactDOMFiberComponent = {
           case 'selected':
             break;
           default:
+            // Intentionally use the original name.
+            // See discussion in https://github.com/facebook/react/pull/10676.
             extraAttributeNames.add(attributes[i].name);
         }
       }
@@ -1007,8 +1010,17 @@ var ReactDOMFiberComponent = {
               nextProp,
             );
           } else {
-            // $FlowFixMe - Should be inferred as not undefined.
-            extraAttributeNames.delete(propKey.toLowerCase());
+            let ownNamespace = parentNamespace;
+            if (ownNamespace === HTML_NAMESPACE) {
+              ownNamespace = getIntrinsicNamespace(tag);
+            }
+            if (ownNamespace === HTML_NAMESPACE) {
+              // $FlowFixMe - Should be inferred as not undefined.
+              extraAttributeNames.delete(propKey.toLowerCase());
+            } else {
+              // $FlowFixMe - Should be inferred as not undefined.
+              extraAttributeNames.delete(propKey);
+            }
             serverValue = DOMPropertyOperations.getValueForAttribute(
               domElement,
               propKey,

src/renderers/dom/fiber/ReactDOMFiberEntry.js

@@ -488,13 +488,27 @@ var DOMRenderer = ReactFiberReconciler({
     type: string,
     props: Props,
     rootContainerInstance: Container,
+    hostContext: HostContext,
     internalInstanceHandle: Object,
   ): null | Array<mixed> {
     precacheFiberNode(internalInstanceHandle, instance);
     // TODO: Possibly defer this until the commit phase where all the events
     // get attached.
     updateFiberProps(instance, props);
-    return diffHydratedProperties(instance, type, props, rootContainerInstance);
+    let parentNamespace: string;
+    if (__DEV__) {
+      const hostContextDev = ((hostContext: any): HostContextDev);
+      parentNamespace = hostContextDev.namespace;
+    } else {
+      parentNamespace = ((hostContext: any): HostContextProd);
+    }
+    return diffHydratedProperties(
+      instance,
+      type,
+      props,
+      parentNamespace,
+      rootContainerInstance,
+    );
   },
 
   hydrateTextInstance(

src/renderers/dom/shared/__tests__/ReactDOMServerIntegration-test.js

@@ -1325,19 +1325,30 @@ describe('ReactDOMServerIntegration', () => {
         expect(e.namespaceURI).toBe('http://www.w3.org/2000/svg');
       });
 
-      itRenders('svg child element', async render => {
-        let e = await render(
-          <svg><image xlinkHref="http://i.imgur.com/w7GCRPb.png" /></svg>,
-        );
-        e = e.firstChild;
+      itRenders('svg child element with an attribute', async render => {
+        let e = await render(<svg viewBox="0 0 0 0" />);
         expect(e.childNodes.length).toBe(0);
-        expect(e.tagName).toBe('image');
+        expect(e.tagName).toBe('svg');
         expect(e.namespaceURI).toBe('http://www.w3.org/2000/svg');
-        expect(e.getAttributeNS('http://www.w3.org/1999/xlink', 'href')).toBe(
-          'http://i.imgur.com/w7GCRPb.png',
-        );
+        expect(e.getAttribute('viewBox')).toBe('0 0 0 0');
       });
 
+      itRenders(
+        'svg child element with a namespace attribute',
+        async render => {
+          let e = await render(
+            <svg><image xlinkHref="http://i.imgur.com/w7GCRPb.png" /></svg>,
+          );
+          e = e.firstChild;
+          expect(e.childNodes.length).toBe(0);
+          expect(e.tagName).toBe('image');
+          expect(e.namespaceURI).toBe('http://www.w3.org/2000/svg');
+          expect(e.getAttributeNS('http://www.w3.org/1999/xlink', 'href')).toBe(
+            'http://i.imgur.com/w7GCRPb.png',
+          );
+        },
+      );
+
       itRenders('svg child element with a badly cased alias', async render => {
         let e = await render(
           <svg><image xlinkhref="http://i.imgur.com/w7GCRPb.png" /></svg>,

src/renderers/shared/fiber/ReactFiberBeginWork.js

@@ -72,7 +72,7 @@ if (__DEV__) {
 module.exports = function<T, P, I, TI, PI, C, CX, PL>(
   config: HostConfig<T, P, I, TI, PI, C, CX, PL>,
   hostContext: HostContext<C, CX>,
-  hydrationContext: HydrationContext<C>,
+  hydrationContext: HydrationContext<C, CX>,
   scheduleUpdate: (fiber: Fiber, priorityLevel: PriorityLevel) => void,
   getPriorityContext: (fiber: Fiber, forceAsync: boolean) => PriorityLevel,
 ) {

src/renderers/shared/fiber/ReactFiberCompleteWork.js

@@ -50,7 +50,7 @@ var invariant = require('fbjs/lib/invariant');
 module.exports = function<T, P, I, TI, PI, C, CX, PL>(
   config: HostConfig<T, P, I, TI, PI, C, CX, PL>,
   hostContext: HostContext<C, CX>,
-  hydrationContext: HydrationContext<C>,
+  hydrationContext: HydrationContext<C, CX>,
 ) {
   const {
     createInstance,
@@ -285,6 +285,7 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
               prepareToHydrateHostInstance(
                 workInProgress,
                 rootContainerInstance,
+                currentHostContext,
               )
             ) {
               // If changes to the hydrated node needs to be applied at the

src/renderers/shared/fiber/ReactFiberHydrationContext.js

@@ -22,18 +22,22 @@ const {Deletion, Placement} = require('ReactTypeOfSideEffect');
 
 const {createFiberFromHostInstanceForDeletion} = require('ReactFiber');
 
-export type HydrationContext<C> = {
+export type HydrationContext<C, CX> = {
   enterHydrationState(fiber: Fiber): boolean,
   resetHydrationState(): void,
   tryToClaimNextHydratableInstance(fiber: Fiber): void,
-  prepareToHydrateHostInstance(fiber: Fiber, rootContainerInstance: C): boolean,
+  prepareToHydrateHostInstance(
+    fiber: Fiber,
+    rootContainerInstance: C,
+    hostContext: CX,
+  ): boolean,
   prepareToHydrateHostTextInstance(fiber: Fiber): boolean,
   popHydrationState(fiber: Fiber): boolean,
 };
 
 module.exports = function<T, P, I, TI, PI, C, CX, PL>(
   config: HostConfig<T, P, I, TI, PI, C, CX, PL>,
-): HydrationContext<C> {
+): HydrationContext<C, CX> {
   const {
     shouldSetTextContent,
     canHydrateInstance,
@@ -218,13 +222,15 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
   function prepareToHydrateHostInstance(
     fiber: Fiber,
     rootContainerInstance: C,
+    hostContext: CX,
   ): boolean {
     const instance: I = fiber.stateNode;
     const updatePayload = hydrateInstance(
       instance,
       fiber.type,
       fiber.memoizedProps,
       rootContainerInstance,
+      hostContext,
       fiber,
     );
     // TODO: Type this specific to this type of component.

src/renderers/shared/fiber/ReactFiberReconciler.js

@@ -133,6 +133,7 @@ export type HostConfig<T, P, I, TI, PI, C, CX, PL> = {
     type: T,
     props: P,
     rootContainerInstance: C,
+    hostContext: CX,
     internalInstanceHandle: OpaqueHandle,
   ) => null | PL,
   hydrateTextInstance?: (

src/renderers/shared/fiber/ReactFiberScheduler.js

@@ -152,7 +152,7 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
   config: HostConfig<T, P, I, TI, PI, C, CX, PL>,
 ) {
   const hostContext = ReactFiberHostContext(config);
-  const hydrationContext: HydrationContext<C> = ReactFiberHydrationContext(
+  const hydrationContext: HydrationContext<C, CX> = ReactFiberHydrationContext(
     config,
   );
   const {popHostContainer, popHostContext, resetHostContainer} = hostContext;