Set enableFastJSX flag to true (#30343)

When these to diffs are landed, we can merge this

- [x] D59772879
- [x] D59773043

packages/react/src/__tests__/ReactJSXRuntime-test.js

@@ -377,7 +377,7 @@ describe('ReactJSXRuntime', () => {
     expect(didCall).toBe(false);
   });
 
-  // @gate enableFastJSX && enableRefAsProp
+  // @gate enableRefAsProp
   it('does not clone props object if key and ref is not spread', async () => {
     const config = {
       foo: 'foo',

packages/react/src/jsx/ReactJSXElement.js

@@ -23,7 +23,6 @@ import {
   enableRefAsProp,
   disableStringRefs,
   disableDefaultPropsExceptForClasses,
-  enableFastJSX,
   enableOwnerStacks,
 } from 'shared/ReactFeatureFlags';
 import {checkPropStringCoercion} from 'shared/CheckStringCoercion';
@@ -82,9 +81,7 @@ if (__DEV__) {
   didWarnAboutElementRef = {};
 }
 
-const enableFastJSXWithStringRefs = enableFastJSX && enableRefAsProp;
-const enableFastJSXWithoutStringRefs =
-  enableFastJSXWithStringRefs && disableStringRefs;
+const enableFastJSXWithoutStringRefs = enableRefAsProp && disableStringRefs;
 
 function hasValidRef(config) {
   if (__DEV__) {
@@ -416,7 +413,7 @@ export function jsxProd(type, config, maybeKey) {
   let props;
   if (
     (enableFastJSXWithoutStringRefs ||
-      (enableFastJSXWithStringRefs && !('ref' in config))) &&
+      (enableRefAsProp && !('ref' in config))) &&
     !('key' in config)
   ) {
     // If key was not spread in, we can reuse the original props object. This
@@ -701,7 +698,7 @@ function jsxDEVImpl(
     let props;
     if (
       (enableFastJSXWithoutStringRefs ||
-        (enableFastJSXWithStringRefs && !('ref' in config))) &&
+        (enableRefAsProp && !('ref' in config))) &&
       !('key' in config)
     ) {
       // If key was not spread in, we can reuse the original props object. This

packages/shared/ReactFeatureFlags.js

@@ -195,7 +195,6 @@ export const enableInfiniteRenderLoopDetection = true;
 // during element creation.
 export const enableRefAsProp = true;
 export const disableStringRefs = true;
-export const enableFastJSX = true;
 
 // Warn on any usage of ReactTestRenderer
 export const enableReactTestRendererWarning = true;

packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js

@@ -19,7 +19,6 @@
 
 export const alwaysThrottleRetries = __VARIANT__;
 export const enableAddPropertiesFastPath = __VARIANT__;
-export const enableFastJSX = __VARIANT__;
 export const enableObjectFiber = __VARIANT__;
 export const enableShallowPropDiffing = __VARIANT__;
 export const passChildrenWhenCloningPersistedNodes = __VARIANT__;

packages/shared/forks/ReactFeatureFlags.native-fb.js

@@ -21,7 +21,6 @@ const dynamicFlags: DynamicExportsType = (dynamicFlagsUntyped: any);
 export const {
   alwaysThrottleRetries,
   enableAddPropertiesFastPath,
-  enableFastJSX,
   enableObjectFiber,
   enableShallowPropDiffing,
   passChildrenWhenCloningPersistedNodes,

packages/shared/forks/ReactFeatureFlags.native-oss.js

@@ -45,7 +45,6 @@ export const enableCreateEventHandleAPI = false;
 export const enableDebugTracing = false;
 export const enableDeferRootSchedulingToMicrotask = true;
 export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
-export const enableFastJSX = true;
 export const enableFilterEmptyStringAttributesDOM = true;
 export const enableFizzExternalRuntime = true;
 export const enableFlightReadableStream = true;

packages/shared/forks/ReactFeatureFlags.test-renderer.js

@@ -89,7 +89,6 @@ export const enableShallowPropDiffing = false;
 // const __NEXT_MAJOR__ = __EXPERIMENTAL__;
 export const enableRefAsProp = true;
 export const disableStringRefs = true;
-export const enableFastJSX = true;
 export const disableLegacyMode = true;
 export const disableLegacyContext = true;
 export const disableLegacyContextForFunctionComponents = true;

packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js

@@ -37,7 +37,6 @@ export const enableCreateEventHandleAPI = false;
 export const enableDebugTracing = false;
 export const enableDeferRootSchedulingToMicrotask = true;
 export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
-export const enableFastJSX = true;
 export const enableFilterEmptyStringAttributesDOM = true;
 export const enableFizzExternalRuntime = true;
 export const enableFlightReadableStream = true;

packages/shared/forks/ReactFeatureFlags.test-renderer.www.js

@@ -81,7 +81,6 @@ export const enableInfiniteRenderLoopDetection = false;
 
 export const enableRefAsProp = true;
 export const disableStringRefs = false;
-export const enableFastJSX = false;
 
 export const enableReactTestRendererWarning = false;
 export const disableLegacyMode = true;

packages/shared/forks/ReactFeatureFlags.www-dynamic.js

@@ -21,7 +21,6 @@ export const disableSchedulerTimeoutInWorkLoop = __VARIANT__;
 export const enableAddPropertiesFastPath = __VARIANT__;
 export const enableDeferRootSchedulingToMicrotask = __VARIANT__;
 export const enableDO_NOT_USE_disableStrictPassiveEffect = __VARIANT__;
-export const enableFastJSX = __VARIANT__;
 export const enableLazyContextPropagation = __VARIANT__;
 export const enableNoCloningMemoCache = __VARIANT__;
 export const enableObjectFiber = __VARIANT__;

packages/shared/forks/ReactFeatureFlags.www.js

@@ -23,7 +23,6 @@ export const {
   enableDebugTracing,
   enableDeferRootSchedulingToMicrotask,
   enableDO_NOT_USE_disableStrictPassiveEffect,
-  enableFastJSX,
   enableInfiniteRenderLoopDetection,
   enableLazyContextPropagation,
   enableNoCloningMemoCache,