Land enableLazyElements flag (#24407)

acdlite · web-flow · commit 1e748b4528ce · 2022-04-20T10:17:52.000-04:00
This flag is already enabled on all relevant surfaces. We can remove it.
diff --git a/packages/react-reconciler/src/ReactChildFiber.new.js b/packages/react-reconciler/src/ReactChildFiber.new.js
@@ -23,10 +23,7 @@ import {
 } from 'shared/ReactSymbols';
 import {ClassComponent, HostText, HostPortal, Fragment} from './ReactWorkTags';
 import isArray from 'shared/isArray';
-import {
-  warnAboutStringRefs,
-  enableLazyElements,
-} from 'shared/ReactFeatureFlags';
+import {warnAboutStringRefs} from 'shared/ReactFeatureFlags';
 import {checkPropStringCoercion} from 'shared/CheckStringCoercion';
 
 import {
@@ -414,8 +411,7 @@ function ChildReconciler(shouldTrackSideEffects) {
         // We need to do this after the Hot Reloading check above,
         // because hot reloading has different semantics than prod because
         // it doesn't resuspend. So we can't let the call below suspend.
-        (enableLazyElements &&
-          typeof elementType === 'object' &&
+        (typeof elementType === 'object' &&
           elementType !== null &&
           elementType.$$typeof === REACT_LAZY_TYPE &&
           resolveLazy(elementType) === current.type)
@@ -530,11 +526,9 @@ function ChildReconciler(shouldTrackSideEffects) {
           return created;
         }
         case REACT_LAZY_TYPE: {
-          if (enableLazyElements) {
-            const payload = newChild._payload;
-            const init = newChild._init;
-            return createChild(returnFiber, init(payload), lanes);
-          }
+          const payload = newChild._payload;
+          const init = newChild._init;
+          return createChild(returnFiber, init(payload), lanes);
         }
       }
 
@@ -601,11 +595,9 @@ function ChildReconciler(shouldTrackSideEffects) {
           }
         }
         case REACT_LAZY_TYPE: {
-          if (enableLazyElements) {
-            const payload = newChild._payload;
-            const init = newChild._init;
-            return updateSlot(returnFiber, oldFiber, init(payload), lanes);
-          }
+          const payload = newChild._payload;
+          const init = newChild._init;
+          return updateSlot(returnFiber, oldFiber, init(payload), lanes);
         }
       }
 
@@ -663,17 +655,15 @@ function ChildReconciler(shouldTrackSideEffects) {
           return updatePortal(returnFiber, matchedFiber, newChild, lanes);
         }
         case REACT_LAZY_TYPE:
-          if (enableLazyElements) {
-            const payload = newChild._payload;
-            const init = newChild._init;
-            return updateFromMap(
-              existingChildren,
-              returnFiber,
-              newIdx,
-              init(payload),
-              lanes,
-            );
-          }
+          const payload = newChild._payload;
+          const init = newChild._init;
+          return updateFromMap(
+            existingChildren,
+            returnFiber,
+            newIdx,
+            init(payload),
+            lanes,
+          );
       }
 
       if (isArray(newChild) || getIteratorFn(newChild)) {
@@ -732,14 +722,10 @@ function ChildReconciler(shouldTrackSideEffects) {
           );
           break;
         case REACT_LAZY_TYPE:
-          if (enableLazyElements) {
-            const payload = child._payload;
-            const init = (child._init: any);
-            warnOnInvalidKey(init(payload), knownKeys, returnFiber);
-            break;
-          }
-        // We intentionally fallthrough here if enableLazyElements is not on.
-        // eslint-disable-next-lined no-fallthrough
+          const payload = child._payload;
+          const init = (child._init: any);
+          warnOnInvalidKey(init(payload), knownKeys, returnFiber);
+          break;
         default:
           break;
       }
@@ -1175,8 +1161,7 @@ function ChildReconciler(shouldTrackSideEffects) {
             // We need to do this after the Hot Reloading check above,
             // because hot reloading has different semantics than prod because
             // it doesn't resuspend. So we can't let the call below suspend.
-            (enableLazyElements &&
-              typeof elementType === 'object' &&
+            (typeof elementType === 'object' &&
               elementType !== null &&
               elementType.$$typeof === REACT_LAZY_TYPE &&
               resolveLazy(elementType) === child.type)
@@ -1302,17 +1287,15 @@ function ChildReconciler(shouldTrackSideEffects) {
             ),
           );
         case REACT_LAZY_TYPE:
-          if (enableLazyElements) {
-            const payload = newChild._payload;
-            const init = newChild._init;
-            // TODO: This function is supposed to be non-recursive.
-            return reconcileChildFibers(
-              returnFiber,
-              currentFirstChild,
-              init(payload),
-              lanes,
-            );
-          }
+          const payload = newChild._payload;
+          const init = newChild._init;
+          // TODO: This function is supposed to be non-recursive.
+          return reconcileChildFibers(
+            returnFiber,
+            currentFirstChild,
+            init(payload),
+            lanes,
+          );
       }
 
       if (isArray(newChild)) {
diff --git a/packages/react-reconciler/src/ReactChildFiber.old.js b/packages/react-reconciler/src/ReactChildFiber.old.js
@@ -23,10 +23,7 @@ import {
 } from 'shared/ReactSymbols';
 import {ClassComponent, HostText, HostPortal, Fragment} from './ReactWorkTags';
 import isArray from 'shared/isArray';
-import {
-  warnAboutStringRefs,
-  enableLazyElements,
-} from 'shared/ReactFeatureFlags';
+import {warnAboutStringRefs} from 'shared/ReactFeatureFlags';
 import {checkPropStringCoercion} from 'shared/CheckStringCoercion';
 
 import {
@@ -414,8 +411,7 @@ function ChildReconciler(shouldTrackSideEffects) {
         // We need to do this after the Hot Reloading check above,
         // because hot reloading has different semantics than prod because
         // it doesn't resuspend. So we can't let the call below suspend.
-        (enableLazyElements &&
-          typeof elementType === 'object' &&
+        (typeof elementType === 'object' &&
           elementType !== null &&
           elementType.$$typeof === REACT_LAZY_TYPE &&
           resolveLazy(elementType) === current.type)
@@ -530,11 +526,9 @@ function ChildReconciler(shouldTrackSideEffects) {
           return created;
         }
         case REACT_LAZY_TYPE: {
-          if (enableLazyElements) {
-            const payload = newChild._payload;
-            const init = newChild._init;
-            return createChild(returnFiber, init(payload), lanes);
-          }
+          const payload = newChild._payload;
+          const init = newChild._init;
+          return createChild(returnFiber, init(payload), lanes);
         }
       }
 
@@ -601,11 +595,9 @@ function ChildReconciler(shouldTrackSideEffects) {
           }
         }
         case REACT_LAZY_TYPE: {
-          if (enableLazyElements) {
-            const payload = newChild._payload;
-            const init = newChild._init;
-            return updateSlot(returnFiber, oldFiber, init(payload), lanes);
-          }
+          const payload = newChild._payload;
+          const init = newChild._init;
+          return updateSlot(returnFiber, oldFiber, init(payload), lanes);
         }
       }
 
@@ -663,17 +655,15 @@ function ChildReconciler(shouldTrackSideEffects) {
           return updatePortal(returnFiber, matchedFiber, newChild, lanes);
         }
         case REACT_LAZY_TYPE:
-          if (enableLazyElements) {
-            const payload = newChild._payload;
-            const init = newChild._init;
-            return updateFromMap(
-              existingChildren,
-              returnFiber,
-              newIdx,
-              init(payload),
-              lanes,
-            );
-          }
+          const payload = newChild._payload;
+          const init = newChild._init;
+          return updateFromMap(
+            existingChildren,
+            returnFiber,
+            newIdx,
+            init(payload),
+            lanes,
+          );
       }
 
       if (isArray(newChild) || getIteratorFn(newChild)) {
@@ -732,14 +722,10 @@ function ChildReconciler(shouldTrackSideEffects) {
           );
           break;
         case REACT_LAZY_TYPE:
-          if (enableLazyElements) {
-            const payload = child._payload;
-            const init = (child._init: any);
-            warnOnInvalidKey(init(payload), knownKeys, returnFiber);
-            break;
-          }
-        // We intentionally fallthrough here if enableLazyElements is not on.
-        // eslint-disable-next-lined no-fallthrough
+          const payload = child._payload;
+          const init = (child._init: any);
+          warnOnInvalidKey(init(payload), knownKeys, returnFiber);
+          break;
         default:
           break;
       }
@@ -1175,8 +1161,7 @@ function ChildReconciler(shouldTrackSideEffects) {
             // We need to do this after the Hot Reloading check above,
             // because hot reloading has different semantics than prod because
             // it doesn't resuspend. So we can't let the call below suspend.
-            (enableLazyElements &&
-              typeof elementType === 'object' &&
+            (typeof elementType === 'object' &&
               elementType !== null &&
               elementType.$$typeof === REACT_LAZY_TYPE &&
               resolveLazy(elementType) === child.type)
@@ -1302,17 +1287,15 @@ function ChildReconciler(shouldTrackSideEffects) {
             ),
           );
         case REACT_LAZY_TYPE:
-          if (enableLazyElements) {
-            const payload = newChild._payload;
-            const init = newChild._init;
-            // TODO: This function is supposed to be non-recursive.
-            return reconcileChildFibers(
-              returnFiber,
-              currentFirstChild,
-              init(payload),
-              lanes,
-            );
-          }
+          const payload = newChild._payload;
+          const init = newChild._init;
+          // TODO: This function is supposed to be non-recursive.
+          return reconcileChildFibers(
+            returnFiber,
+            currentFirstChild,
+            init(payload),
+            lanes,
+          );
       }
 
       if (isArray(newChild)) {
diff --git a/packages/react-reconciler/src/__tests__/ReactLazy-test.internal.js b/packages/react-reconciler/src/__tests__/ReactLazy-test.internal.js
@@ -1268,7 +1268,6 @@ describe('ReactLazy', () => {
     expect(componentStackMessage).toContain('in Lazy');
   });
 
-  // @gate enableLazyElements
   it('mount and reorder lazy types', async () => {
     class Child extends React.Component {
       componentWillUnmount() {
@@ -1385,7 +1384,6 @@ describe('ReactLazy', () => {
     expect(root).toMatchRenderedOutput('ba');
   });
 
-  // @gate enableLazyElements
   it('mount and reorder lazy types (legacy mode)', async () => {
     class Child extends React.Component {
       componentDidMount() {
@@ -1474,7 +1472,6 @@ describe('ReactLazy', () => {
     expect(root).toMatchRenderedOutput('ba');
   });
 
-  // @gate enableLazyElements
   it('mount and reorder lazy elements', async () => {
     class Child extends React.Component {
       componentDidMount() {
@@ -1556,7 +1553,6 @@ describe('ReactLazy', () => {
     expect(root).toMatchRenderedOutput('ba');
   });
 
-  // @gate enableLazyElements
   it('mount and reorder lazy elements (legacy mode)', async () => {
     class Child extends React.Component {
       componentDidMount() {
diff --git a/packages/react-server/src/ReactFizzServer.js b/packages/react-server/src/ReactFizzServer.js
@@ -113,7 +113,6 @@ import {
   disableModulePatternComponents,
   warnAboutDefaultPropsOnFunctionComponents,
   enableScopeAPI,
-  enableLazyElements,
   enableSuspenseAvoidThisFallbackFizz,
 } from 'shared/ReactFeatureFlags';
 
@@ -1162,14 +1161,12 @@ function renderNodeDestructive(
         );
       // eslint-disable-next-line-no-fallthrough
       case REACT_LAZY_TYPE: {
-        if (enableLazyElements) {
-          const lazyNode: LazyComponentType<any, any> = (node: any);
-          const payload = lazyNode._payload;
-          const init = lazyNode._init;
-          const resolvedNode = init(payload);
-          renderNodeDestructive(request, task, resolvedNode);
-          return;
-        }
+        const lazyNode: LazyComponentType<any, any> = (node: any);
+        const payload = lazyNode._payload;
+        const init = lazyNode._init;
+        const resolvedNode = init(payload);
+        renderNodeDestructive(request, task, resolvedNode);
+        return;
       }
     }
 
diff --git a/packages/shared/ReactFeatureFlags.js b/packages/shared/ReactFeatureFlags.js
@@ -16,7 +16,6 @@
 export const enableSuspenseServerRenderer = true;
 export const enableSelectiveHydration = true;
 export const warnAboutDeprecatedLifecycles = true;
-export const enableLazyElements = true;
 export const enableComponentStackLocations = true;
 export const disableSchedulerTimeoutBasedOnReactExpirationTime = false;
 export const enablePersistentOffscreenHostContainer = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.native-fb.js b/packages/shared/forks/ReactFeatureFlags.native-fb.js
@@ -28,7 +28,6 @@ export const enableProfilerNestedUpdateScheduledHook = false;
 export const enableUpdaterTracking = __PROFILE__;
 export const enableSuspenseServerRenderer = false;
 export const enableSelectiveHydration = false;
-export const enableLazyElements = false;
 export const enableCache = false;
 export const enableCacheElement = true;
 export const enableSchedulerDebugging = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.native-oss.js b/packages/shared/forks/ReactFeatureFlags.native-oss.js
@@ -22,7 +22,6 @@ export const enableProfilerNestedUpdateScheduledHook = false;
 export const enableUpdaterTracking = __PROFILE__;
 export const enableSuspenseServerRenderer = false;
 export const enableSelectiveHydration = false;
-export const enableLazyElements = false;
 export const enableCache = false;
 export const enableCacheElement = false;
 export const disableJavaScriptURLs = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.js
@@ -22,7 +22,6 @@ export const enableProfilerNestedUpdateScheduledHook = false;
 export const enableUpdaterTracking = false;
 export const enableSuspenseServerRenderer = false;
 export const enableSelectiveHydration = false;
-export const enableLazyElements = false;
 export const enableCache = __EXPERIMENTAL__;
 export const enableCacheElement = __EXPERIMENTAL__;
 export const disableJavaScriptURLs = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js
@@ -22,7 +22,6 @@ export const enableProfilerNestedUpdateScheduledHook = false;
 export const enableUpdaterTracking = false;
 export const enableSuspenseServerRenderer = false;
 export const enableSelectiveHydration = false;
-export const enableLazyElements = false;
 export const enableCache = true;
 export const enableCacheElement = true;
 export const disableJavaScriptURLs = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
@@ -22,7 +22,6 @@ export const enableProfilerNestedUpdateScheduledHook = false;
 export const enableUpdaterTracking = false;
 export const enableSuspenseServerRenderer = false;
 export const enableSelectiveHydration = false;
-export const enableLazyElements = false;
 export const enableCache = true;
 export const enableCacheElement = true;
 export const enableSchedulerDebugging = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.testing.js b/packages/shared/forks/ReactFeatureFlags.testing.js
@@ -22,7 +22,6 @@ export const enableProfilerNestedUpdateScheduledHook = false;
 export const enableUpdaterTracking = false;
 export const enableSuspenseServerRenderer = false;
 export const enableSelectiveHydration = false;
-export const enableLazyElements = false;
 export const enableCache = __EXPERIMENTAL__;
 export const enableCacheElement = __EXPERIMENTAL__;
 export const disableJavaScriptURLs = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.testing.www.js b/packages/shared/forks/ReactFeatureFlags.testing.www.js
@@ -22,7 +22,6 @@ export const enableProfilerNestedUpdateScheduledHook = false;
 export const enableUpdaterTracking = false;
 export const enableSuspenseServerRenderer = true;
 export const enableSelectiveHydration = true;
-export const enableLazyElements = false;
 export const enableCache = true;
 export const enableCacheElement = true;
 export const disableJavaScriptURLs = true;
diff --git a/packages/shared/forks/ReactFeatureFlags.www.js b/packages/shared/forks/ReactFeatureFlags.www.js
