diff --git a/Libraries/Renderer/REVISION b/Libraries/Renderer/REVISION
index 4d4a836a18ad74..3455723424e22f 100644
--- a/Libraries/Renderer/REVISION
+++ b/Libraries/Renderer/REVISION
@@ -1 +1 @@
-3ff2c7ccd4d174786aed0f16cc0dd784816ae977
\ No newline at end of file
+6bf5e859860938b8cb7153ee928c01ad45656969
\ No newline at end of file
diff --git a/Libraries/Renderer/oss/ReactFabric-dev.js b/Libraries/Renderer/oss/ReactFabric-dev.js
index 1b716029b4ac87..6cd1ed2407d89d 100644
--- a/Libraries/Renderer/oss/ReactFabric-dev.js
+++ b/Libraries/Renderer/oss/ReactFabric-dev.js
@@ -2441,14 +2441,8 @@ var ResponderEventPlugin = {
   }
 };
 
-var customBubblingEventTypes$1 =
-  ReactNativeViewConfigRegistry.customBubblingEventTypes;
-var customDirectEventTypes$1 =
-  ReactNativeViewConfigRegistry.customDirectEventTypes;
-var eventTypes$2 = ReactNativeViewConfigRegistry.eventTypes;
-
 var ReactNativeBridgeEventPlugin = {
-  eventTypes: eventTypes$2,
+  eventTypes: ReactNativeViewConfigRegistry.eventTypes,
 
   /**
    * @see {EventPluginHub.extractEvents}
@@ -2463,8 +2457,10 @@ var ReactNativeBridgeEventPlugin = {
       // Probably a node belonging to another renderer's tree.
       return null;
     }
-    var bubbleDispatchConfig = customBubblingEventTypes$1[topLevelType];
-    var directDispatchConfig = customDirectEventTypes$1[topLevelType];
+    var bubbleDispatchConfig =
+      ReactNativeViewConfigRegistry.customBubblingEventTypes[topLevelType];
+    var directDispatchConfig =
+      ReactNativeViewConfigRegistry.customDirectEventTypes[topLevelType];
     invariant(
       bubbleDispatchConfig || directDispatchConfig,
       'Unsupported top level event type "%s" dispatched',
@@ -3639,7 +3635,7 @@ var unhideTextInstance = shim;
 function shim$1() {
   invariant(
     false,
-    "The current renderer does not support hyration. " +
+    "The current renderer does not support hydration. " +
       "This error is likely caused by a bug in React. " +
       "Please file an issue."
   );
@@ -3906,10 +3902,10 @@ function shouldSetTextContent(type, props) {
 
 // The Fabric renderer is secondary to the existing React Native renderer.
 var isPrimaryRenderer = false;
-var now = now$1;
-var scheduleDeferredCallback = scheduleDeferredCallback$1;
-var cancelDeferredCallback = cancelDeferredCallback$1;
-var shouldYield = shouldYield$1;
+var now$$1 = now$1;
+var scheduleDeferredCallback$$1 = scheduleDeferredCallback$1;
+var cancelDeferredCallback$$1 = cancelDeferredCallback$1;
+var shouldYield$$1 = shouldYield$1;
 
 var scheduleTimeout = setTimeout;
 var cancelTimeout = clearTimeout;
@@ -4035,13 +4031,14 @@ var ReactDebugCurrentFrame = ReactSharedInternals.ReactDebugCurrentFrame;
 
 function describeFiber(fiber) {
   switch (fiber.tag) {
-    case IndeterminateComponent:
-    case LazyComponent:
-    case FunctionComponent:
-    case ClassComponent:
-    case HostComponent:
-    case Mode:
-    case SuspenseComponent:
+    case HostRoot:
+    case HostPortal:
+    case HostText:
+    case Fragment:
+    case ContextProvider:
+    case ContextConsumer:
+      return "";
+    default:
       var owner = fiber._debugOwner;
       var source = fiber._debugSource;
       var name = getComponentName(fiber.type);
@@ -4050,8 +4047,6 @@ function describeFiber(fiber) {
         ownerName = getComponentName(owner.type);
       }
       return describeComponentFrame(name, source, ownerName);
-    default:
-      return "";
   }
 }
 
@@ -5138,6 +5133,23 @@ function FiberNode(tag, pendingProps, key, mode) {
   this.alternate = null;
 
   if (enableProfilerTimer) {
+    // Note: The following is done to avoid a v8 deopt.
+    //
+    // It is important to initialize the fields below with doubles.
+    // Otherwise Fibers will deopt and end up having separate shapes when
+    // doubles are later assigned to fields that initially contained smis.
+    // This is a bug in v8 having something to do with Object.preventExtension().
+    //
+    // Learn more about this deopt here:
+    // https://github.com/facebook/react/issues/14365
+    // https://bugs.chromium.org/p/v8/issues/detail?id=8538
+    this.actualDuration = Number.NaN;
+    this.actualStartTime = Number.NaN;
+    this.selfBaseDuration = Number.NaN;
+    this.treeBaseDuration = Number.NaN;
+
+    // It's okay to replace the initial doubles with smis after initialization.
+    // This simplifies other profiler code and doesn't trigger the deopt.
     this.actualDuration = 0;
     this.actualStartTime = -1;
     this.selfBaseDuration = 0;
@@ -7350,7 +7362,7 @@ function cloneHook(hook) {
   return {
     memoizedState: hook.memoizedState,
 
-    baseState: hook.memoizedState,
+    baseState: hook.baseState,
     queue: hook.queue,
     baseUpdate: hook.baseUpdate,
 
@@ -7601,15 +7613,6 @@ function useRef(initialValue) {
   return ref;
 }
 
-function useMutationEffect(create, inputs) {
-  useEffectImpl(
-    Snapshot | Update,
-    UnmountSnapshot | MountMutation,
-    create,
-    inputs
-  );
-}
-
 function useLayoutEffect(create, inputs) {
   useEffectImpl(Update, UnmountMutation | MountLayout, create, inputs);
 }
@@ -7657,28 +7660,23 @@ function useImperativeMethods(ref, create, inputs) {
   // TODO: I've implemented this on top of useEffect because it's almost the
   // same thing, and it would require an equal amount of code. It doesn't seem
   // like a common enough use case to justify the additional size.
-  useEffectImpl(
-    Update,
-    UnmountMutation | MountLayout,
-    function() {
-      if (typeof ref === "function") {
-        var refCallback = ref;
-        var _inst = create();
-        refCallback(_inst);
-        return function() {
-          return refCallback(null);
-        };
-      } else if (ref !== null && ref !== undefined) {
-        var refObject = ref;
-        var _inst2 = create();
-        refObject.current = _inst2;
-        return function() {
-          refObject.current = null;
-        };
-      }
-    },
-    nextInputs
-  );
+  useLayoutEffect(function() {
+    if (typeof ref === "function") {
+      var refCallback = ref;
+      var _inst = create();
+      refCallback(_inst);
+      return function() {
+        return refCallback(null);
+      };
+    } else if (ref !== null && ref !== undefined) {
+      var refObject = ref;
+      var _inst2 = create();
+      refObject.current = _inst2;
+      return function() {
+        refObject.current = null;
+      };
+    }
+  }, nextInputs);
 }
 
 function useCallback(callback, inputs) {
@@ -7870,7 +7868,7 @@ function recordCommitTime() {
   if (!enableProfilerTimer) {
     return;
   }
-  commitTime = now();
+  commitTime = now$$1();
 }
 
 function startProfilerTimer(fiber) {
@@ -7878,10 +7876,10 @@ function startProfilerTimer(fiber) {
     return;
   }
 
-  profilerStartTime = now();
+  profilerStartTime = now$$1();
 
   if (fiber.actualStartTime < 0) {
-    fiber.actualStartTime = now();
+    fiber.actualStartTime = now$$1();
   }
 }
 
@@ -7898,7 +7896,7 @@ function stopProfilerTimerIfRunningAndRecordDelta(fiber, overrideBaseTime) {
   }
 
   if (profilerStartTime >= 0) {
-    var elapsedTime = now() - profilerStartTime;
+    var elapsedTime = now$$1() - profilerStartTime;
     fiber.actualDuration += elapsedTime;
     if (overrideBaseTime) {
       fiber.selfBaseDuration = elapsedTime;
@@ -10782,12 +10780,14 @@ var didWarnAboutBadClass = void 0;
 var didWarnAboutContextTypeOnFunctionComponent = void 0;
 var didWarnAboutGetDerivedStateOnFunctionComponent = void 0;
 var didWarnAboutFunctionRefs = void 0;
+var didWarnAboutReassigningProps = void 0;
 
 {
   didWarnAboutBadClass = {};
   didWarnAboutContextTypeOnFunctionComponent = {};
   didWarnAboutGetDerivedStateOnFunctionComponent = {};
   didWarnAboutFunctionRefs = {};
+  didWarnAboutReassigningProps = false;
 }
 
 function reconcileChildren(
@@ -10862,6 +10862,23 @@ function updateForwardRef(
   nextProps,
   renderExpirationTime
 ) {
+  {
+    if (workInProgress.type !== workInProgress.elementType) {
+      // Lazy component props can't be validated in createElement
+      // because they're only guaranteed to be resolved here.
+      var innerPropTypes = Component.propTypes;
+      if (innerPropTypes) {
+        checkPropTypes(
+          innerPropTypes,
+          nextProps, // Resolved props
+          "prop",
+          getComponentName(Component),
+          getCurrentFiberStackInDev
+        );
+      }
+    }
+  }
+
   var render = Component.render;
   var ref = workInProgress.ref;
 
@@ -10898,12 +10915,20 @@ function updateMemoComponent(
 ) {
   if (current$$1 === null) {
     var type = Component.type;
-    if (isSimpleFunctionComponent(type) && Component.compare === null) {
+    if (
+      isSimpleFunctionComponent(type) &&
+      Component.compare === null &&
+      // SimpleMemoComponent codepath doesn't resolve outer props either.
+      Component.defaultProps === undefined
+    ) {
       // If this is a plain function component without default props,
       // and with only the default shallow comparison, we upgrade it
       // to a SimpleMemoComponent to allow fast path updates.
       workInProgress.tag = SimpleMemoComponent;
       workInProgress.type = type;
+      {
+        validateFunctionComponentInDev(workInProgress, type);
+      }
       return updateSimpleMemoComponent(
         current$$1,
         workInProgress,
@@ -10913,6 +10938,20 @@ function updateMemoComponent(
         renderExpirationTime
       );
     }
+    {
+      var innerPropTypes = type.propTypes;
+      if (innerPropTypes) {
+        // Inner memo component props aren't currently validated in createElement.
+        // We could move it there, but we'd still need this for lazy code path.
+        checkPropTypes(
+          innerPropTypes,
+          nextProps, // Resolved props
+          "prop",
+          getComponentName(type),
+          getCurrentFiberStackInDev
+        );
+      }
+    }
     var child = createFiberFromTypeAndProps(
       Component.type,
       null,
@@ -10926,6 +10965,21 @@ function updateMemoComponent(
     workInProgress.child = child;
     return child;
   }
+  {
+    var _type = Component.type;
+    var _innerPropTypes = _type.propTypes;
+    if (_innerPropTypes) {
+      // Inner memo component props aren't currently validated in createElement.
+      // We could move it there, but we'd still need this for lazy code path.
+      checkPropTypes(
+        _innerPropTypes,
+        nextProps, // Resolved props
+        "prop",
+        getComponentName(_type),
+        getCurrentFiberStackInDev
+      );
+    }
+  }
   var currentChild = current$$1.child; // This is always exactly one child
   if (updateExpirationTime < renderExpirationTime) {
     // This will be the props with resolved defaultProps,
@@ -10966,6 +11020,30 @@ function updateSimpleMemoComponent(
   updateExpirationTime,
   renderExpirationTime
 ) {
+  {
+    if (workInProgress.type !== workInProgress.elementType) {
+      // Lazy component props can't be validated in createElement
+      // because they're only guaranteed to be resolved here.
+      var outerMemoType = workInProgress.elementType;
+      if (outerMemoType.$$typeof === REACT_LAZY_TYPE) {
+        // We warn when you define propTypes on lazy()
+        // so let's just skip over it to find memo() outer wrapper.
+        // Inner props for memo are validated later.
+        outerMemoType = refineResolvedLazyComponent(outerMemoType);
+      }
+      var outerPropTypes = outerMemoType && outerMemoType.propTypes;
+      if (outerPropTypes) {
+        checkPropTypes(
+          outerPropTypes,
+          nextProps, // Resolved (SimpleMemoComponent has no defaultProps)
+          "prop",
+          getComponentName(outerMemoType),
+          getCurrentFiberStackInDev
+        );
+      }
+      // Inner propTypes will be validated in the function component path.
+    }
+  }
   if (current$$1 !== null && updateExpirationTime < renderExpirationTime) {
     var prevProps = current$$1.memoizedProps;
     if (
@@ -11043,6 +11121,23 @@ function updateFunctionComponent(
   nextProps,
   renderExpirationTime
 ) {
+  {
+    if (workInProgress.type !== workInProgress.elementType) {
+      // Lazy component props can't be validated in createElement
+      // because they're only guaranteed to be resolved here.
+      var innerPropTypes = Component.propTypes;
+      if (innerPropTypes) {
+        checkPropTypes(
+          innerPropTypes,
+          nextProps, // Resolved props
+          "prop",
+          getComponentName(Component),
+          getCurrentFiberStackInDev
+        );
+      }
+    }
+  }
+
   var unmaskedContext = getUnmaskedContext(workInProgress, Component, true);
   var context = getMaskedContext(workInProgress, unmaskedContext);
 
@@ -11075,6 +11170,23 @@ function updateClassComponent(
   nextProps,
   renderExpirationTime
 ) {
+  {
+    if (workInProgress.type !== workInProgress.elementType) {
+      // Lazy component props can't be validated in createElement
+      // because they're only guaranteed to be resolved here.
+      var innerPropTypes = Component.propTypes;
+      if (innerPropTypes) {
+        checkPropTypes(
+          innerPropTypes,
+          nextProps, // Resolved props
+          "prop",
+          getComponentName(Component),
+          getCurrentFiberStackInDev
+        );
+      }
+    }
+  }
+
   // Push context providers early to prevent context stack mismatches.
   // During mounting we don't know the child context yet as the instance doesn't exist.
   // We will invalidate the child context in finishClassComponent() right after rendering.
@@ -11131,7 +11243,7 @@ function updateClassComponent(
       renderExpirationTime
     );
   }
-  return finishClassComponent(
+  var nextUnitOfWork = finishClassComponent(
     current$$1,
     workInProgress,
     Component,
@@ -11139,6 +11251,21 @@ function updateClassComponent(
     hasContext,
     renderExpirationTime
   );
+  {
+    var inst = workInProgress.stateNode;
+    if (inst.props !== nextProps) {
+      !didWarnAboutReassigningProps
+        ? warning$1(
+            false,
+            "It looks like %s is reassigning its own `this.props` while rendering. " +
+              "This is not supported and can lead to confusing bugs.",
+            getComponentName(workInProgress.type) || "a component"
+          )
+        : void 0;
+      didWarnAboutReassigningProps = true;
+    }
+  }
+  return nextUnitOfWork;
 }
 
 function finishClassComponent(
@@ -11441,6 +11568,20 @@ function mountLazyComponent(
       break;
     }
     case MemoComponent: {
+      {
+        if (workInProgress.type !== workInProgress.elementType) {
+          var outerPropTypes = Component.propTypes;
+          if (outerPropTypes) {
+            checkPropTypes(
+              outerPropTypes,
+              resolvedProps, // Resolved for outer only
+              "prop",
+              getComponentName(Component),
+              getCurrentFiberStackInDev
+            );
+          }
+        }
+      }
       child = updateMemoComponent(
         null,
         workInProgress,
@@ -11452,14 +11593,25 @@ function mountLazyComponent(
       break;
     }
     default: {
-      // This message intentionally doesn't metion ForwardRef or MemoComponent
+      var hint = "";
+      {
+        if (
+          Component !== null &&
+          typeof Component === "object" &&
+          Component.$$typeof === REACT_LAZY_TYPE
+        ) {
+          hint = " Did you wrap a component in React.lazy() more than once?";
+        }
+      }
+      // This message intentionally doesn't mention ForwardRef or MemoComponent
       // because the fact that it's a separate type of work is an
       // implementation detail.
       invariant(
         false,
         "Element type is invalid. Received a promise that resolves to: %s. " +
-          "Promise elements must resolve to a class or function.",
-        Component
+          "Lazy element type must resolve to a class or function.%s",
+        Component,
+        hint
       );
     }
   }
@@ -11629,70 +11781,74 @@ function mountIndeterminateComponent(
     // Proceed under the assumption that this is a function component
     workInProgress.tag = FunctionComponent;
     value = finishHooks(Component, props, value, context);
+    reconcileChildren(null, workInProgress, value, renderExpirationTime);
     {
-      if (Component) {
-        !!Component.childContextTypes
-          ? warningWithoutStack$1(
-              false,
-              "%s(...): childContextTypes cannot be defined on a function component.",
-              Component.displayName || Component.name || "Component"
-            )
-          : void 0;
-      }
-      if (workInProgress.ref !== null) {
-        var info = "";
-        var ownerName = getCurrentFiberOwnerNameInDevOrNull();
-        if (ownerName) {
-          info += "\n\nCheck the render method of `" + ownerName + "`.";
-        }
+      validateFunctionComponentInDev(workInProgress, Component);
+    }
+    return workInProgress.child;
+  }
+}
 
-        var warningKey = ownerName || workInProgress._debugID || "";
-        var debugSource = workInProgress._debugSource;
-        if (debugSource) {
-          warningKey = debugSource.fileName + ":" + debugSource.lineNumber;
-        }
-        if (!didWarnAboutFunctionRefs[warningKey]) {
-          didWarnAboutFunctionRefs[warningKey] = true;
-          warning$1(
-            false,
-            "Function components cannot be given refs. " +
-              "Attempts to access this ref will fail.%s",
-            info
-          );
-        }
-      }
+function validateFunctionComponentInDev(workInProgress, Component) {
+  if (Component) {
+    !!Component.childContextTypes
+      ? warningWithoutStack$1(
+          false,
+          "%s(...): childContextTypes cannot be defined on a function component.",
+          Component.displayName || Component.name || "Component"
+        )
+      : void 0;
+  }
+  if (workInProgress.ref !== null) {
+    var info = "";
+    var ownerName = getCurrentFiberOwnerNameInDevOrNull();
+    if (ownerName) {
+      info += "\n\nCheck the render method of `" + ownerName + "`.";
+    }
 
-      if (typeof Component.getDerivedStateFromProps === "function") {
-        var _componentName = getComponentName(Component) || "Unknown";
+    var warningKey = ownerName || workInProgress._debugID || "";
+    var debugSource = workInProgress._debugSource;
+    if (debugSource) {
+      warningKey = debugSource.fileName + ":" + debugSource.lineNumber;
+    }
+    if (!didWarnAboutFunctionRefs[warningKey]) {
+      didWarnAboutFunctionRefs[warningKey] = true;
+      warning$1(
+        false,
+        "Function components cannot be given refs. " +
+          "Attempts to access this ref will fail.%s",
+        info
+      );
+    }
+  }
 
-        if (!didWarnAboutGetDerivedStateOnFunctionComponent[_componentName]) {
-          warningWithoutStack$1(
-            false,
-            "%s: Function components do not support getDerivedStateFromProps.",
-            _componentName
-          );
-          didWarnAboutGetDerivedStateOnFunctionComponent[_componentName] = true;
-        }
-      }
+  if (typeof Component.getDerivedStateFromProps === "function") {
+    var componentName = getComponentName(Component) || "Unknown";
 
-      if (
-        typeof Component.contextType === "object" &&
-        Component.contextType !== null
-      ) {
-        var _componentName2 = getComponentName(Component) || "Unknown";
+    if (!didWarnAboutGetDerivedStateOnFunctionComponent[componentName]) {
+      warningWithoutStack$1(
+        false,
+        "%s: Function components do not support getDerivedStateFromProps.",
+        componentName
+      );
+      didWarnAboutGetDerivedStateOnFunctionComponent[componentName] = true;
+    }
+  }
 
-        if (!didWarnAboutContextTypeOnFunctionComponent[_componentName2]) {
-          warningWithoutStack$1(
-            false,
-            "%s: Function components do not support contextType.",
-            _componentName2
-          );
-          didWarnAboutContextTypeOnFunctionComponent[_componentName2] = true;
-        }
-      }
+  if (
+    typeof Component.contextType === "object" &&
+    Component.contextType !== null
+  ) {
+    var _componentName = getComponentName(Component) || "Unknown";
+
+    if (!didWarnAboutContextTypeOnFunctionComponent[_componentName]) {
+      warningWithoutStack$1(
+        false,
+        "%s: Function components do not support contextType.",
+        _componentName
+      );
+      didWarnAboutContextTypeOnFunctionComponent[_componentName] = true;
     }
-    reconcileChildren(null, workInProgress, value, renderExpirationTime);
-    return workInProgress.child;
   }
 }
 
@@ -11817,7 +11973,6 @@ function updateSuspenseComponent(
           currentPrimaryChildFragment.pendingProps,
           NoWork
         );
-        _primaryChildFragment.effectTag |= Placement;
 
         if ((workInProgress.mode & ConcurrentMode) === NoContext) {
           // Outside of concurrent mode, we commit the effects from the
@@ -11851,7 +12006,6 @@ function updateSuspenseComponent(
           _nextFallbackChildren,
           currentFallbackChildFragment.expirationTime
         ));
-        _fallbackChildFragment.effectTag |= Placement;
         child = _primaryChildFragment;
         _primaryChildFragment.childExpirationTime = NoWork;
         // Skip the primary children, and continue working on the
@@ -11881,6 +12035,7 @@ function updateSuspenseComponent(
       }
     } else {
       // The current tree has not already timed out. That means the primary
+      // children are not wrapped in a fragment fiber.
       var _currentPrimaryChild = current$$1.child;
       if (nextDidTimeout) {
         // Timed out. Wrap the children in a fragment fiber to keep them
@@ -11894,10 +12049,12 @@ function updateSuspenseComponent(
           NoWork,
           null
         );
-
-        _primaryChildFragment2.effectTag |= Placement;
         _primaryChildFragment2.child = _currentPrimaryChild;
-        _currentPrimaryChild.return = _primaryChildFragment2;
+
+        // Even though we're creating a new fiber, there are no new children,
+        // because we're reusing an already mounted tree. So we don't need to
+        // schedule a placement.
+        // primaryChildFragment.effectTag |= Placement;
 
         if ((workInProgress.mode & ConcurrentMode) === NoContext) {
           // Outside of concurrent mode, we commit the effects from the
@@ -12353,13 +12510,29 @@ function beginWork(current$$1, workInProgress, renderExpirationTime) {
         renderExpirationTime
       );
     case MemoComponent: {
-      var _type = workInProgress.type;
+      var _type2 = workInProgress.type;
       var _unresolvedProps3 = workInProgress.pendingProps;
-      var _resolvedProps3 = resolveDefaultProps(_type.type, _unresolvedProps3);
+      // Resolve outer props first, then resolve inner props.
+      var _resolvedProps3 = resolveDefaultProps(_type2, _unresolvedProps3);
+      {
+        if (workInProgress.type !== workInProgress.elementType) {
+          var outerPropTypes = _type2.propTypes;
+          if (outerPropTypes) {
+            checkPropTypes(
+              outerPropTypes,
+              _resolvedProps3, // Resolved for outer only
+              "prop",
+              getComponentName(_type2),
+              getCurrentFiberStackInDev
+            );
+          }
+        }
+      }
+      _resolvedProps3 = resolveDefaultProps(_type2.type, _resolvedProps3);
       return updateMemoComponent(
         current$$1,
         workInProgress,
-        _type,
+        _type2,
         _resolvedProps3,
         updateExpirationTime,
         renderExpirationTime
@@ -13006,12 +13179,16 @@ function completeWork(current, workInProgress, renderExpirationTime) {
         // TODO: Would it be better to store the fallback fragment on
         var currentFallbackChild = current.child.sibling;
         if (currentFallbackChild !== null) {
-          reconcileChildFibers(
-            workInProgress,
-            currentFallbackChild,
-            null,
-            renderExpirationTime
-          );
+          // Deletions go at the beginning of the return fiber's effect list
+          var first = workInProgress.firstEffect;
+          if (first !== null) {
+            workInProgress.firstEffect = currentFallbackChild;
+            currentFallbackChild.nextEffect = first;
+          } else {
+            workInProgress.firstEffect = workInProgress.lastEffect = currentFallbackChild;
+            currentFallbackChild.nextEffect = null;
+          }
+          currentFallbackChild.effectTag = Deletion;
         }
       }
 
@@ -13309,21 +13486,30 @@ function commitBeforeMutationLifeCycles(current$$1, finishedWork) {
           // but instead we rely on them being set during last render.
           // TODO: revisit this when we implement resuming.
           {
-            if (finishedWork.type === finishedWork.elementType) {
+            if (
+              finishedWork.type === finishedWork.elementType &&
+              !didWarnAboutReassigningProps
+            ) {
               !(instance.props === finishedWork.memoizedProps)
                 ? warning$1(
                     false,
-                    "Expected instance props to match memoized props before " +
-                      "getSnapshotBeforeUpdate. This is likely due to a bug in React. " +
-                      "Please file an issue."
+                    "Expected %s props to match memoized props before " +
+                      "getSnapshotBeforeUpdate. " +
+                      "This might either be because of a bug in React, or because " +
+                      "a component reassigns its own `this.props`. " +
+                      "Please file an issue.",
+                    getComponentName(finishedWork.type) || "instance"
                   )
                 : void 0;
               !(instance.state === finishedWork.memoizedState)
                 ? warning$1(
                     false,
-                    "Expected instance state to match memoized state before " +
-                      "getSnapshotBeforeUpdate. This is likely due to a bug in React. " +
-                      "Please file an issue."
+                    "Expected %s state to match memoized state before " +
+                      "getSnapshotBeforeUpdate. " +
+                      "This might either be because of a bug in React, or because " +
+                      "a component reassigns its own `this.props`. " +
+                      "Please file an issue.",
+                    getComponentName(finishedWork.type) || "instance"
                   )
                 : void 0;
             }
@@ -13399,9 +13585,17 @@ function commitHookEffectList(unmountTag, mountTag, finishedWork) {
                 "useEffect function must return a cleanup function or " +
                   "nothing.%s%s",
                 typeof _destroy.then === "function"
-                  ? " Promises and useEffect(async () => ...) are not " +
-                    "supported, but you can call an async function inside an " +
-                    "effect."
+                  ? "\n\nIt looks like you wrote useEffect(async () => ...) or returned a Promise. " +
+                    "Instead, you may write an async function separately " +
+                    "and then call it from inside the effect:\n\n" +
+                    "async function fetchComment(commentId) {\n" +
+                    "  // You can await here\n" +
+                    "}\n\n" +
+                    "useEffect(() => {\n" +
+                    "  fetchComment(commentId);\n" +
+                    "}, [commentId]);\n\n" +
+                    "In the future, React will provide a more idiomatic solution for data fetching " +
+                    "that doesn't involve writing effects manually."
                   : "",
                 getStackByFiberInDevAndProd(finishedWork)
               );
@@ -13443,21 +13637,30 @@ function commitLifeCycles(
           // but instead we rely on them being set during last render.
           // TODO: revisit this when we implement resuming.
           {
-            if (finishedWork.type === finishedWork.elementType) {
+            if (
+              finishedWork.type === finishedWork.elementType &&
+              !didWarnAboutReassigningProps
+            ) {
               !(instance.props === finishedWork.memoizedProps)
                 ? warning$1(
                     false,
-                    "Expected instance props to match memoized props before " +
-                      "componentDidMount. This is likely due to a bug in React. " +
-                      "Please file an issue."
+                    "Expected %s props to match memoized props before " +
+                      "componentDidMount. " +
+                      "This might either be because of a bug in React, or because " +
+                      "a component reassigns its own `this.props`. " +
+                      "Please file an issue.",
+                    getComponentName(finishedWork.type) || "instance"
                   )
                 : void 0;
               !(instance.state === finishedWork.memoizedState)
                 ? warning$1(
                     false,
-                    "Expected instance state to match memoized state before " +
-                      "componentDidMount. This is likely due to a bug in React. " +
-                      "Please file an issue."
+                    "Expected %s state to match memoized state before " +
+                      "componentDidMount. " +
+                      "This might either be because of a bug in React, or because " +
+                      "a component reassigns its own `this.props`. " +
+                      "Please file an issue.",
+                    getComponentName(finishedWork.type) || "instance"
                   )
                 : void 0;
             }
@@ -13478,21 +13681,30 @@ function commitLifeCycles(
           // but instead we rely on them being set during last render.
           // TODO: revisit this when we implement resuming.
           {
-            if (finishedWork.type === finishedWork.elementType) {
+            if (
+              finishedWork.type === finishedWork.elementType &&
+              !didWarnAboutReassigningProps
+            ) {
               !(instance.props === finishedWork.memoizedProps)
                 ? warning$1(
                     false,
-                    "Expected instance props to match memoized props before " +
-                      "componentDidUpdate. This is likely due to a bug in React. " +
-                      "Please file an issue."
+                    "Expected %s props to match memoized props before " +
+                      "componentDidUpdate. " +
+                      "This might either be because of a bug in React, or because " +
+                      "a component reassigns its own `this.props`. " +
+                      "Please file an issue.",
+                    getComponentName(finishedWork.type) || "instance"
                   )
                 : void 0;
               !(instance.state === finishedWork.memoizedState)
                 ? warning$1(
                     false,
-                    "Expected instance state to match memoized state before " +
-                      "componentDidUpdate. This is likely due to a bug in React. " +
-                      "Please file an issue."
+                    "Expected %s state to match memoized state before " +
+                      "componentDidUpdate. " +
+                      "This might either be because of a bug in React, or because " +
+                      "a component reassigns its own `this.props`. " +
+                      "Please file an issue.",
+                    getComponentName(finishedWork.type) || "instance"
                   )
                 : void 0;
             }
@@ -13508,21 +13720,30 @@ function commitLifeCycles(
       var updateQueue = finishedWork.updateQueue;
       if (updateQueue !== null) {
         {
-          if (finishedWork.type === finishedWork.elementType) {
+          if (
+            finishedWork.type === finishedWork.elementType &&
+            !didWarnAboutReassigningProps
+          ) {
             !(instance.props === finishedWork.memoizedProps)
               ? warning$1(
                   false,
-                  "Expected instance props to match memoized props before " +
-                    "processing the update queue. This is likely due to a bug in React. " +
-                    "Please file an issue."
+                  "Expected %s props to match memoized props before " +
+                    "processing the update queue. " +
+                    "This might either be because of a bug in React, or because " +
+                    "a component reassigns its own `this.props`. " +
+                    "Please file an issue.",
+                  getComponentName(finishedWork.type) || "instance"
                 )
               : void 0;
             !(instance.state === finishedWork.memoizedState)
               ? warning$1(
                   false,
-                  "Expected instance state to match memoized state before " +
-                    "processing the update queue. This is likely due to a bug in React. " +
-                    "Please file an issue."
+                  "Expected %s state to match memoized state before " +
+                    "processing the update queue. " +
+                    "This might either be because of a bug in React, or because " +
+                    "a component reassigns its own `this.props`. " +
+                    "Please file an issue.",
+                  getComponentName(finishedWork.type) || "instance"
                 )
               : void 0;
           }
@@ -13645,6 +13866,15 @@ function hideOrUnhideAllChildren(finishedWork, isHidden) {
         } else {
           unhideTextInstance(_instance3, node.memoizedProps);
         }
+      } else if (
+        node.tag === SuspenseComponent &&
+        node.memoizedState !== null
+      ) {
+        // Found a nested Suspense component that timed out. Skip over the
+        var fallbackChildFragment = node.child.sibling;
+        fallbackChildFragment.return = node;
+        node = fallbackChildFragment;
+        continue;
       } else if (node.child !== null) {
         node.child.return = node;
         node = node.child;
@@ -13804,9 +14034,14 @@ function detachFiber(current$$1) {
   // itself will be GC:ed when the parent updates the next time.
   current$$1.return = null;
   current$$1.child = null;
-  if (current$$1.alternate) {
-    current$$1.alternate.child = null;
-    current$$1.alternate.return = null;
+  current$$1.memoizedState = null;
+  current$$1.updateQueue = null;
+  var alternate = current$$1.alternate;
+  if (alternate !== null) {
+    alternate.return = null;
+    alternate.child = null;
+    alternate.memoizedState = null;
+    alternate.updateQueue = null;
   }
 }
 
@@ -14107,6 +14342,8 @@ function commitWork(current$$1, finishedWork) {
       case ForwardRef:
       case MemoComponent:
       case SimpleMemoComponent: {
+        // Note: We currently never use MountMutation, but useLayout uses
+        // UnmountMutation.
         commitHookEffectList(UnmountMutation, MountMutation, finishedWork);
         return;
       }
@@ -14121,6 +14358,8 @@ function commitWork(current$$1, finishedWork) {
     case ForwardRef:
     case MemoComponent:
     case SimpleMemoComponent: {
+      // Note: We currently never use MountMutation, but useLayout uses
+      // UnmountMutation.
       commitHookEffectList(UnmountMutation, MountMutation, finishedWork);
       return;
     }
@@ -14378,20 +14617,10 @@ function throwException(
         if ((_workInProgress.mode & ConcurrentMode) === NoEffect) {
           _workInProgress.effectTag |= DidCapture;
 
-          // Unmount the source fiber's children
-          var nextChildren = null;
-          reconcileChildren(
-            sourceFiber.alternate,
-            sourceFiber,
-            nextChildren,
-            renderExpirationTime
-          );
-          sourceFiber.effectTag &= ~Incomplete;
-
           // We're going to commit this fiber even though it didn't complete.
           // But we shouldn't call any lifecycle methods or callbacks. Remove
           // all lifecycle effect tags.
-          sourceFiber.effectTag &= ~LifecycleEffectMask;
+          sourceFiber.effectTag &= ~(LifecycleEffectMask | Incomplete);
 
           if (sourceFiber.tag === ClassComponent) {
             var _current = sourceFiber.alternate;
@@ -14607,7 +14836,6 @@ var Dispatcher = {
   useImperativeMethods: useImperativeMethods,
   useLayoutEffect: useLayoutEffect,
   useMemo: useMemo,
-  useMutationEffect: useMutationEffect,
   useReducer: useReducer,
   useRef: useRef,
   useState: useState
@@ -14625,12 +14853,12 @@ var warnAboutInvalidUpdates = void 0;
 
 if (enableSchedulerTracing) {
   // Provide explicit error message when production+profiling bundle of e.g. react-dom
-  // is used with production (non-profiling) bundle of schedule/tracing
+  // is used with production (non-profiling) bundle of scheduler/tracing
   invariant(
     tracing.__interactionsRef != null &&
       tracing.__interactionsRef.current != null,
     "It is not supported to run the profiling version of a renderer (for example, `react-dom/profiling`) " +
-      "without also replacing the `schedule/tracing` module with `schedule/tracing-profiling`. " +
+      "without also replacing the `scheduler/tracing` module with `scheduler/tracing-profiling`. " +
       "Your bundler might have a setting for aliasing both modules. " +
       "Learn more at http://fb.me/react-profiling"
   );
@@ -16127,6 +16355,46 @@ function scheduleWorkToRoot(fiber, expirationTime) {
     }
   }
 
+  if (enableSchedulerTracing) {
+    if (root !== null) {
+      var interactions = tracing.__interactionsRef.current;
+      if (interactions.size > 0) {
+        var pendingInteractionMap = root.pendingInteractionMap;
+        var pendingInteractions = pendingInteractionMap.get(expirationTime);
+        if (pendingInteractions != null) {
+          interactions.forEach(function(interaction) {
+            if (!pendingInteractions.has(interaction)) {
+              // Update the pending async work count for previously unscheduled interaction.
+              interaction.__count++;
+            }
+
+            pendingInteractions.add(interaction);
+          });
+        } else {
+          pendingInteractionMap.set(expirationTime, new Set(interactions));
+
+          // Update the pending async work count for the current interactions.
+          interactions.forEach(function(interaction) {
+            interaction.__count++;
+          });
+        }
+
+        var subscriber = tracing.__subscriberRef.current;
+        if (subscriber !== null) {
+          var threadID = computeThreadID(
+            expirationTime,
+            root.interactionThreadID
+          );
+          subscriber.onWorkScheduled(interactions, threadID);
+        }
+      }
+    }
+  }
+  return root;
+}
+
+function scheduleWork(fiber, expirationTime) {
+  var root = scheduleWorkToRoot(fiber, expirationTime);
   if (root === null) {
     {
       switch (fiber.tag) {
@@ -16141,49 +16409,6 @@ function scheduleWorkToRoot(fiber, expirationTime) {
           break;
       }
     }
-    return null;
-  }
-
-  if (enableSchedulerTracing) {
-    var interactions = tracing.__interactionsRef.current;
-    if (interactions.size > 0) {
-      var pendingInteractionMap = root.pendingInteractionMap;
-      var pendingInteractions = pendingInteractionMap.get(expirationTime);
-      if (pendingInteractions != null) {
-        interactions.forEach(function(interaction) {
-          if (!pendingInteractions.has(interaction)) {
-            // Update the pending async work count for previously unscheduled interaction.
-            interaction.__count++;
-          }
-
-          pendingInteractions.add(interaction);
-        });
-      } else {
-        pendingInteractionMap.set(expirationTime, new Set(interactions));
-
-        // Update the pending async work count for the current interactions.
-        interactions.forEach(function(interaction) {
-          interaction.__count++;
-        });
-      }
-
-      var subscriber = tracing.__subscriberRef.current;
-      if (subscriber !== null) {
-        var threadID = computeThreadID(
-          expirationTime,
-          root.interactionThreadID
-        );
-        subscriber.onWorkScheduled(interactions, threadID);
-      }
-    }
-  }
-
-  return root;
-}
-
-function scheduleWork(fiber, expirationTime) {
-  var root = scheduleWorkToRoot(fiber, expirationTime);
-  if (root === null) {
     return;
   }
 
@@ -16243,7 +16468,7 @@ var isBatchingInteractiveUpdates = false;
 
 var completedBatches = null;
 
-var originalStartTimeMs = now();
+var originalStartTimeMs = now$$1();
 var currentRendererTime = msToExpirationTime(originalStartTimeMs);
 var currentSchedulerTime = currentRendererTime;
 
@@ -16253,7 +16478,7 @@ var nestedUpdateCount = 0;
 var lastCommittedRootDuringThisBatch = null;
 
 function recomputeCurrentRendererTime() {
-  var currentTimeMs = now() - originalStartTimeMs;
+  var currentTimeMs = now$$1() - originalStartTimeMs;
   currentRendererTime = msToExpirationTime(currentTimeMs);
 }
 
@@ -16267,7 +16492,7 @@ function scheduleCallbackWithExpirationTime(root, expirationTime) {
       if (callbackID !== null) {
         // Existing callback has insufficient timeout. Cancel and schedule a
         // new one.
-        cancelDeferredCallback(callbackID);
+        cancelDeferredCallback$$1(callbackID);
       }
     }
     // The request callback timer is already running. Don't start a new one.
@@ -16276,10 +16501,12 @@ function scheduleCallbackWithExpirationTime(root, expirationTime) {
   }
 
   callbackExpirationTime = expirationTime;
-  var currentMs = now() - originalStartTimeMs;
+  var currentMs = now$$1() - originalStartTimeMs;
   var expirationTimeMs = expirationTimeToMs(expirationTime);
   var timeout = expirationTimeMs - currentMs;
-  callbackID = scheduleDeferredCallback(performAsyncWork, { timeout: timeout });
+  callbackID = scheduleDeferredCallback$$1(performAsyncWork, {
+    timeout: timeout
+  });
 }
 
 // For every call to renderRoot, one of onFatal, onComplete, onSuspend, and
@@ -16508,7 +16735,7 @@ function shouldYieldToRenderer() {
   if (didYield) {
     return true;
   }
-  if (shouldYield()) {
+  if (shouldYield$$1()) {
     didYield = true;
     return true;
   }
@@ -16930,7 +17157,7 @@ function updateContainerAtExpirationTime(
   return scheduleRootUpdate(current$$1, element, expirationTime, callback);
 }
 
-function findHostInstance$1(component) {
+function findHostInstance(component) {
   var fiber = get$1(component);
   if (fiber === undefined) {
     if (typeof component.render === "function") {
@@ -16950,7 +17177,7 @@ function findHostInstance$1(component) {
   return hostFiber.stateNode;
 }
 
-function findHostInstanceWithWarning$1(component, methodName) {
+function findHostInstanceWithWarning(component, methodName) {
   {
     var fiber = get$1(component);
     if (fiber === undefined) {
@@ -17005,7 +17232,7 @@ function findHostInstanceWithWarning$1(component, methodName) {
     }
     return hostFiber.stateNode;
   }
-  return findHostInstance$1(component);
+  return findHostInstance(component);
 }
 
 function createContainer(containerInfo, isConcurrent, hydrate) {
@@ -17594,8 +17821,6 @@ var getInspectorDataForViewTag = void 0;
 }
 
 var ReactCurrentOwner = ReactSharedInternals.ReactCurrentOwner;
-var findHostInstance = findHostInstance$1;
-var findHostInstanceWithWarning = findHostInstanceWithWarning$1;
 
 function findNodeHandle(componentOrHandle) {
   {
diff --git a/Libraries/Renderer/oss/ReactFabric-prod.js b/Libraries/Renderer/oss/ReactFabric-prod.js
index cc9b81203f0a70..95eeffce359f83 100644
--- a/Libraries/Renderer/oss/ReactFabric-prod.js
+++ b/Libraries/Renderer/oss/ReactFabric-prod.js
@@ -956,10 +956,6 @@ var eventTypes$1 = {
       }
     }
   },
-  customBubblingEventTypes$1 =
-    ReactNativeViewConfigRegistry.customBubblingEventTypes,
-  customDirectEventTypes$1 =
-    ReactNativeViewConfigRegistry.customDirectEventTypes,
   ReactNativeBridgeEventPlugin = {
     eventTypes: ReactNativeViewConfigRegistry.eventTypes,
     extractEvents: function(
@@ -969,8 +965,10 @@ var eventTypes$1 = {
       nativeEventTarget
     ) {
       if (null == targetInst) return null;
-      var bubbleDispatchConfig = customBubblingEventTypes$1[topLevelType],
-        directDispatchConfig = customDirectEventTypes$1[topLevelType];
+      var bubbleDispatchConfig =
+          ReactNativeViewConfigRegistry.customBubblingEventTypes[topLevelType],
+        directDispatchConfig =
+          ReactNativeViewConfigRegistry.customDirectEventTypes[topLevelType];
       invariant(
         bubbleDispatchConfig || directDispatchConfig,
         'Unsupported top level event type "%s" dispatched',
@@ -1505,7 +1503,7 @@ function dispatchEvent(target, topLevelType, nativeEvent) {
 function shim$1() {
   invariant(
     !1,
-    "The current renderer does not support hyration. This error is likely caused by a bug in React. Please file an issue."
+    "The current renderer does not support hydration. This error is likely caused by a bug in React. Please file an issue."
   );
 }
 var nextReactTag = 2;
@@ -1619,17 +1617,19 @@ function getStackByFiberInDevAndProd(workInProgress) {
   var info = "";
   do {
     a: switch (workInProgress.tag) {
-      case 2:
-      case 16:
-      case 0:
-      case 1:
-      case 5:
-      case 8:
-      case 13:
+      case 3:
+      case 4:
+      case 6:
+      case 7:
+      case 10:
+      case 9:
+        var JSCompiler_inline_result = "";
+        break a;
+      default:
         var owner = workInProgress._debugOwner,
           source = workInProgress._debugSource,
           name = getComponentName(workInProgress.type);
-        var JSCompiler_inline_result = null;
+        JSCompiler_inline_result = null;
         owner && (JSCompiler_inline_result = getComponentName(owner.type));
         owner = name;
         name = "";
@@ -1643,9 +1643,6 @@ function getStackByFiberInDevAndProd(workInProgress) {
           : JSCompiler_inline_result &&
             (name = " (created by " + JSCompiler_inline_result + ")");
         JSCompiler_inline_result = "\n    in " + (owner || "Unknown") + name;
-        break a;
-      default:
-        JSCompiler_inline_result = "";
     }
     info += JSCompiler_inline_result;
     workInProgress = workInProgress.return;
@@ -3379,7 +3376,8 @@ function updateMemoComponent(
       "function" === typeof type &&
       !shouldConstruct(type) &&
       void 0 === type.defaultProps &&
-      null === Component.compare
+      null === Component.compare &&
+      void 0 === Component.defaultProps
     )
       return (
         (workInProgress.tag = 15),
@@ -3817,7 +3815,6 @@ function updateSuspenseComponent(
         nextDidTimeout
           ? ((renderExpirationTime = nextProps.fallback),
             (nextProps = createWorkInProgress(mode, mode.pendingProps, 0)),
-            (nextProps.effectTag |= 2),
             0 === (workInProgress.mode & 1) &&
               ((nextDidTimeout =
                 null !== workInProgress.memoizedState
@@ -3830,7 +3827,6 @@ function updateSuspenseComponent(
               renderExpirationTime,
               current$$1.expirationTime
             )),
-            (mode.effectTag |= 2),
             (renderExpirationTime = nextProps),
             (nextProps.childExpirationTime = 0),
             (renderExpirationTime.return = mode.return = workInProgress))
@@ -3844,9 +3840,7 @@ function updateSuspenseComponent(
         nextDidTimeout
           ? ((nextDidTimeout = nextProps.fallback),
             (nextProps = createFiberFromFragment(null, mode, 0, null)),
-            (nextProps.effectTag |= 2),
             (nextProps.child = current$$1),
-            (current$$1.return = nextProps),
             0 === (workInProgress.mode & 1) &&
               (nextProps.child =
                 null !== workInProgress.memoizedState
@@ -4082,8 +4076,9 @@ function beginWork(current$$1, workInProgress, renderExpirationTime) {
         default:
           invariant(
             !1,
-            "Element type is invalid. Received a promise that resolves to: %s. Promise elements must resolve to a class or function.",
-            current$$1
+            "Element type is invalid. Received a promise that resolves to: %s. Lazy element type must resolve to a class or function.%s",
+            current$$1,
+            ""
           );
       }
       return getDerivedStateFromProps;
@@ -4390,9 +4385,10 @@ function beginWork(current$$1, workInProgress, renderExpirationTime) {
       return (
         (context = workInProgress.type),
         (hasContext = resolveDefaultProps(
-          context.type,
+          context,
           workInProgress.pendingProps
         )),
+        (hasContext = resolveDefaultProps(context.type, hasContext)),
         updateMemoComponent(
           current$$1,
           workInProgress,
@@ -4979,20 +4975,22 @@ function completeUnitOfWork(workInProgress) {
               break a;
             }
             instance = null !== instance;
-            viewConfig = null !== current && null !== current.memoizedState;
+            renderExpirationTime =
+              null !== current && null !== current.memoizedState;
             null !== current &&
               !instance &&
-              viewConfig &&
+              renderExpirationTime &&
               ((current = current.child.sibling),
               null !== current &&
-                reconcileChildFibers(
-                  current$$1,
-                  current,
-                  null,
-                  renderExpirationTime
-                ));
+                ((viewConfig = current$$1.firstEffect),
+                null !== viewConfig
+                  ? ((current$$1.firstEffect = current),
+                    (current.nextEffect = viewConfig))
+                  : ((current$$1.firstEffect = current$$1.lastEffect = current),
+                    (current.nextEffect = null)),
+                (current.effectTag = 8)));
             if (
-              instance !== viewConfig ||
+              instance !== renderExpirationTime ||
               (0 === (current$$1.effectTag & 1) && instance)
             )
               current$$1.effectTag |= 4;
@@ -5183,14 +5181,7 @@ function renderRoot(root$jscomp$0, isYieldy) {
                   thenable.then(returnFiber$jscomp$0, returnFiber$jscomp$0);
                   if (0 === (value.mode & 1)) {
                     value.effectTag |= 64;
-                    reconcileChildren(
-                      sourceFiber$jscomp$0.alternate,
-                      sourceFiber$jscomp$0,
-                      null,
-                      returnFiber
-                    );
-                    sourceFiber$jscomp$0.effectTag &= -1025;
-                    sourceFiber$jscomp$0.effectTag &= -933;
+                    sourceFiber$jscomp$0.effectTag &= -1957;
                     1 === sourceFiber$jscomp$0.tag &&
                       null === sourceFiber$jscomp$0.alternate &&
                       (sourceFiber$jscomp$0.tag = 17);
@@ -5447,7 +5438,7 @@ function scheduleWorkToRoot(fiber, expirationTime) {
       }
       node = node.return;
     }
-  return null === root ? null : root;
+  return root;
 }
 function scheduleWork(fiber, expirationTime) {
   fiber = scheduleWorkToRoot(fiber, expirationTime);
@@ -5944,9 +5935,14 @@ function completeRoot$1(root, finishedWork$jscomp$0, expirationTime) {
             }
             prevState.return = null;
             prevState.child = null;
-            prevState.alternate &&
-              ((prevState.alternate.child = null),
-              (prevState.alternate.return = null));
+            prevState.memoizedState = null;
+            prevState.updateQueue = null;
+            var alternate = prevState.alternate;
+            null !== alternate &&
+              ((alternate.return = null),
+              (alternate.child = null),
+              (alternate.memoizedState = null),
+              (alternate.updateQueue = null));
         }
         nextEffect = nextEffect.nextEffect;
       }
@@ -6101,7 +6097,7 @@ function onUncaughtError(error) {
   nextFlushedRoot.expirationTime = 0;
   hasUnhandledError || ((hasUnhandledError = !0), (unhandledError = error));
 }
-function findHostInstance$1(component) {
+function findHostInstance(component) {
   var fiber = component._reactInternalFiber;
   void 0 === fiber &&
     ("function" === typeof component.render
@@ -6214,7 +6210,7 @@ function findNodeHandle(componentOrHandle) {
   if (componentOrHandle._nativeTag) return componentOrHandle._nativeTag;
   if (componentOrHandle.canonical && componentOrHandle.canonical._nativeTag)
     return componentOrHandle.canonical._nativeTag;
-  componentOrHandle = findHostInstance$1(componentOrHandle);
+  componentOrHandle = findHostInstance(componentOrHandle);
   return null == componentOrHandle
     ? componentOrHandle
     : componentOrHandle.canonical
@@ -6310,7 +6306,7 @@ var roots = new Map(),
         };
         return ReactNativeComponent;
       })(React.Component);
-    })(findNodeHandle, findHostInstance$1),
+    })(findNodeHandle, findHostInstance),
     findNodeHandle: findNodeHandle,
     render: function(element, containerTag, callback) {
       var root = roots.get(containerTag);
@@ -6418,7 +6414,7 @@ var roots = new Map(),
             TextInputState.blurTextInput(findNodeHandle(this));
           }
         };
-      })(findNodeHandle, findHostInstance$1)
+      })(findNodeHandle, findHostInstance)
     }
   };
 (function(devToolsConfig) {
diff --git a/Libraries/Renderer/oss/ReactFabric-profiling.js b/Libraries/Renderer/oss/ReactFabric-profiling.js
index 8f3f835d7c0a10..f327de43d86241 100644
--- a/Libraries/Renderer/oss/ReactFabric-profiling.js
+++ b/Libraries/Renderer/oss/ReactFabric-profiling.js
@@ -957,10 +957,6 @@ var eventTypes$1 = {
       }
     }
   },
-  customBubblingEventTypes$1 =
-    ReactNativeViewConfigRegistry.customBubblingEventTypes,
-  customDirectEventTypes$1 =
-    ReactNativeViewConfigRegistry.customDirectEventTypes,
   ReactNativeBridgeEventPlugin = {
     eventTypes: ReactNativeViewConfigRegistry.eventTypes,
     extractEvents: function(
@@ -970,8 +966,10 @@ var eventTypes$1 = {
       nativeEventTarget
     ) {
       if (null == targetInst) return null;
-      var bubbleDispatchConfig = customBubblingEventTypes$1[topLevelType],
-        directDispatchConfig = customDirectEventTypes$1[topLevelType];
+      var bubbleDispatchConfig =
+          ReactNativeViewConfigRegistry.customBubblingEventTypes[topLevelType],
+        directDispatchConfig =
+          ReactNativeViewConfigRegistry.customDirectEventTypes[topLevelType];
       invariant(
         bubbleDispatchConfig || directDispatchConfig,
         'Unsupported top level event type "%s" dispatched',
@@ -1506,7 +1504,7 @@ function dispatchEvent(target, topLevelType, nativeEvent) {
 function shim$1() {
   invariant(
     !1,
-    "The current renderer does not support hyration. This error is likely caused by a bug in React. Please file an issue."
+    "The current renderer does not support hydration. This error is likely caused by a bug in React. Please file an issue."
   );
 }
 var nextReactTag = 2;
@@ -1620,17 +1618,19 @@ function getStackByFiberInDevAndProd(workInProgress) {
   var info = "";
   do {
     a: switch (workInProgress.tag) {
-      case 2:
-      case 16:
-      case 0:
-      case 1:
-      case 5:
-      case 8:
-      case 13:
+      case 3:
+      case 4:
+      case 6:
+      case 7:
+      case 10:
+      case 9:
+        var JSCompiler_inline_result = "";
+        break a;
+      default:
         var owner = workInProgress._debugOwner,
           source = workInProgress._debugSource,
           name = getComponentName(workInProgress.type);
-        var JSCompiler_inline_result = null;
+        JSCompiler_inline_result = null;
         owner && (JSCompiler_inline_result = getComponentName(owner.type));
         owner = name;
         name = "";
@@ -1644,9 +1644,6 @@ function getStackByFiberInDevAndProd(workInProgress) {
           : JSCompiler_inline_result &&
             (name = " (created by " + JSCompiler_inline_result + ")");
         JSCompiler_inline_result = "\n    in " + (owner || "Unknown") + name;
-        break a;
-      default:
-        JSCompiler_inline_result = "";
     }
     info += JSCompiler_inline_result;
     workInProgress = workInProgress.return;
@@ -3437,7 +3434,8 @@ function updateMemoComponent(
       "function" === typeof type &&
       !shouldConstruct(type) &&
       void 0 === type.defaultProps &&
-      null === Component.compare
+      null === Component.compare &&
+      void 0 === Component.defaultProps
     )
       return (
         (workInProgress.tag = 15),
@@ -3885,7 +3883,6 @@ function updateSuspenseComponent(
         current$$1.pendingProps,
         0
       );
-      renderExpirationTime.effectTag |= 2;
       0 === (workInProgress.mode & 1) &&
         ((nextDidTimeout =
           null !== workInProgress.memoizedState
@@ -3905,7 +3902,6 @@ function updateSuspenseComponent(
         nextProps,
         mode.expirationTime
       );
-      nextProps.effectTag |= 2;
       mode = renderExpirationTime;
       renderExpirationTime.childExpirationTime = 0;
       renderExpirationTime = nextProps;
@@ -3920,9 +3916,7 @@ function updateSuspenseComponent(
   else if (((current$$1 = current$$1.child), nextDidTimeout)) {
     nextDidTimeout = nextProps.fallback;
     nextProps = createFiberFromFragment(null, mode, 0, null);
-    nextProps.effectTag |= 2;
     nextProps.child = current$$1;
-    current$$1.return = nextProps;
     0 === (workInProgress.mode & 1) &&
       (nextProps.child =
         null !== workInProgress.memoizedState
@@ -4170,8 +4164,9 @@ function beginWork(current$$1, workInProgress, renderExpirationTime) {
         default:
           invariant(
             !1,
-            "Element type is invalid. Received a promise that resolves to: %s. Promise elements must resolve to a class or function.",
-            current$$1
+            "Element type is invalid. Received a promise that resolves to: %s. Lazy element type must resolve to a class or function.%s",
+            current$$1,
+            ""
           );
       }
       return getDerivedStateFromProps;
@@ -4479,9 +4474,10 @@ function beginWork(current$$1, workInProgress, renderExpirationTime) {
       return (
         (context = workInProgress.type),
         (hasContext = resolveDefaultProps(
-          context.type,
+          context,
           workInProgress.pendingProps
         )),
+        (hasContext = resolveDefaultProps(context.type, hasContext)),
         updateMemoComponent(
           current$$1,
           workInProgress,
@@ -4906,14 +4902,7 @@ function throwException(
         thenable.then(returnFiber, returnFiber);
         if (0 === (value.mode & 1)) {
           value.effectTag |= 64;
-          reconcileChildren(
-            sourceFiber.alternate,
-            sourceFiber,
-            null,
-            renderExpirationTime
-          );
-          sourceFiber.effectTag &= -1025;
-          sourceFiber.effectTag &= -933;
+          sourceFiber.effectTag &= -1957;
           1 === sourceFiber.tag &&
             null === sourceFiber.alternate &&
             (sourceFiber.tag = 17);
@@ -5033,7 +5022,7 @@ var DispatcherWithoutHooks = { readContext: readContext },
 invariant(
   null != tracing.__interactionsRef &&
     null != tracing.__interactionsRef.current,
-  "It is not supported to run the profiling version of a renderer (for example, `react-dom/profiling`) without also replacing the `schedule/tracing` module with `schedule/tracing-profiling`. Your bundler might have a setting for aliasing both modules. Learn more at http://fb.me/react-profiling"
+  "It is not supported to run the profiling version of a renderer (for example, `react-dom/profiling`) without also replacing the `scheduler/tracing` module with `scheduler/tracing-profiling`. Your bundler might have a setting for aliasing both modules. Learn more at http://fb.me/react-profiling"
 );
 var isWorking = !1,
   nextUnitOfWork = null,
@@ -5171,9 +5160,14 @@ function commitAllHostEffects() {
         }
         effectTag.return = null;
         effectTag.child = null;
-        effectTag.alternate &&
-          ((effectTag.alternate.child = null),
-          (effectTag.alternate.return = null));
+        effectTag.memoizedState = null;
+        effectTag.updateQueue = null;
+        effectTag = effectTag.alternate;
+        null !== effectTag &&
+          ((effectTag.return = null),
+          (effectTag.child = null),
+          (effectTag.memoizedState = null),
+          (effectTag.updateQueue = null));
     }
     nextEffect = nextEffect.nextEffect;
   }
@@ -5586,20 +5580,22 @@ function completeUnitOfWork(workInProgress) {
               break a;
             }
             fiber = null !== fiber;
-            viewConfig = null !== current && null !== current.memoizedState;
+            renderExpirationTime =
+              null !== current && null !== current.memoizedState;
             null !== current &&
               !fiber &&
-              viewConfig &&
+              renderExpirationTime &&
               ((current = current.child.sibling),
               null !== current &&
-                reconcileChildFibers(
-                  current$$1,
-                  current,
-                  null,
-                  renderExpirationTime
-                ));
+                ((viewConfig = current$$1.firstEffect),
+                null !== viewConfig
+                  ? ((current$$1.firstEffect = current),
+                    (current.nextEffect = viewConfig))
+                  : ((current$$1.firstEffect = current$$1.lastEffect = current),
+                    (current.nextEffect = null)),
+                (current.effectTag = 8)));
             if (
-              fiber !== viewConfig ||
+              fiber !== renderExpirationTime ||
               (0 === (current$$1.effectTag & 1) && fiber)
             )
               current$$1.effectTag |= 4;
@@ -5959,9 +5955,10 @@ function scheduleWorkToRoot(fiber, expirationTime) {
       }
       node = node.return;
     }
-  if (null === root) return null;
-  fiber = tracing.__interactionsRef.current;
-  if (0 < fiber.size) {
+  if (
+    null !== root &&
+    ((fiber = tracing.__interactionsRef.current), 0 < fiber.size)
+  ) {
     alternate = root.pendingInteractionMap;
     var pendingInteractions = alternate.get(expirationTime);
     null != pendingInteractions
@@ -6290,7 +6287,7 @@ function onUncaughtError(error) {
   nextFlushedRoot.expirationTime = 0;
   hasUnhandledError || ((hasUnhandledError = !0), (unhandledError = error));
 }
-function findHostInstance$1(component) {
+function findHostInstance(component) {
   var fiber = component._reactInternalFiber;
   void 0 === fiber &&
     ("function" === typeof component.render
@@ -6403,7 +6400,7 @@ function findNodeHandle(componentOrHandle) {
   if (componentOrHandle._nativeTag) return componentOrHandle._nativeTag;
   if (componentOrHandle.canonical && componentOrHandle.canonical._nativeTag)
     return componentOrHandle.canonical._nativeTag;
-  componentOrHandle = findHostInstance$1(componentOrHandle);
+  componentOrHandle = findHostInstance(componentOrHandle);
   return null == componentOrHandle
     ? componentOrHandle
     : componentOrHandle.canonical
@@ -6499,7 +6496,7 @@ var roots = new Map(),
         };
         return ReactNativeComponent;
       })(React.Component);
-    })(findNodeHandle, findHostInstance$1),
+    })(findNodeHandle, findHostInstance),
     findNodeHandle: findNodeHandle,
     render: function(element, containerTag, callback) {
       var root = roots.get(containerTag);
@@ -6612,7 +6609,7 @@ var roots = new Map(),
             TextInputState.blurTextInput(findNodeHandle(this));
           }
         };
-      })(findNodeHandle, findHostInstance$1)
+      })(findNodeHandle, findHostInstance)
     }
   };
 (function(devToolsConfig) {
diff --git a/Libraries/Renderer/oss/ReactNativeRenderer-dev.js b/Libraries/Renderer/oss/ReactNativeRenderer-dev.js
index e2929210ac6f1d..329aabccc5d1ed 100644
--- a/Libraries/Renderer/oss/ReactNativeRenderer-dev.js
+++ b/Libraries/Renderer/oss/ReactNativeRenderer-dev.js
@@ -2441,14 +2441,8 @@ var ResponderEventPlugin = {
   }
 };
 
-var customBubblingEventTypes$1 =
-  ReactNativeViewConfigRegistry.customBubblingEventTypes;
-var customDirectEventTypes$1 =
-  ReactNativeViewConfigRegistry.customDirectEventTypes;
-var eventTypes$2 = ReactNativeViewConfigRegistry.eventTypes;
-
 var ReactNativeBridgeEventPlugin = {
-  eventTypes: eventTypes$2,
+  eventTypes: ReactNativeViewConfigRegistry.eventTypes,
 
   /**
    * @see {EventPluginHub.extractEvents}
@@ -2463,8 +2457,10 @@ var ReactNativeBridgeEventPlugin = {
       // Probably a node belonging to another renderer's tree.
       return null;
     }
-    var bubbleDispatchConfig = customBubblingEventTypes$1[topLevelType];
-    var directDispatchConfig = customDirectEventTypes$1[topLevelType];
+    var bubbleDispatchConfig =
+      ReactNativeViewConfigRegistry.customBubblingEventTypes[topLevelType];
+    var directDispatchConfig =
+      ReactNativeViewConfigRegistry.customDirectEventTypes[topLevelType];
     invariant(
       bubbleDispatchConfig || directDispatchConfig,
       'Unsupported top level event type "%s" dispatched',
@@ -2786,14 +2782,6 @@ function receiveTouches(eventTopLevelType, touches, changedIndices) {
   }
 }
 
-var ReactNativeEventEmitter = Object.freeze({
-  getListener: getListener,
-  registrationNames: registrationNameModules,
-  _receiveRootNodeIDEvent: _receiveRootNodeIDEvent,
-  receiveEvent: receiveEvent,
-  receiveTouches: receiveTouches
-});
-
 // Module provided by RN:
 var ReactNativeGlobalResponderHandler = {
   onChange: function(from, to, blockNativeResponder) {
@@ -2810,7 +2798,10 @@ var ReactNativeGlobalResponderHandler = {
 /**
  * Register the event emitter with the native bridge
  */
-RCTEventEmitter.register(ReactNativeEventEmitter);
+RCTEventEmitter.register({
+  receiveEvent: receiveEvent,
+  receiveTouches: receiveTouches
+});
 
 setComponentTree(
   getFiberCurrentPropsFromNode$1,
@@ -3885,7 +3876,7 @@ var createHiddenTextInstance = shim;
 function shim$1() {
   invariant(
     false,
-    "The current renderer does not support hyration. " +
+    "The current renderer does not support hydration. " +
       "This error is likely caused by a bug in React. " +
       "Please file an issue."
   );
@@ -4082,11 +4073,11 @@ function resetAfterCommit(containerInfo) {
   // Noop
 }
 
-var now = now$1;
+var now$$1 = now$1;
 var isPrimaryRenderer = true;
-var scheduleDeferredCallback = scheduleDeferredCallback$1;
-var cancelDeferredCallback = cancelDeferredCallback$1;
-var shouldYield = shouldYield$1;
+var scheduleDeferredCallback$$1 = scheduleDeferredCallback$1;
+var cancelDeferredCallback$$1 = cancelDeferredCallback$1;
+var shouldYield$$1 = shouldYield$1;
 
 var scheduleTimeout = setTimeout;
 var cancelTimeout = clearTimeout;
@@ -4331,13 +4322,14 @@ var ReactDebugCurrentFrame = ReactSharedInternals.ReactDebugCurrentFrame;
 
 function describeFiber(fiber) {
   switch (fiber.tag) {
-    case IndeterminateComponent:
-    case LazyComponent:
-    case FunctionComponent:
-    case ClassComponent:
-    case HostComponent:
-    case Mode:
-    case SuspenseComponent:
+    case HostRoot:
+    case HostPortal:
+    case HostText:
+    case Fragment:
+    case ContextProvider:
+    case ContextConsumer:
+      return "";
+    default:
       var owner = fiber._debugOwner;
       var source = fiber._debugSource;
       var name = getComponentName(fiber.type);
@@ -4346,8 +4338,6 @@ function describeFiber(fiber) {
         ownerName = getComponentName(owner.type);
       }
       return describeComponentFrame(name, source, ownerName);
-    default:
-      return "";
   }
 }
 
@@ -5434,6 +5424,23 @@ function FiberNode(tag, pendingProps, key, mode) {
   this.alternate = null;
 
   if (enableProfilerTimer) {
+    // Note: The following is done to avoid a v8 deopt.
+    //
+    // It is important to initialize the fields below with doubles.
+    // Otherwise Fibers will deopt and end up having separate shapes when
+    // doubles are later assigned to fields that initially contained smis.
+    // This is a bug in v8 having something to do with Object.preventExtension().
+    //
+    // Learn more about this deopt here:
+    // https://github.com/facebook/react/issues/14365
+    // https://bugs.chromium.org/p/v8/issues/detail?id=8538
+    this.actualDuration = Number.NaN;
+    this.actualStartTime = Number.NaN;
+    this.selfBaseDuration = Number.NaN;
+    this.treeBaseDuration = Number.NaN;
+
+    // It's okay to replace the initial doubles with smis after initialization.
+    // This simplifies other profiler code and doesn't trigger the deopt.
     this.actualDuration = 0;
     this.actualStartTime = -1;
     this.selfBaseDuration = 0;
@@ -7646,7 +7653,7 @@ function cloneHook(hook) {
   return {
     memoizedState: hook.memoizedState,
 
-    baseState: hook.memoizedState,
+    baseState: hook.baseState,
     queue: hook.queue,
     baseUpdate: hook.baseUpdate,
 
@@ -7897,15 +7904,6 @@ function useRef(initialValue) {
   return ref;
 }
 
-function useMutationEffect(create, inputs) {
-  useEffectImpl(
-    Snapshot | Update,
-    UnmountSnapshot | MountMutation,
-    create,
-    inputs
-  );
-}
-
 function useLayoutEffect(create, inputs) {
   useEffectImpl(Update, UnmountMutation | MountLayout, create, inputs);
 }
@@ -7953,28 +7951,23 @@ function useImperativeMethods(ref, create, inputs) {
   // TODO: I've implemented this on top of useEffect because it's almost the
   // same thing, and it would require an equal amount of code. It doesn't seem
   // like a common enough use case to justify the additional size.
-  useEffectImpl(
-    Update,
-    UnmountMutation | MountLayout,
-    function() {
-      if (typeof ref === "function") {
-        var refCallback = ref;
-        var _inst = create();
-        refCallback(_inst);
-        return function() {
-          return refCallback(null);
-        };
-      } else if (ref !== null && ref !== undefined) {
-        var refObject = ref;
-        var _inst2 = create();
-        refObject.current = _inst2;
-        return function() {
-          refObject.current = null;
-        };
-      }
-    },
-    nextInputs
-  );
+  useLayoutEffect(function() {
+    if (typeof ref === "function") {
+      var refCallback = ref;
+      var _inst = create();
+      refCallback(_inst);
+      return function() {
+        return refCallback(null);
+      };
+    } else if (ref !== null && ref !== undefined) {
+      var refObject = ref;
+      var _inst2 = create();
+      refObject.current = _inst2;
+      return function() {
+        refObject.current = null;
+      };
+    }
+  }, nextInputs);
 }
 
 function useCallback(callback, inputs) {
@@ -8166,7 +8159,7 @@ function recordCommitTime() {
   if (!enableProfilerTimer) {
     return;
   }
-  commitTime = now();
+  commitTime = now$$1();
 }
 
 function startProfilerTimer(fiber) {
@@ -8174,10 +8167,10 @@ function startProfilerTimer(fiber) {
     return;
   }
 
-  profilerStartTime = now();
+  profilerStartTime = now$$1();
 
   if (fiber.actualStartTime < 0) {
-    fiber.actualStartTime = now();
+    fiber.actualStartTime = now$$1();
   }
 }
 
@@ -8194,7 +8187,7 @@ function stopProfilerTimerIfRunningAndRecordDelta(fiber, overrideBaseTime) {
   }
 
   if (profilerStartTime >= 0) {
-    var elapsedTime = now() - profilerStartTime;
+    var elapsedTime = now$$1() - profilerStartTime;
     fiber.actualDuration += elapsedTime;
     if (overrideBaseTime) {
       fiber.selfBaseDuration = elapsedTime;
@@ -11078,12 +11071,14 @@ var didWarnAboutBadClass = void 0;
 var didWarnAboutContextTypeOnFunctionComponent = void 0;
 var didWarnAboutGetDerivedStateOnFunctionComponent = void 0;
 var didWarnAboutFunctionRefs = void 0;
+var didWarnAboutReassigningProps = void 0;
 
 {
   didWarnAboutBadClass = {};
   didWarnAboutContextTypeOnFunctionComponent = {};
   didWarnAboutGetDerivedStateOnFunctionComponent = {};
   didWarnAboutFunctionRefs = {};
+  didWarnAboutReassigningProps = false;
 }
 
 function reconcileChildren(
@@ -11158,6 +11153,23 @@ function updateForwardRef(
   nextProps,
   renderExpirationTime
 ) {
+  {
+    if (workInProgress.type !== workInProgress.elementType) {
+      // Lazy component props can't be validated in createElement
+      // because they're only guaranteed to be resolved here.
+      var innerPropTypes = Component.propTypes;
+      if (innerPropTypes) {
+        checkPropTypes(
+          innerPropTypes,
+          nextProps, // Resolved props
+          "prop",
+          getComponentName(Component),
+          getCurrentFiberStackInDev
+        );
+      }
+    }
+  }
+
   var render = Component.render;
   var ref = workInProgress.ref;
 
@@ -11194,12 +11206,20 @@ function updateMemoComponent(
 ) {
   if (current$$1 === null) {
     var type = Component.type;
-    if (isSimpleFunctionComponent(type) && Component.compare === null) {
+    if (
+      isSimpleFunctionComponent(type) &&
+      Component.compare === null &&
+      // SimpleMemoComponent codepath doesn't resolve outer props either.
+      Component.defaultProps === undefined
+    ) {
       // If this is a plain function component without default props,
       // and with only the default shallow comparison, we upgrade it
       // to a SimpleMemoComponent to allow fast path updates.
       workInProgress.tag = SimpleMemoComponent;
       workInProgress.type = type;
+      {
+        validateFunctionComponentInDev(workInProgress, type);
+      }
       return updateSimpleMemoComponent(
         current$$1,
         workInProgress,
@@ -11209,6 +11229,20 @@ function updateMemoComponent(
         renderExpirationTime
       );
     }
+    {
+      var innerPropTypes = type.propTypes;
+      if (innerPropTypes) {
+        // Inner memo component props aren't currently validated in createElement.
+        // We could move it there, but we'd still need this for lazy code path.
+        checkPropTypes(
+          innerPropTypes,
+          nextProps, // Resolved props
+          "prop",
+          getComponentName(type),
+          getCurrentFiberStackInDev
+        );
+      }
+    }
     var child = createFiberFromTypeAndProps(
       Component.type,
       null,
@@ -11222,6 +11256,21 @@ function updateMemoComponent(
     workInProgress.child = child;
     return child;
   }
+  {
+    var _type = Component.type;
+    var _innerPropTypes = _type.propTypes;
+    if (_innerPropTypes) {
+      // Inner memo component props aren't currently validated in createElement.
+      // We could move it there, but we'd still need this for lazy code path.
+      checkPropTypes(
+        _innerPropTypes,
+        nextProps, // Resolved props
+        "prop",
+        getComponentName(_type),
+        getCurrentFiberStackInDev
+      );
+    }
+  }
   var currentChild = current$$1.child; // This is always exactly one child
   if (updateExpirationTime < renderExpirationTime) {
     // This will be the props with resolved defaultProps,
@@ -11262,6 +11311,30 @@ function updateSimpleMemoComponent(
   updateExpirationTime,
   renderExpirationTime
 ) {
+  {
+    if (workInProgress.type !== workInProgress.elementType) {
+      // Lazy component props can't be validated in createElement
+      // because they're only guaranteed to be resolved here.
+      var outerMemoType = workInProgress.elementType;
+      if (outerMemoType.$$typeof === REACT_LAZY_TYPE) {
+        // We warn when you define propTypes on lazy()
+        // so let's just skip over it to find memo() outer wrapper.
+        // Inner props for memo are validated later.
+        outerMemoType = refineResolvedLazyComponent(outerMemoType);
+      }
+      var outerPropTypes = outerMemoType && outerMemoType.propTypes;
+      if (outerPropTypes) {
+        checkPropTypes(
+          outerPropTypes,
+          nextProps, // Resolved (SimpleMemoComponent has no defaultProps)
+          "prop",
+          getComponentName(outerMemoType),
+          getCurrentFiberStackInDev
+        );
+      }
+      // Inner propTypes will be validated in the function component path.
+    }
+  }
   if (current$$1 !== null && updateExpirationTime < renderExpirationTime) {
     var prevProps = current$$1.memoizedProps;
     if (
@@ -11339,6 +11412,23 @@ function updateFunctionComponent(
   nextProps,
   renderExpirationTime
 ) {
+  {
+    if (workInProgress.type !== workInProgress.elementType) {
+      // Lazy component props can't be validated in createElement
+      // because they're only guaranteed to be resolved here.
+      var innerPropTypes = Component.propTypes;
+      if (innerPropTypes) {
+        checkPropTypes(
+          innerPropTypes,
+          nextProps, // Resolved props
+          "prop",
+          getComponentName(Component),
+          getCurrentFiberStackInDev
+        );
+      }
+    }
+  }
+
   var unmaskedContext = getUnmaskedContext(workInProgress, Component, true);
   var context = getMaskedContext(workInProgress, unmaskedContext);
 
@@ -11371,6 +11461,23 @@ function updateClassComponent(
   nextProps,
   renderExpirationTime
 ) {
+  {
+    if (workInProgress.type !== workInProgress.elementType) {
+      // Lazy component props can't be validated in createElement
+      // because they're only guaranteed to be resolved here.
+      var innerPropTypes = Component.propTypes;
+      if (innerPropTypes) {
+        checkPropTypes(
+          innerPropTypes,
+          nextProps, // Resolved props
+          "prop",
+          getComponentName(Component),
+          getCurrentFiberStackInDev
+        );
+      }
+    }
+  }
+
   // Push context providers early to prevent context stack mismatches.
   // During mounting we don't know the child context yet as the instance doesn't exist.
   // We will invalidate the child context in finishClassComponent() right after rendering.
@@ -11427,7 +11534,7 @@ function updateClassComponent(
       renderExpirationTime
     );
   }
-  return finishClassComponent(
+  var nextUnitOfWork = finishClassComponent(
     current$$1,
     workInProgress,
     Component,
@@ -11435,6 +11542,21 @@ function updateClassComponent(
     hasContext,
     renderExpirationTime
   );
+  {
+    var inst = workInProgress.stateNode;
+    if (inst.props !== nextProps) {
+      !didWarnAboutReassigningProps
+        ? warning$1(
+            false,
+            "It looks like %s is reassigning its own `this.props` while rendering. " +
+              "This is not supported and can lead to confusing bugs.",
+            getComponentName(workInProgress.type) || "a component"
+          )
+        : void 0;
+      didWarnAboutReassigningProps = true;
+    }
+  }
+  return nextUnitOfWork;
 }
 
 function finishClassComponent(
@@ -11737,6 +11859,20 @@ function mountLazyComponent(
       break;
     }
     case MemoComponent: {
+      {
+        if (workInProgress.type !== workInProgress.elementType) {
+          var outerPropTypes = Component.propTypes;
+          if (outerPropTypes) {
+            checkPropTypes(
+              outerPropTypes,
+              resolvedProps, // Resolved for outer only
+              "prop",
+              getComponentName(Component),
+              getCurrentFiberStackInDev
+            );
+          }
+        }
+      }
       child = updateMemoComponent(
         null,
         workInProgress,
@@ -11748,14 +11884,25 @@ function mountLazyComponent(
       break;
     }
     default: {
-      // This message intentionally doesn't metion ForwardRef or MemoComponent
+      var hint = "";
+      {
+        if (
+          Component !== null &&
+          typeof Component === "object" &&
+          Component.$$typeof === REACT_LAZY_TYPE
+        ) {
+          hint = " Did you wrap a component in React.lazy() more than once?";
+        }
+      }
+      // This message intentionally doesn't mention ForwardRef or MemoComponent
       // because the fact that it's a separate type of work is an
       // implementation detail.
       invariant(
         false,
         "Element type is invalid. Received a promise that resolves to: %s. " +
-          "Promise elements must resolve to a class or function.",
-        Component
+          "Lazy element type must resolve to a class or function.%s",
+        Component,
+        hint
       );
     }
   }
@@ -11925,70 +12072,74 @@ function mountIndeterminateComponent(
     // Proceed under the assumption that this is a function component
     workInProgress.tag = FunctionComponent;
     value = finishHooks(Component, props, value, context);
+    reconcileChildren(null, workInProgress, value, renderExpirationTime);
     {
-      if (Component) {
-        !!Component.childContextTypes
-          ? warningWithoutStack$1(
-              false,
-              "%s(...): childContextTypes cannot be defined on a function component.",
-              Component.displayName || Component.name || "Component"
-            )
-          : void 0;
-      }
-      if (workInProgress.ref !== null) {
-        var info = "";
-        var ownerName = getCurrentFiberOwnerNameInDevOrNull();
-        if (ownerName) {
-          info += "\n\nCheck the render method of `" + ownerName + "`.";
-        }
+      validateFunctionComponentInDev(workInProgress, Component);
+    }
+    return workInProgress.child;
+  }
+}
 
-        var warningKey = ownerName || workInProgress._debugID || "";
-        var debugSource = workInProgress._debugSource;
-        if (debugSource) {
-          warningKey = debugSource.fileName + ":" + debugSource.lineNumber;
-        }
-        if (!didWarnAboutFunctionRefs[warningKey]) {
-          didWarnAboutFunctionRefs[warningKey] = true;
-          warning$1(
-            false,
-            "Function components cannot be given refs. " +
-              "Attempts to access this ref will fail.%s",
-            info
-          );
-        }
-      }
+function validateFunctionComponentInDev(workInProgress, Component) {
+  if (Component) {
+    !!Component.childContextTypes
+      ? warningWithoutStack$1(
+          false,
+          "%s(...): childContextTypes cannot be defined on a function component.",
+          Component.displayName || Component.name || "Component"
+        )
+      : void 0;
+  }
+  if (workInProgress.ref !== null) {
+    var info = "";
+    var ownerName = getCurrentFiberOwnerNameInDevOrNull();
+    if (ownerName) {
+      info += "\n\nCheck the render method of `" + ownerName + "`.";
+    }
 
-      if (typeof Component.getDerivedStateFromProps === "function") {
-        var _componentName = getComponentName(Component) || "Unknown";
+    var warningKey = ownerName || workInProgress._debugID || "";
+    var debugSource = workInProgress._debugSource;
+    if (debugSource) {
+      warningKey = debugSource.fileName + ":" + debugSource.lineNumber;
+    }
+    if (!didWarnAboutFunctionRefs[warningKey]) {
+      didWarnAboutFunctionRefs[warningKey] = true;
+      warning$1(
+        false,
+        "Function components cannot be given refs. " +
+          "Attempts to access this ref will fail.%s",
+        info
+      );
+    }
+  }
 
-        if (!didWarnAboutGetDerivedStateOnFunctionComponent[_componentName]) {
-          warningWithoutStack$1(
-            false,
-            "%s: Function components do not support getDerivedStateFromProps.",
-            _componentName
-          );
-          didWarnAboutGetDerivedStateOnFunctionComponent[_componentName] = true;
-        }
-      }
+  if (typeof Component.getDerivedStateFromProps === "function") {
+    var componentName = getComponentName(Component) || "Unknown";
 
-      if (
-        typeof Component.contextType === "object" &&
-        Component.contextType !== null
-      ) {
-        var _componentName2 = getComponentName(Component) || "Unknown";
+    if (!didWarnAboutGetDerivedStateOnFunctionComponent[componentName]) {
+      warningWithoutStack$1(
+        false,
+        "%s: Function components do not support getDerivedStateFromProps.",
+        componentName
+      );
+      didWarnAboutGetDerivedStateOnFunctionComponent[componentName] = true;
+    }
+  }
 
-        if (!didWarnAboutContextTypeOnFunctionComponent[_componentName2]) {
-          warningWithoutStack$1(
-            false,
-            "%s: Function components do not support contextType.",
-            _componentName2
-          );
-          didWarnAboutContextTypeOnFunctionComponent[_componentName2] = true;
-        }
-      }
+  if (
+    typeof Component.contextType === "object" &&
+    Component.contextType !== null
+  ) {
+    var _componentName = getComponentName(Component) || "Unknown";
+
+    if (!didWarnAboutContextTypeOnFunctionComponent[_componentName]) {
+      warningWithoutStack$1(
+        false,
+        "%s: Function components do not support contextType.",
+        _componentName
+      );
+      didWarnAboutContextTypeOnFunctionComponent[_componentName] = true;
     }
-    reconcileChildren(null, workInProgress, value, renderExpirationTime);
-    return workInProgress.child;
   }
 }
 
@@ -12113,7 +12264,6 @@ function updateSuspenseComponent(
           currentPrimaryChildFragment.pendingProps,
           NoWork
         );
-        _primaryChildFragment.effectTag |= Placement;
 
         if ((workInProgress.mode & ConcurrentMode) === NoContext) {
           // Outside of concurrent mode, we commit the effects from the
@@ -12147,7 +12297,6 @@ function updateSuspenseComponent(
           _nextFallbackChildren,
           currentFallbackChildFragment.expirationTime
         ));
-        _fallbackChildFragment.effectTag |= Placement;
         child = _primaryChildFragment;
         _primaryChildFragment.childExpirationTime = NoWork;
         // Skip the primary children, and continue working on the
@@ -12177,6 +12326,7 @@ function updateSuspenseComponent(
       }
     } else {
       // The current tree has not already timed out. That means the primary
+      // children are not wrapped in a fragment fiber.
       var _currentPrimaryChild = current$$1.child;
       if (nextDidTimeout) {
         // Timed out. Wrap the children in a fragment fiber to keep them
@@ -12190,10 +12340,12 @@ function updateSuspenseComponent(
           NoWork,
           null
         );
-
-        _primaryChildFragment2.effectTag |= Placement;
         _primaryChildFragment2.child = _currentPrimaryChild;
-        _currentPrimaryChild.return = _primaryChildFragment2;
+
+        // Even though we're creating a new fiber, there are no new children,
+        // because we're reusing an already mounted tree. So we don't need to
+        // schedule a placement.
+        // primaryChildFragment.effectTag |= Placement;
 
         if ((workInProgress.mode & ConcurrentMode) === NoContext) {
           // Outside of concurrent mode, we commit the effects from the
@@ -12649,13 +12801,29 @@ function beginWork(current$$1, workInProgress, renderExpirationTime) {
         renderExpirationTime
       );
     case MemoComponent: {
-      var _type = workInProgress.type;
+      var _type2 = workInProgress.type;
       var _unresolvedProps3 = workInProgress.pendingProps;
-      var _resolvedProps3 = resolveDefaultProps(_type.type, _unresolvedProps3);
+      // Resolve outer props first, then resolve inner props.
+      var _resolvedProps3 = resolveDefaultProps(_type2, _unresolvedProps3);
+      {
+        if (workInProgress.type !== workInProgress.elementType) {
+          var outerPropTypes = _type2.propTypes;
+          if (outerPropTypes) {
+            checkPropTypes(
+              outerPropTypes,
+              _resolvedProps3, // Resolved for outer only
+              "prop",
+              getComponentName(_type2),
+              getCurrentFiberStackInDev
+            );
+          }
+        }
+      }
+      _resolvedProps3 = resolveDefaultProps(_type2.type, _resolvedProps3);
       return updateMemoComponent(
         current$$1,
         workInProgress,
-        _type,
+        _type2,
         _resolvedProps3,
         updateExpirationTime,
         renderExpirationTime
@@ -13302,12 +13470,16 @@ function completeWork(current, workInProgress, renderExpirationTime) {
         // TODO: Would it be better to store the fallback fragment on
         var currentFallbackChild = current.child.sibling;
         if (currentFallbackChild !== null) {
-          reconcileChildFibers(
-            workInProgress,
-            currentFallbackChild,
-            null,
-            renderExpirationTime
-          );
+          // Deletions go at the beginning of the return fiber's effect list
+          var first = workInProgress.firstEffect;
+          if (first !== null) {
+            workInProgress.firstEffect = currentFallbackChild;
+            currentFallbackChild.nextEffect = first;
+          } else {
+            workInProgress.firstEffect = workInProgress.lastEffect = currentFallbackChild;
+            currentFallbackChild.nextEffect = null;
+          }
+          currentFallbackChild.effectTag = Deletion;
         }
       }
 
@@ -13605,21 +13777,30 @@ function commitBeforeMutationLifeCycles(current$$1, finishedWork) {
           // but instead we rely on them being set during last render.
           // TODO: revisit this when we implement resuming.
           {
-            if (finishedWork.type === finishedWork.elementType) {
+            if (
+              finishedWork.type === finishedWork.elementType &&
+              !didWarnAboutReassigningProps
+            ) {
               !(instance.props === finishedWork.memoizedProps)
                 ? warning$1(
                     false,
-                    "Expected instance props to match memoized props before " +
-                      "getSnapshotBeforeUpdate. This is likely due to a bug in React. " +
-                      "Please file an issue."
+                    "Expected %s props to match memoized props before " +
+                      "getSnapshotBeforeUpdate. " +
+                      "This might either be because of a bug in React, or because " +
+                      "a component reassigns its own `this.props`. " +
+                      "Please file an issue.",
+                    getComponentName(finishedWork.type) || "instance"
                   )
                 : void 0;
               !(instance.state === finishedWork.memoizedState)
                 ? warning$1(
                     false,
-                    "Expected instance state to match memoized state before " +
-                      "getSnapshotBeforeUpdate. This is likely due to a bug in React. " +
-                      "Please file an issue."
+                    "Expected %s state to match memoized state before " +
+                      "getSnapshotBeforeUpdate. " +
+                      "This might either be because of a bug in React, or because " +
+                      "a component reassigns its own `this.props`. " +
+                      "Please file an issue.",
+                    getComponentName(finishedWork.type) || "instance"
                   )
                 : void 0;
             }
@@ -13695,9 +13876,17 @@ function commitHookEffectList(unmountTag, mountTag, finishedWork) {
                 "useEffect function must return a cleanup function or " +
                   "nothing.%s%s",
                 typeof _destroy.then === "function"
-                  ? " Promises and useEffect(async () => ...) are not " +
-                    "supported, but you can call an async function inside an " +
-                    "effect."
+                  ? "\n\nIt looks like you wrote useEffect(async () => ...) or returned a Promise. " +
+                    "Instead, you may write an async function separately " +
+                    "and then call it from inside the effect:\n\n" +
+                    "async function fetchComment(commentId) {\n" +
+                    "  // You can await here\n" +
+                    "}\n\n" +
+                    "useEffect(() => {\n" +
+                    "  fetchComment(commentId);\n" +
+                    "}, [commentId]);\n\n" +
+                    "In the future, React will provide a more idiomatic solution for data fetching " +
+                    "that doesn't involve writing effects manually."
                   : "",
                 getStackByFiberInDevAndProd(finishedWork)
               );
@@ -13739,21 +13928,30 @@ function commitLifeCycles(
           // but instead we rely on them being set during last render.
           // TODO: revisit this when we implement resuming.
           {
-            if (finishedWork.type === finishedWork.elementType) {
+            if (
+              finishedWork.type === finishedWork.elementType &&
+              !didWarnAboutReassigningProps
+            ) {
               !(instance.props === finishedWork.memoizedProps)
                 ? warning$1(
                     false,
-                    "Expected instance props to match memoized props before " +
-                      "componentDidMount. This is likely due to a bug in React. " +
-                      "Please file an issue."
+                    "Expected %s props to match memoized props before " +
+                      "componentDidMount. " +
+                      "This might either be because of a bug in React, or because " +
+                      "a component reassigns its own `this.props`. " +
+                      "Please file an issue.",
+                    getComponentName(finishedWork.type) || "instance"
                   )
                 : void 0;
               !(instance.state === finishedWork.memoizedState)
                 ? warning$1(
                     false,
-                    "Expected instance state to match memoized state before " +
-                      "componentDidMount. This is likely due to a bug in React. " +
-                      "Please file an issue."
+                    "Expected %s state to match memoized state before " +
+                      "componentDidMount. " +
+                      "This might either be because of a bug in React, or because " +
+                      "a component reassigns its own `this.props`. " +
+                      "Please file an issue.",
+                    getComponentName(finishedWork.type) || "instance"
                   )
                 : void 0;
             }
@@ -13774,21 +13972,30 @@ function commitLifeCycles(
           // but instead we rely on them being set during last render.
           // TODO: revisit this when we implement resuming.
           {
-            if (finishedWork.type === finishedWork.elementType) {
+            if (
+              finishedWork.type === finishedWork.elementType &&
+              !didWarnAboutReassigningProps
+            ) {
               !(instance.props === finishedWork.memoizedProps)
                 ? warning$1(
                     false,
-                    "Expected instance props to match memoized props before " +
-                      "componentDidUpdate. This is likely due to a bug in React. " +
-                      "Please file an issue."
+                    "Expected %s props to match memoized props before " +
+                      "componentDidUpdate. " +
+                      "This might either be because of a bug in React, or because " +
+                      "a component reassigns its own `this.props`. " +
+                      "Please file an issue.",
+                    getComponentName(finishedWork.type) || "instance"
                   )
                 : void 0;
               !(instance.state === finishedWork.memoizedState)
                 ? warning$1(
                     false,
-                    "Expected instance state to match memoized state before " +
-                      "componentDidUpdate. This is likely due to a bug in React. " +
-                      "Please file an issue."
+                    "Expected %s state to match memoized state before " +
+                      "componentDidUpdate. " +
+                      "This might either be because of a bug in React, or because " +
+                      "a component reassigns its own `this.props`. " +
+                      "Please file an issue.",
+                    getComponentName(finishedWork.type) || "instance"
                   )
                 : void 0;
             }
@@ -13804,21 +14011,30 @@ function commitLifeCycles(
       var updateQueue = finishedWork.updateQueue;
       if (updateQueue !== null) {
         {
-          if (finishedWork.type === finishedWork.elementType) {
+          if (
+            finishedWork.type === finishedWork.elementType &&
+            !didWarnAboutReassigningProps
+          ) {
             !(instance.props === finishedWork.memoizedProps)
               ? warning$1(
                   false,
-                  "Expected instance props to match memoized props before " +
-                    "processing the update queue. This is likely due to a bug in React. " +
-                    "Please file an issue."
+                  "Expected %s props to match memoized props before " +
+                    "processing the update queue. " +
+                    "This might either be because of a bug in React, or because " +
+                    "a component reassigns its own `this.props`. " +
+                    "Please file an issue.",
+                  getComponentName(finishedWork.type) || "instance"
                 )
               : void 0;
             !(instance.state === finishedWork.memoizedState)
               ? warning$1(
                   false,
-                  "Expected instance state to match memoized state before " +
-                    "processing the update queue. This is likely due to a bug in React. " +
-                    "Please file an issue."
+                  "Expected %s state to match memoized state before " +
+                    "processing the update queue. " +
+                    "This might either be because of a bug in React, or because " +
+                    "a component reassigns its own `this.props`. " +
+                    "Please file an issue.",
+                  getComponentName(finishedWork.type) || "instance"
                 )
               : void 0;
           }
@@ -13940,6 +14156,15 @@ function hideOrUnhideAllChildren(finishedWork, isHidden) {
         } else {
           unhideTextInstance(_instance3, node.memoizedProps);
         }
+      } else if (
+        node.tag === SuspenseComponent &&
+        node.memoizedState !== null
+      ) {
+        // Found a nested Suspense component that timed out. Skip over the
+        var fallbackChildFragment = node.child.sibling;
+        fallbackChildFragment.return = node;
+        node = fallbackChildFragment;
+        continue;
       } else if (node.child !== null) {
         node.child.return = node;
         node = node.child;
@@ -14099,9 +14324,14 @@ function detachFiber(current$$1) {
   // itself will be GC:ed when the parent updates the next time.
   current$$1.return = null;
   current$$1.child = null;
-  if (current$$1.alternate) {
-    current$$1.alternate.child = null;
-    current$$1.alternate.return = null;
+  current$$1.memoizedState = null;
+  current$$1.updateQueue = null;
+  var alternate = current$$1.alternate;
+  if (alternate !== null) {
+    alternate.return = null;
+    alternate.child = null;
+    alternate.memoizedState = null;
+    alternate.updateQueue = null;
   }
 }
 
@@ -14402,6 +14632,8 @@ function commitWork(current$$1, finishedWork) {
       case ForwardRef:
       case MemoComponent:
       case SimpleMemoComponent: {
+        // Note: We currently never use MountMutation, but useLayout uses
+        // UnmountMutation.
         commitHookEffectList(UnmountMutation, MountMutation, finishedWork);
         return;
       }
@@ -14416,6 +14648,8 @@ function commitWork(current$$1, finishedWork) {
     case ForwardRef:
     case MemoComponent:
     case SimpleMemoComponent: {
+      // Note: We currently never use MountMutation, but useLayout uses
+      // UnmountMutation.
       commitHookEffectList(UnmountMutation, MountMutation, finishedWork);
       return;
     }
@@ -14673,20 +14907,10 @@ function throwException(
         if ((_workInProgress.mode & ConcurrentMode) === NoEffect) {
           _workInProgress.effectTag |= DidCapture;
 
-          // Unmount the source fiber's children
-          var nextChildren = null;
-          reconcileChildren(
-            sourceFiber.alternate,
-            sourceFiber,
-            nextChildren,
-            renderExpirationTime
-          );
-          sourceFiber.effectTag &= ~Incomplete;
-
           // We're going to commit this fiber even though it didn't complete.
           // But we shouldn't call any lifecycle methods or callbacks. Remove
           // all lifecycle effect tags.
-          sourceFiber.effectTag &= ~LifecycleEffectMask;
+          sourceFiber.effectTag &= ~(LifecycleEffectMask | Incomplete);
 
           if (sourceFiber.tag === ClassComponent) {
             var _current = sourceFiber.alternate;
@@ -14902,7 +15126,6 @@ var Dispatcher = {
   useImperativeMethods: useImperativeMethods,
   useLayoutEffect: useLayoutEffect,
   useMemo: useMemo,
-  useMutationEffect: useMutationEffect,
   useReducer: useReducer,
   useRef: useRef,
   useState: useState
@@ -14920,12 +15143,12 @@ var warnAboutInvalidUpdates = void 0;
 
 if (enableSchedulerTracing) {
   // Provide explicit error message when production+profiling bundle of e.g. react-dom
-  // is used with production (non-profiling) bundle of schedule/tracing
+  // is used with production (non-profiling) bundle of scheduler/tracing
   invariant(
     tracing.__interactionsRef != null &&
       tracing.__interactionsRef.current != null,
     "It is not supported to run the profiling version of a renderer (for example, `react-dom/profiling`) " +
-      "without also replacing the `schedule/tracing` module with `schedule/tracing-profiling`. " +
+      "without also replacing the `scheduler/tracing` module with `scheduler/tracing-profiling`. " +
       "Your bundler might have a setting for aliasing both modules. " +
       "Learn more at http://fb.me/react-profiling"
   );
@@ -16422,6 +16645,46 @@ function scheduleWorkToRoot(fiber, expirationTime) {
     }
   }
 
+  if (enableSchedulerTracing) {
+    if (root !== null) {
+      var interactions = tracing.__interactionsRef.current;
+      if (interactions.size > 0) {
+        var pendingInteractionMap = root.pendingInteractionMap;
+        var pendingInteractions = pendingInteractionMap.get(expirationTime);
+        if (pendingInteractions != null) {
+          interactions.forEach(function(interaction) {
+            if (!pendingInteractions.has(interaction)) {
+              // Update the pending async work count for previously unscheduled interaction.
+              interaction.__count++;
+            }
+
+            pendingInteractions.add(interaction);
+          });
+        } else {
+          pendingInteractionMap.set(expirationTime, new Set(interactions));
+
+          // Update the pending async work count for the current interactions.
+          interactions.forEach(function(interaction) {
+            interaction.__count++;
+          });
+        }
+
+        var subscriber = tracing.__subscriberRef.current;
+        if (subscriber !== null) {
+          var threadID = computeThreadID(
+            expirationTime,
+            root.interactionThreadID
+          );
+          subscriber.onWorkScheduled(interactions, threadID);
+        }
+      }
+    }
+  }
+  return root;
+}
+
+function scheduleWork(fiber, expirationTime) {
+  var root = scheduleWorkToRoot(fiber, expirationTime);
   if (root === null) {
     {
       switch (fiber.tag) {
@@ -16436,49 +16699,6 @@ function scheduleWorkToRoot(fiber, expirationTime) {
           break;
       }
     }
-    return null;
-  }
-
-  if (enableSchedulerTracing) {
-    var interactions = tracing.__interactionsRef.current;
-    if (interactions.size > 0) {
-      var pendingInteractionMap = root.pendingInteractionMap;
-      var pendingInteractions = pendingInteractionMap.get(expirationTime);
-      if (pendingInteractions != null) {
-        interactions.forEach(function(interaction) {
-          if (!pendingInteractions.has(interaction)) {
-            // Update the pending async work count for previously unscheduled interaction.
-            interaction.__count++;
-          }
-
-          pendingInteractions.add(interaction);
-        });
-      } else {
-        pendingInteractionMap.set(expirationTime, new Set(interactions));
-
-        // Update the pending async work count for the current interactions.
-        interactions.forEach(function(interaction) {
-          interaction.__count++;
-        });
-      }
-
-      var subscriber = tracing.__subscriberRef.current;
-      if (subscriber !== null) {
-        var threadID = computeThreadID(
-          expirationTime,
-          root.interactionThreadID
-        );
-        subscriber.onWorkScheduled(interactions, threadID);
-      }
-    }
-  }
-
-  return root;
-}
-
-function scheduleWork(fiber, expirationTime) {
-  var root = scheduleWorkToRoot(fiber, expirationTime);
-  if (root === null) {
     return;
   }
 
@@ -16538,7 +16758,7 @@ var isBatchingInteractiveUpdates = false;
 
 var completedBatches = null;
 
-var originalStartTimeMs = now();
+var originalStartTimeMs = now$$1();
 var currentRendererTime = msToExpirationTime(originalStartTimeMs);
 var currentSchedulerTime = currentRendererTime;
 
@@ -16548,7 +16768,7 @@ var nestedUpdateCount = 0;
 var lastCommittedRootDuringThisBatch = null;
 
 function recomputeCurrentRendererTime() {
-  var currentTimeMs = now() - originalStartTimeMs;
+  var currentTimeMs = now$$1() - originalStartTimeMs;
   currentRendererTime = msToExpirationTime(currentTimeMs);
 }
 
@@ -16562,7 +16782,7 @@ function scheduleCallbackWithExpirationTime(root, expirationTime) {
       if (callbackID !== null) {
         // Existing callback has insufficient timeout. Cancel and schedule a
         // new one.
-        cancelDeferredCallback(callbackID);
+        cancelDeferredCallback$$1(callbackID);
       }
     }
     // The request callback timer is already running. Don't start a new one.
@@ -16571,10 +16791,12 @@ function scheduleCallbackWithExpirationTime(root, expirationTime) {
   }
 
   callbackExpirationTime = expirationTime;
-  var currentMs = now() - originalStartTimeMs;
+  var currentMs = now$$1() - originalStartTimeMs;
   var expirationTimeMs = expirationTimeToMs(expirationTime);
   var timeout = expirationTimeMs - currentMs;
-  callbackID = scheduleDeferredCallback(performAsyncWork, { timeout: timeout });
+  callbackID = scheduleDeferredCallback$$1(performAsyncWork, {
+    timeout: timeout
+  });
 }
 
 // For every call to renderRoot, one of onFatal, onComplete, onSuspend, and
@@ -16803,7 +17025,7 @@ function shouldYieldToRenderer() {
   if (didYield) {
     return true;
   }
-  if (shouldYield()) {
+  if (shouldYield$$1()) {
     didYield = true;
     return true;
   }
@@ -17225,7 +17447,7 @@ function updateContainerAtExpirationTime(
   return scheduleRootUpdate(current$$1, element, expirationTime, callback);
 }
 
-function findHostInstance$1(component) {
+function findHostInstance(component) {
   var fiber = get$1(component);
   if (fiber === undefined) {
     if (typeof component.render === "function") {
@@ -17245,7 +17467,7 @@ function findHostInstance$1(component) {
   return hostFiber.stateNode;
 }
 
-function findHostInstanceWithWarning$1(component, methodName) {
+function findHostInstanceWithWarning(component, methodName) {
   {
     var fiber = get$1(component);
     if (fiber === undefined) {
@@ -17300,7 +17522,7 @@ function findHostInstanceWithWarning$1(component, methodName) {
     }
     return hostFiber.stateNode;
   }
-  return findHostInstance$1(component);
+  return findHostInstance(component);
 }
 
 function createContainer(containerInfo, isConcurrent, hydrate) {
@@ -17885,8 +18107,6 @@ var getInspectorDataForViewTag = void 0;
 // TODO: direct imports like some-package/src/* are bad. Fix me.
 // Module provided by RN:
 var ReactCurrentOwner = ReactSharedInternals.ReactCurrentOwner;
-var findHostInstance = findHostInstance$1;
-var findHostInstanceWithWarning = findHostInstanceWithWarning$1;
 
 function findNodeHandle(componentOrHandle) {
   {
diff --git a/Libraries/Renderer/oss/ReactNativeRenderer-prod.js b/Libraries/Renderer/oss/ReactNativeRenderer-prod.js
index 8b5e42b7dcee1d..e9268b6d2dd2e5 100644
--- a/Libraries/Renderer/oss/ReactNativeRenderer-prod.js
+++ b/Libraries/Renderer/oss/ReactNativeRenderer-prod.js
@@ -956,10 +956,6 @@ var eventTypes$1 = {
       }
     }
   },
-  customBubblingEventTypes$1 =
-    ReactNativeViewConfigRegistry.customBubblingEventTypes,
-  customDirectEventTypes$1 =
-    ReactNativeViewConfigRegistry.customDirectEventTypes,
   ReactNativeBridgeEventPlugin = {
     eventTypes: ReactNativeViewConfigRegistry.eventTypes,
     extractEvents: function(
@@ -969,8 +965,10 @@ var eventTypes$1 = {
       nativeEventTarget
     ) {
       if (null == targetInst) return null;
-      var bubbleDispatchConfig = customBubblingEventTypes$1[topLevelType],
-        directDispatchConfig = customDirectEventTypes$1[topLevelType];
+      var bubbleDispatchConfig =
+          ReactNativeViewConfigRegistry.customBubblingEventTypes[topLevelType],
+        directDispatchConfig =
+          ReactNativeViewConfigRegistry.customDirectEventTypes[topLevelType];
       invariant(
         bubbleDispatchConfig || directDispatchConfig,
         'Unsupported top level event type "%s" dispatched',
@@ -1077,9 +1075,6 @@ function _receiveRootNodeIDEvent(rootNodeID, topLevelType, nativeEventParam) {
   });
 }
 RCTEventEmitter.register({
-  getListener: getListener,
-  registrationNames: registrationNameModules,
-  _receiveRootNodeIDEvent: _receiveRootNodeIDEvent,
   receiveEvent: function(rootNodeID, topLevelType, nativeEventParam) {
     _receiveRootNodeIDEvent(rootNodeID, topLevelType, nativeEventParam);
   },
@@ -1606,7 +1601,7 @@ function setTimeoutCallback() {
 function shim$1() {
   invariant(
     !1,
-    "The current renderer does not support hyration. This error is likely caused by a bug in React. Please file an issue."
+    "The current renderer does not support hydration. This error is likely caused by a bug in React. Please file an issue."
   );
 }
 var UPDATE_SIGNAL = {},
@@ -1642,17 +1637,19 @@ function getStackByFiberInDevAndProd(workInProgress) {
   var info = "";
   do {
     a: switch (workInProgress.tag) {
-      case 2:
-      case 16:
-      case 0:
-      case 1:
-      case 5:
-      case 8:
-      case 13:
+      case 3:
+      case 4:
+      case 6:
+      case 7:
+      case 10:
+      case 9:
+        var JSCompiler_inline_result = "";
+        break a;
+      default:
         var owner = workInProgress._debugOwner,
           source = workInProgress._debugSource,
           name = getComponentName(workInProgress.type);
-        var JSCompiler_inline_result = null;
+        JSCompiler_inline_result = null;
         owner && (JSCompiler_inline_result = getComponentName(owner.type));
         owner = name;
         name = "";
@@ -1666,9 +1663,6 @@ function getStackByFiberInDevAndProd(workInProgress) {
           : JSCompiler_inline_result &&
             (name = " (created by " + JSCompiler_inline_result + ")");
         JSCompiler_inline_result = "\n    in " + (owner || "Unknown") + name;
-        break a;
-      default:
-        JSCompiler_inline_result = "";
     }
     info += JSCompiler_inline_result;
     workInProgress = workInProgress.return;
@@ -3402,7 +3396,8 @@ function updateMemoComponent(
       "function" === typeof type &&
       !shouldConstruct(type) &&
       void 0 === type.defaultProps &&
-      null === Component.compare
+      null === Component.compare &&
+      void 0 === Component.defaultProps
     )
       return (
         (workInProgress.tag = 15),
@@ -3840,7 +3835,6 @@ function updateSuspenseComponent(
         nextDidTimeout
           ? ((renderExpirationTime = nextProps.fallback),
             (nextProps = createWorkInProgress(mode, mode.pendingProps, 0)),
-            (nextProps.effectTag |= 2),
             0 === (workInProgress.mode & 1) &&
               ((nextDidTimeout =
                 null !== workInProgress.memoizedState
@@ -3853,7 +3847,6 @@ function updateSuspenseComponent(
               renderExpirationTime,
               current$$1.expirationTime
             )),
-            (mode.effectTag |= 2),
             (renderExpirationTime = nextProps),
             (nextProps.childExpirationTime = 0),
             (renderExpirationTime.return = mode.return = workInProgress))
@@ -3867,9 +3860,7 @@ function updateSuspenseComponent(
         nextDidTimeout
           ? ((nextDidTimeout = nextProps.fallback),
             (nextProps = createFiberFromFragment(null, mode, 0, null)),
-            (nextProps.effectTag |= 2),
             (nextProps.child = current$$1),
-            (current$$1.return = nextProps),
             0 === (workInProgress.mode & 1) &&
               (nextProps.child =
                 null !== workInProgress.memoizedState
@@ -4105,8 +4096,9 @@ function beginWork(current$$1, workInProgress, renderExpirationTime) {
         default:
           invariant(
             !1,
-            "Element type is invalid. Received a promise that resolves to: %s. Promise elements must resolve to a class or function.",
-            current$$1
+            "Element type is invalid. Received a promise that resolves to: %s. Lazy element type must resolve to a class or function.%s",
+            current$$1,
+            ""
           );
       }
       return getDerivedStateFromProps;
@@ -4413,9 +4405,10 @@ function beginWork(current$$1, workInProgress, renderExpirationTime) {
       return (
         (context = workInProgress.type),
         (hasContext = resolveDefaultProps(
-          context.type,
+          context,
           workInProgress.pendingProps
         )),
+        (hasContext = resolveDefaultProps(context.type, hasContext)),
         updateMemoComponent(
           current$$1,
           workInProgress,
@@ -4942,7 +4935,12 @@ function commitWork(current$$1, finishedWork) {
             }
           else {
             if (6 === newProps.tag) throw Error("Not yet implemented.");
-            if (null !== newProps.child) {
+            if (13 === newProps.tag && null !== newProps.memoizedState) {
+              current$$1 = newProps.child.sibling;
+              current$$1.return = newProps;
+              newProps = current$$1;
+              continue;
+            } else if (null !== newProps.child) {
               newProps.child.return = newProps;
               newProps = newProps.child;
               continue;
@@ -5225,20 +5223,22 @@ function completeUnitOfWork(workInProgress) {
               break a;
             }
             newProps = null !== newProps;
-            type = null !== current && null !== current.memoizedState;
+            renderExpirationTime =
+              null !== current && null !== current.memoizedState;
             null !== current &&
               !newProps &&
-              type &&
-              ((current = current.child.sibling),
-              null !== current &&
-                reconcileChildFibers(
-                  current$$1,
-                  current,
-                  null,
-                  renderExpirationTime
-                ));
+              renderExpirationTime &&
+              ((type = current.child.sibling),
+              null !== type &&
+                ((current = current$$1.firstEffect),
+                null !== current
+                  ? ((current$$1.firstEffect = type),
+                    (type.nextEffect = current))
+                  : ((current$$1.firstEffect = current$$1.lastEffect = type),
+                    (type.nextEffect = null)),
+                (type.effectTag = 8)));
             if (
-              newProps !== type ||
+              newProps !== renderExpirationTime ||
               (0 === (current$$1.effectTag & 1) && newProps)
             )
               current$$1.effectTag |= 4;
@@ -5432,14 +5432,7 @@ function renderRoot(root$jscomp$0, isYieldy) {
                   thenable.then(returnFiber$jscomp$0, returnFiber$jscomp$0);
                   if (0 === (value.mode & 1)) {
                     value.effectTag |= 64;
-                    reconcileChildren(
-                      sourceFiber$jscomp$0.alternate,
-                      sourceFiber$jscomp$0,
-                      null,
-                      returnFiber
-                    );
-                    sourceFiber$jscomp$0.effectTag &= -1025;
-                    sourceFiber$jscomp$0.effectTag &= -933;
+                    sourceFiber$jscomp$0.effectTag &= -1957;
                     1 === sourceFiber$jscomp$0.tag &&
                       null === sourceFiber$jscomp$0.alternate &&
                       (sourceFiber$jscomp$0.tag = 17);
@@ -5696,7 +5689,7 @@ function scheduleWorkToRoot(fiber, expirationTime) {
       }
       node = node.return;
     }
-  return null === root ? null : root;
+  return root;
 }
 function scheduleWork(fiber, expirationTime) {
   fiber = scheduleWorkToRoot(fiber, expirationTime);
@@ -6121,13 +6114,18 @@ function completeRoot(root, finishedWork$jscomp$0, expirationTime) {
             commitWork(nextEffect.alternate, nextEffect);
             break;
           case 8:
-            (prevState = nextEffect),
-              unmountHostComponents(prevState),
-              (prevState.return = null),
-              (prevState.child = null),
-              prevState.alternate &&
-                ((prevState.alternate.child = null),
-                (prevState.alternate.return = null));
+            prevState = nextEffect;
+            unmountHostComponents(prevState);
+            prevState.return = null;
+            prevState.child = null;
+            prevState.memoizedState = null;
+            prevState.updateQueue = null;
+            var alternate = prevState.alternate;
+            null !== alternate &&
+              ((alternate.return = null),
+              (alternate.child = null),
+              (alternate.memoizedState = null),
+              (alternate.updateQueue = null));
         }
         nextEffect = nextEffect.nextEffect;
       }
@@ -6151,24 +6149,24 @@ function completeRoot(root, finishedWork$jscomp$0, expirationTime) {
         var effectTag$jscomp$0 = nextEffect.effectTag;
         if (effectTag$jscomp$0 & 36) {
           var current$$1$jscomp$1 = nextEffect.alternate;
-          current$$1 = nextEffect;
-          prevProps = currentRef;
-          switch (current$$1.tag) {
+          alternate = nextEffect;
+          current$$1 = currentRef;
+          switch (alternate.tag) {
             case 0:
             case 11:
             case 15:
               break;
             case 1:
-              var instance$jscomp$0 = current$$1.stateNode;
-              if (current$$1.effectTag & 4)
+              var instance$jscomp$0 = alternate.stateNode;
+              if (alternate.effectTag & 4)
                 if (null === current$$1$jscomp$1)
                   instance$jscomp$0.componentDidMount();
                 else {
                   var prevProps$jscomp$0 =
-                    current$$1.elementType === current$$1.type
+                    alternate.elementType === alternate.type
                       ? current$$1$jscomp$1.memoizedProps
                       : resolveDefaultProps(
-                          current$$1.type,
+                          alternate.type,
                           current$$1$jscomp$1.memoizedProps
                         );
                   instance$jscomp$0.componentDidUpdate(
@@ -6177,32 +6175,32 @@ function completeRoot(root, finishedWork$jscomp$0, expirationTime) {
                     instance$jscomp$0.__reactInternalSnapshotBeforeUpdate
                   );
                 }
-              var updateQueue = current$$1.updateQueue;
+              var updateQueue = alternate.updateQueue;
               null !== updateQueue &&
                 commitUpdateQueue(
-                  current$$1,
+                  alternate,
                   updateQueue,
                   instance$jscomp$0,
-                  prevProps
+                  current$$1
                 );
               break;
             case 3:
-              var _updateQueue = current$$1.updateQueue;
+              var _updateQueue = alternate.updateQueue;
               if (null !== _updateQueue) {
-                prevState = null;
-                if (null !== current$$1.child)
-                  switch (current$$1.child.tag) {
+                prevProps = null;
+                if (null !== alternate.child)
+                  switch (alternate.child.tag) {
                     case 5:
-                      prevState = current$$1.child.stateNode;
+                      prevProps = alternate.child.stateNode;
                       break;
                     case 1:
-                      prevState = current$$1.child.stateNode;
+                      prevProps = alternate.child.stateNode;
                   }
                 commitUpdateQueue(
-                  current$$1,
+                  alternate,
                   _updateQueue,
-                  prevState,
-                  prevProps
+                  prevProps,
+                  current$$1
                 );
               }
               break;
@@ -6276,7 +6274,7 @@ function onUncaughtError(error) {
   nextFlushedRoot.expirationTime = 0;
   hasUnhandledError || ((hasUnhandledError = !0), (unhandledError = error));
 }
-function findHostInstance$1(component) {
+function findHostInstance(component) {
   var fiber = component._reactInternalFiber;
   void 0 === fiber &&
     ("function" === typeof component.render
@@ -6389,7 +6387,7 @@ function findNodeHandle(componentOrHandle) {
   if (componentOrHandle._nativeTag) return componentOrHandle._nativeTag;
   if (componentOrHandle.canonical && componentOrHandle.canonical._nativeTag)
     return componentOrHandle.canonical._nativeTag;
-  componentOrHandle = findHostInstance$1(componentOrHandle);
+  componentOrHandle = findHostInstance(componentOrHandle);
   return null == componentOrHandle
     ? componentOrHandle
     : componentOrHandle.canonical
@@ -6485,7 +6483,7 @@ var roots = new Map(),
         };
         return ReactNativeComponent;
       })(React.Component);
-    })(findNodeHandle, findHostInstance$1),
+    })(findNodeHandle, findHostInstance),
     findNodeHandle: findNodeHandle,
     render: function(element, containerTag, callback) {
       var root = roots.get(containerTag);
@@ -6598,7 +6596,7 @@ var roots = new Map(),
             TextInputState.blurTextInput(findNodeHandle(this));
           }
         };
-      })(findNodeHandle, findHostInstance$1),
+      })(findNodeHandle, findHostInstance),
       computeComponentStackForErrorReporting: function(reactTag) {
         return (reactTag = getInstanceFromTag(reactTag))
           ? getStackByFiberInDevAndProd(reactTag)
diff --git a/Libraries/Renderer/oss/ReactNativeRenderer-profiling.js b/Libraries/Renderer/oss/ReactNativeRenderer-profiling.js
index 7a8ebe32ee53c9..4d323e348dd55e 100644
--- a/Libraries/Renderer/oss/ReactNativeRenderer-profiling.js
+++ b/Libraries/Renderer/oss/ReactNativeRenderer-profiling.js
@@ -957,10 +957,6 @@ var eventTypes$1 = {
       }
     }
   },
-  customBubblingEventTypes$1 =
-    ReactNativeViewConfigRegistry.customBubblingEventTypes,
-  customDirectEventTypes$1 =
-    ReactNativeViewConfigRegistry.customDirectEventTypes,
   ReactNativeBridgeEventPlugin = {
     eventTypes: ReactNativeViewConfigRegistry.eventTypes,
     extractEvents: function(
@@ -970,8 +966,10 @@ var eventTypes$1 = {
       nativeEventTarget
     ) {
       if (null == targetInst) return null;
-      var bubbleDispatchConfig = customBubblingEventTypes$1[topLevelType],
-        directDispatchConfig = customDirectEventTypes$1[topLevelType];
+      var bubbleDispatchConfig =
+          ReactNativeViewConfigRegistry.customBubblingEventTypes[topLevelType],
+        directDispatchConfig =
+          ReactNativeViewConfigRegistry.customDirectEventTypes[topLevelType];
       invariant(
         bubbleDispatchConfig || directDispatchConfig,
         'Unsupported top level event type "%s" dispatched',
@@ -1078,9 +1076,6 @@ function _receiveRootNodeIDEvent(rootNodeID, topLevelType, nativeEventParam) {
   });
 }
 RCTEventEmitter.register({
-  getListener: getListener,
-  registrationNames: registrationNameModules,
-  _receiveRootNodeIDEvent: _receiveRootNodeIDEvent,
   receiveEvent: function(rootNodeID, topLevelType, nativeEventParam) {
     _receiveRootNodeIDEvent(rootNodeID, topLevelType, nativeEventParam);
   },
@@ -1607,7 +1602,7 @@ function setTimeoutCallback() {
 function shim$1() {
   invariant(
     !1,
-    "The current renderer does not support hyration. This error is likely caused by a bug in React. Please file an issue."
+    "The current renderer does not support hydration. This error is likely caused by a bug in React. Please file an issue."
   );
 }
 var UPDATE_SIGNAL = {},
@@ -1643,17 +1638,19 @@ function getStackByFiberInDevAndProd(workInProgress) {
   var info = "";
   do {
     a: switch (workInProgress.tag) {
-      case 2:
-      case 16:
-      case 0:
-      case 1:
-      case 5:
-      case 8:
-      case 13:
+      case 3:
+      case 4:
+      case 6:
+      case 7:
+      case 10:
+      case 9:
+        var JSCompiler_inline_result = "";
+        break a;
+      default:
         var owner = workInProgress._debugOwner,
           source = workInProgress._debugSource,
           name = getComponentName(workInProgress.type);
-        var JSCompiler_inline_result = null;
+        JSCompiler_inline_result = null;
         owner && (JSCompiler_inline_result = getComponentName(owner.type));
         owner = name;
         name = "";
@@ -1667,9 +1664,6 @@ function getStackByFiberInDevAndProd(workInProgress) {
           : JSCompiler_inline_result &&
             (name = " (created by " + JSCompiler_inline_result + ")");
         JSCompiler_inline_result = "\n    in " + (owner || "Unknown") + name;
-        break a;
-      default:
-        JSCompiler_inline_result = "";
     }
     info += JSCompiler_inline_result;
     workInProgress = workInProgress.return;
@@ -3460,7 +3454,8 @@ function updateMemoComponent(
       "function" === typeof type &&
       !shouldConstruct(type) &&
       void 0 === type.defaultProps &&
-      null === Component.compare
+      null === Component.compare &&
+      void 0 === Component.defaultProps
     )
       return (
         (workInProgress.tag = 15),
@@ -3908,7 +3903,6 @@ function updateSuspenseComponent(
         current$$1.pendingProps,
         0
       );
-      renderExpirationTime.effectTag |= 2;
       0 === (workInProgress.mode & 1) &&
         ((nextDidTimeout =
           null !== workInProgress.memoizedState
@@ -3928,7 +3922,6 @@ function updateSuspenseComponent(
         nextProps,
         mode.expirationTime
       );
-      nextProps.effectTag |= 2;
       mode = renderExpirationTime;
       renderExpirationTime.childExpirationTime = 0;
       renderExpirationTime = nextProps;
@@ -3943,9 +3936,7 @@ function updateSuspenseComponent(
   else if (((current$$1 = current$$1.child), nextDidTimeout)) {
     nextDidTimeout = nextProps.fallback;
     nextProps = createFiberFromFragment(null, mode, 0, null);
-    nextProps.effectTag |= 2;
     nextProps.child = current$$1;
-    current$$1.return = nextProps;
     0 === (workInProgress.mode & 1) &&
       (nextProps.child =
         null !== workInProgress.memoizedState
@@ -4193,8 +4184,9 @@ function beginWork(current$$1, workInProgress, renderExpirationTime) {
         default:
           invariant(
             !1,
-            "Element type is invalid. Received a promise that resolves to: %s. Promise elements must resolve to a class or function.",
-            current$$1
+            "Element type is invalid. Received a promise that resolves to: %s. Lazy element type must resolve to a class or function.%s",
+            current$$1,
+            ""
           );
       }
       return getDerivedStateFromProps;
@@ -4502,9 +4494,10 @@ function beginWork(current$$1, workInProgress, renderExpirationTime) {
       return (
         (context = workInProgress.type),
         (hasContext = resolveDefaultProps(
-          context.type,
+          context,
           workInProgress.pendingProps
         )),
+        (hasContext = resolveDefaultProps(context.type, hasContext)),
         updateMemoComponent(
           current$$1,
           workInProgress,
@@ -5031,7 +5024,12 @@ function commitWork(current$$1, finishedWork) {
             }
           else {
             if (6 === newProps.tag) throw Error("Not yet implemented.");
-            if (null !== newProps.child) {
+            if (13 === newProps.tag && null !== newProps.memoizedState) {
+              current$$1 = newProps.child.sibling;
+              current$$1.return = newProps;
+              newProps = current$$1;
+              continue;
+            } else if (null !== newProps.child) {
               newProps.child.return = newProps;
               newProps = newProps.child;
               continue;
@@ -5149,14 +5147,7 @@ function throwException(
         thenable.then(returnFiber, returnFiber);
         if (0 === (value.mode & 1)) {
           value.effectTag |= 64;
-          reconcileChildren(
-            sourceFiber.alternate,
-            sourceFiber,
-            null,
-            renderExpirationTime
-          );
-          sourceFiber.effectTag &= -1025;
-          sourceFiber.effectTag &= -933;
+          sourceFiber.effectTag &= -1957;
           1 === sourceFiber.tag &&
             null === sourceFiber.alternate &&
             (sourceFiber.tag = 17);
@@ -5276,7 +5267,7 @@ var DispatcherWithoutHooks = { readContext: readContext },
 invariant(
   null != tracing.__interactionsRef &&
     null != tracing.__interactionsRef.current,
-  "It is not supported to run the profiling version of a renderer (for example, `react-dom/profiling`) without also replacing the `schedule/tracing` module with `schedule/tracing-profiling`. Your bundler might have a setting for aliasing both modules. Learn more at http://fb.me/react-profiling"
+  "It is not supported to run the profiling version of a renderer (for example, `react-dom/profiling`) without also replacing the `scheduler/tracing` module with `scheduler/tracing-profiling`. Your bundler might have a setting for aliasing both modules. Learn more at http://fb.me/react-profiling"
 );
 var isWorking = !1,
   nextUnitOfWork = null,
@@ -5356,9 +5347,14 @@ function commitAllHostEffects() {
           unmountHostComponents(effectTag),
           (effectTag.return = null),
           (effectTag.child = null),
-          effectTag.alternate &&
-            ((effectTag.alternate.child = null),
-            (effectTag.alternate.return = null));
+          (effectTag.memoizedState = null),
+          (effectTag.updateQueue = null),
+          (effectTag = effectTag.alternate),
+          null !== effectTag &&
+            ((effectTag.return = null),
+            (effectTag.child = null),
+            (effectTag.memoizedState = null),
+            (effectTag.updateQueue = null));
     }
     nextEffect = nextEffect.nextEffect;
   }
@@ -5769,19 +5765,24 @@ function completeUnitOfWork(workInProgress) {
               break a;
             }
             fiber = null !== fiber;
-            type = null !== current && null !== current.memoizedState;
+            renderExpirationTime =
+              null !== current && null !== current.memoizedState;
             null !== current &&
               !fiber &&
-              type &&
-              ((current = current.child.sibling),
-              null !== current &&
-                reconcileChildFibers(
-                  current$$1,
-                  current,
-                  null,
-                  renderExpirationTime
-                ));
-            if (fiber !== type || (0 === (current$$1.effectTag & 1) && fiber))
+              renderExpirationTime &&
+              ((type = current.child.sibling),
+              null !== type &&
+                ((current = current$$1.firstEffect),
+                null !== current
+                  ? ((current$$1.firstEffect = type),
+                    (type.nextEffect = current))
+                  : ((current$$1.firstEffect = current$$1.lastEffect = type),
+                    (type.nextEffect = null)),
+                (type.effectTag = 8)));
+            if (
+              fiber !== renderExpirationTime ||
+              (0 === (current$$1.effectTag & 1) && fiber)
+            )
               current$$1.effectTag |= 4;
             break;
           case 7:
@@ -6147,9 +6148,10 @@ function scheduleWorkToRoot(fiber, expirationTime) {
       }
       node = node.return;
     }
-  if (null === root) return null;
-  fiber = tracing.__interactionsRef.current;
-  if (0 < fiber.size) {
+  if (
+    null !== root &&
+    ((fiber = tracing.__interactionsRef.current), 0 < fiber.size)
+  ) {
     alternate = root.pendingInteractionMap;
     var pendingInteractions = alternate.get(expirationTime);
     null != pendingInteractions
@@ -6478,7 +6480,7 @@ function onUncaughtError(error) {
   nextFlushedRoot.expirationTime = 0;
   hasUnhandledError || ((hasUnhandledError = !0), (unhandledError = error));
 }
-function findHostInstance$1(component) {
+function findHostInstance(component) {
   var fiber = component._reactInternalFiber;
   void 0 === fiber &&
     ("function" === typeof component.render
@@ -6591,7 +6593,7 @@ function findNodeHandle(componentOrHandle) {
   if (componentOrHandle._nativeTag) return componentOrHandle._nativeTag;
   if (componentOrHandle.canonical && componentOrHandle.canonical._nativeTag)
     return componentOrHandle.canonical._nativeTag;
-  componentOrHandle = findHostInstance$1(componentOrHandle);
+  componentOrHandle = findHostInstance(componentOrHandle);
   return null == componentOrHandle
     ? componentOrHandle
     : componentOrHandle.canonical
@@ -6687,7 +6689,7 @@ var roots = new Map(),
         };
         return ReactNativeComponent;
       })(React.Component);
-    })(findNodeHandle, findHostInstance$1),
+    })(findNodeHandle, findHostInstance),
     findNodeHandle: findNodeHandle,
     render: function(element, containerTag, callback) {
       var root = roots.get(containerTag);
@@ -6805,7 +6807,7 @@ var roots = new Map(),
             TextInputState.blurTextInput(findNodeHandle(this));
           }
         };
-      })(findNodeHandle, findHostInstance$1),
+      })(findNodeHandle, findHostInstance),
       computeComponentStackForErrorReporting: function(reactTag) {
         return (reactTag = getInstanceFromTag(reactTag))
           ? getStackByFiberInDevAndProd(reactTag)
diff --git a/Libraries/Renderer/shims/ReactTypes.js b/Libraries/Renderer/shims/ReactTypes.js
index 080ade12b807b0..f09207928ceaff 100644
--- a/Libraries/Renderer/shims/ReactTypes.js
+++ b/Libraries/Renderer/shims/ReactTypes.js
@@ -59,6 +59,7 @@ export type ReactContext<T> = {
 
   _currentValue: T,
   _currentValue2: T,
+  _threadCount: number,
 
   // DEV only
   _currentRenderer?: Object | null,
diff --git a/package.json b/package.json
index ada9d72f2be62a..842bc5ced5c14c 100644
--- a/package.json
+++ b/package.json
@@ -145,7 +145,7 @@
     "react-native": "local-cli/wrong-react-native.js"
   },
   "peerDependencies": {
-    "react": "16.6.1"
+    "react": "16.6.3"
   },
   "dependencies": {
     "@babel/runtime": "^7.0.0",
@@ -220,9 +220,9 @@
     "jest": "23.4.1",
     "jest-junit": "5.1.0",
     "prettier": "1.13.6",
-    "react": "16.6.1",
+    "react": "16.6.3",
     "react-native-dummy": "0.1.0",
-    "react-test-renderer": "16.6.1",
+    "react-test-renderer": "16.6.3",
     "shelljs": "^0.7.8"
   },
   "detox": {
diff --git a/yarn.lock b/yarn.lock
index 48866ce9960990..51e921e3060e88 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2398,12 +2398,13 @@ fbjs-scripts@^1.0.0:
     semver "^5.1.0"
     through2 "^2.0.0"
 
-fbjs@^0.8.9:
-  version "0.8.17"
-  resolved "https://registry.yarnpkg.com/fbjs/-/fbjs-0.8.17.tgz#c4d598ead6949112653d6588b01a5cdcd9f90fdd"
-  integrity sha1-xNWY6taUkRJlPWWIsBpc3Nn5D90=
+fbjs@1.0.0, fbjs@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/fbjs/-/fbjs-1.0.0.tgz#52c215e0883a3c86af2a7a776ed51525ae8e0a5a"
+  integrity sha512-MUgcMEJaFhCaF1QtWGnmq9ZDRAzECTCRAF7O6UZIlAlkTs1SasiX9aP0Iw7wfD2mJ7wDTNfg2w7u5fSCwJk1OA==
   dependencies:
-    core-js "^1.0.0"
+    core-js "^2.4.1"
+    fbjs-css-vars "^1.0.0"
     isomorphic-fetch "^2.1.1"
     loose-envify "^1.0.0"
     object-assign "^4.1.0"
@@ -2411,13 +2412,12 @@ fbjs@^0.8.9:
     setimmediate "^1.0.5"
     ua-parser-js "^0.7.18"
 
-fbjs@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/fbjs/-/fbjs-1.0.0.tgz#52c215e0883a3c86af2a7a776ed51525ae8e0a5a"
-  integrity sha512-MUgcMEJaFhCaF1QtWGnmq9ZDRAzECTCRAF7O6UZIlAlkTs1SasiX9aP0Iw7wfD2mJ7wDTNfg2w7u5fSCwJk1OA==
+fbjs@^0.8.9:
+  version "0.8.17"
+  resolved "https://registry.yarnpkg.com/fbjs/-/fbjs-0.8.17.tgz#c4d598ead6949112653d6588b01a5cdcd9f90fdd"
+  integrity sha1-xNWY6taUkRJlPWWIsBpc3Nn5D90=
   dependencies:
-    core-js "^2.4.1"
-    fbjs-css-vars "^1.0.0"
+    core-js "^1.0.0"
     isomorphic-fetch "^2.1.1"
     loose-envify "^1.0.0"
     object-assign "^4.1.0"
@@ -5090,10 +5090,10 @@ react-devtools-core@^3.4.2:
     shell-quote "^1.6.1"
     ws "^3.3.1"
 
-react-is@^16.6.1:
-  version "16.6.1"
-  resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.6.1.tgz#f77b1c3d901be300abe8d58645b7a59e794e5982"
-  integrity sha512-wOKsGtvTMYs7WAscmwwdM8sfRRvE17Ym30zFj3n37Qx5tHRfhenPKEPILHaHob6WoLFADmQm1ZNrE5xMCM6sCw==
+react-is@^16.6.3:
+  version "16.6.3"
+  resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.6.3.tgz#d2d7462fcfcbe6ec0da56ad69047e47e56e7eac0"
+  integrity sha512-u7FDWtthB4rWibG/+mFbVd5FvdI20yde86qKGx4lVUTWmPlSWQ4QxbBIrrs+HnXGbxOUlUzTAP/VDmvCwaP2yA==
 
 react-native-dummy@0.1.0:
   version "0.1.0"
@@ -5108,15 +5108,15 @@ react-proxy@^1.1.7:
     lodash "^4.6.1"
     react-deep-force-update "^1.0.0"
 
-react-test-renderer@16.6.1:
-  version "16.6.1"
-  resolved "https://registry.yarnpkg.com/react-test-renderer/-/react-test-renderer-16.6.1.tgz#8ea357652be3cf81cbd6b2f686e74ebe67c17b78"
-  integrity sha512-sgZwJZYIgQptRi2qk5+gB8FBQGk4gLSs0gmKZPMfhd3dLkdxIUwVLHteLN3Bnj4LokIZd3U+V2NEJUqeV2PT2w==
+react-test-renderer@16.6.3:
+  version "16.6.3"
+  resolved "https://registry.yarnpkg.com/react-test-renderer/-/react-test-renderer-16.6.3.tgz#5f3a1a7d5c3379d46f7052b848b4b72e47c89f38"
+  integrity sha512-B5bCer+qymrQz/wN03lT0LppbZUDRq6AMfzMKrovzkGzfO81a9T+PWQW6MzkWknbwODQH/qpJno/yFQLX5IWrQ==
   dependencies:
     object-assign "^4.1.1"
     prop-types "^15.6.2"
-    react-is "^16.6.1"
-    scheduler "^0.11.0"
+    react-is "^16.6.3"
+    scheduler "^0.11.2"
 
 react-timer-mixin@^0.13.2:
   version "0.13.4"
@@ -5131,15 +5131,15 @@ react-transform-hmr@^1.0.4:
     global "^4.3.0"
     react-proxy "^1.1.7"
 
-react@16.6.1:
-  version "16.6.1"
-  resolved "https://registry.yarnpkg.com/react/-/react-16.6.1.tgz#ee2aef4f0a09e494594882029821049772f915fe"
-  integrity sha512-OtawJThYlvRgm9BXK+xTL7BIlDx8vv21j+fbQDjRRUyok6y7NyjlweGorielTahLZHYIdKUoK2Dp9ByVWuMqxw==
+react@16.6.3:
+  version "16.6.3"
+  resolved "https://registry.yarnpkg.com/react/-/react-16.6.3.tgz#25d77c91911d6bbdd23db41e70fb094cc1e0871c"
+  integrity sha512-zCvmH2vbEolgKxtqXL2wmGCUxUyNheYn/C+PD1YAjfxHC54+MhdruyhO7QieQrYsYeTxrn93PM2y0jRH1zEExw==
   dependencies:
     loose-envify "^1.1.0"
     object-assign "^4.1.1"
     prop-types "^15.6.2"
-    scheduler "^0.11.0"
+    scheduler "^0.11.2"
 
 read-pkg-up@^1.0.1:
   version "1.0.1"
@@ -5538,10 +5538,10 @@ sax@~1.1.1:
   resolved "http://registry.npmjs.org/sax/-/sax-1.1.6.tgz#5d616be8a5e607d54e114afae55b7eaf2fcc3240"
   integrity sha1-XWFr6KXmB9VOEUr65Vt+ry/MMkA=
 
-scheduler@^0.11.0:
-  version "0.11.0"
-  resolved "https://registry.yarnpkg.com/scheduler/-/scheduler-0.11.0.tgz#def1f1bfa6550cc57981a87106e65e8aea41a6b5"
-  integrity sha512-MAYbBfmiEHxF0W+c4CxMpEqMYK+rYF584VP/qMKSiHM6lTkBKKYOJaDiSILpJHla6hBOsVd6GucPL46o2Uq3sg==
+scheduler@^0.11.2:
+  version "0.11.2"
+  resolved "https://registry.yarnpkg.com/scheduler/-/scheduler-0.11.2.tgz#a8db5399d06eba5abac51b705b7151d2319d33d3"
+  integrity sha512-+WCP3s3wOaW4S7C1tl3TEXp4l9lJn0ZK8G3W3WKRWmw77Z2cIFUW2MiNTMHn5sCjxN+t7N43HAOOgMjyAg5hlg==
   dependencies:
     loose-envify "^1.1.0"
     object-assign "^4.1.1"