From 9362bda2e43ddadb365c25575c5d70748efd5342 Mon Sep 17 00:00:00 2001
From: Jan Kassens <jkassens@meta.com>
Date: Wed, 21 Dec 2022 14:16:54 -0500
Subject: [PATCH] [flow] enable enforce_local_inference_annotations

---
 packages/react-cache/src/ReactCacheOld.js     |  1 +
 .../react-devtools-core/src/standalone.js     |  1 +
 .../react-devtools-extensions/src/backend.js  |  2 ++
 packages/react-devtools-inline/src/backend.js |  2 ++
 .../react-devtools-inline/src/frontend.js     |  1 +
 .../src/backend/console.js                    |  2 ++
 .../src/devtools/ContextMenu/ContextMenu.js   |  1 +
 .../devtools/views/Components/Components.js   |  1 +
 .../views/Components/EditableValue.js         |  3 +++
 .../src/devtools/views/Components/Element.js  |  5 +++++
 .../Components/InspectedElementContextTree.js |  1 +
 .../Components/InspectedElementHooksTree.js   |  1 +
 .../src/devtools/views/Components/KeyValue.js |  2 ++
 .../NativeStyleEditor/AutoSizeInput.js        |  1 +
 .../NativeStyleEditor/StyleEditor.js          |  3 +++
 .../views/Components/NewArrayValue.js         |  1 +
 .../devtools/views/Components/NewKeyValue.js  |  1 +
 .../src/devtools/views/Components/Tree.js     |  1 +
 .../Profiler/SidebarSelectedFiberInfo.js      |  1 +
 .../views/Profiler/SnapshotSelector.js        |  4 ++++
 .../src/devtools/views/SearchInput.js         |  2 ++
 .../src/devtools/views/hooks.js               |  1 +
 .../src/app/EditableProps/index.js            |  2 ++
 .../src/app/ErrorBoundaries/index.js          |  1 +
 .../src/app/Iframe/index.js                   |  1 +
 .../src/app/InlineWarnings/index.js           | 19 +++++++++++++++++++
 .../src/app/InspectableElements/Contexts.js   |  4 ++++
 .../src/app/SuspenseTree/index.js             |  1 +
 .../react-devtools-shell/src/app/index.js     |  1 +
 .../src/e2e-apps/ListApp.js                   |  1 +
 .../src/e2e-apps/ListAppLegacy.js             |  1 +
 .../react-devtools-timeline/src/Timeline.js   |  1 +
 .../src/client/inputValueTracking.js          |  1 +
 .../src/events/SyntheticEvent.js              |  1 +
 .../src/events/plugins/ChangeEventPlugin.js   |  2 ++
 .../src/server/ReactDOMServerFormatConfig.js  |  2 ++
 .../src/server/ReactDOMLegacyServerImpl.js    |  2 ++
 .../server/ReactDOMLegacyServerNodeStream.js  |  2 ++
 .../src/dom/create-event-handle/Focus.js      |  1 +
 .../react-native-renderer/src/ReactFabric.js  |  2 ++
 .../src/ReactFabricHostConfig.js              |  1 +
 .../src/ReactNativeBridgeEventPlugin.js       |  7 +++++++
 .../src/ReactNativeEventEmitter.js            |  1 +
 .../src/ReactNativeFiberInspector.js          |  5 +++++
 .../src/ReactNativeGetListeners.js            |  1 +
 .../src/ReactNativeRenderer.js                |  1 +
 .../src/legacy-events/EventBatching.js        |  1 +
 .../src/ReactFiberClassComponent.js           |  2 ++
 .../react-reconciler/src/ReactFiberRoot.js    |  1 +
 .../src/ReactFiberWorkLoop.js                 |  3 ++-
 .../ReactFlightDOMRelayClientHostConfig.js    |  1 +
 .../src/ReactFlightWebpackNodeRegister.js     |  1 +
 .../src/ReactFlightWebpackPlugin.js           |  2 ++
 .../ReactFlightNativeRelayClientHostConfig.js |  1 +
 .../src/ReactFizzClassComponent.js            |  2 ++
 packages/react-server/src/ReactFizzServer.js  |  1 +
 .../src/ReactTestRenderer.js                  |  4 ++++
 packages/react/src/ReactLazy.js               |  2 ++
 packages/shared/invokeGuardedCallbackImpl.js  |  1 +
 scripts/flow/config/flowconfig                |  2 +-
 60 files changed, 121 insertions(+), 2 deletions(-)

diff --git a/packages/react-cache/src/ReactCacheOld.js b/packages/react-cache/src/ReactCacheOld.js
index d101565415db4..99716076984c0 100644
--- a/packages/react-cache/src/ReactCacheOld.js
+++ b/packages/react-cache/src/ReactCacheOld.js
@@ -62,6 +62,7 @@ function readContext(Context: ReactContext<mixed>) {
   return dispatcher.readContext(Context);
 }
 
+// $FlowFixMe[missing-local-annot]
 function identityHashFn(input) {
   if (__DEV__) {
     if (
diff --git a/packages/react-devtools-core/src/standalone.js b/packages/react-devtools-core/src/standalone.js
index ba4efd813d165..22cf1677003e1 100644
--- a/packages/react-devtools-core/src/standalone.js
+++ b/packages/react-devtools-core/src/standalone.js
@@ -167,6 +167,7 @@ function onDisconnected() {
   disconnectedCallback();
 }
 
+// $FlowFixMe[missing-local-annot]
 function onError({code, message}) {
   safeUnmount();
 
diff --git a/packages/react-devtools-extensions/src/backend.js b/packages/react-devtools-extensions/src/backend.js
index 533551003330c..5c397c3ee2128 100644
--- a/packages/react-devtools-extensions/src/backend.js
+++ b/packages/react-devtools-extensions/src/backend.js
@@ -8,6 +8,7 @@
 
 let welcomeHasInitialized = false;
 
+// $FlowFixMe[missing-local-annot]
 function welcome(event) {
   if (
     event.source !== window ||
@@ -55,6 +56,7 @@ function setup(hook: any) {
 
   const bridge = new Bridge({
     listen(fn) {
+      // $FlowFixMe[missing-local-annot]
       const listener = event => {
         if (
           event.source !== window ||
diff --git a/packages/react-devtools-inline/src/backend.js b/packages/react-devtools-inline/src/backend.js
index 97d2368ac1696..659b6c8521c95 100644
--- a/packages/react-devtools-inline/src/backend.js
+++ b/packages/react-devtools-inline/src/backend.js
@@ -10,6 +10,7 @@ import type {BackendBridge} from 'react-devtools-shared/src/bridge';
 import type {Wall} from 'react-devtools-shared/src/types';
 
 function startActivation(contentWindow: any, bridge: BackendBridge) {
+  // $FlowFixMe[missing-local-annot]
   const onSavedPreferences = data => {
     // This is the only message we're listening for,
     // so it's safe to cleanup after we've received it.
@@ -96,6 +97,7 @@ export function createBridge(contentWindow: any, wall?: Wall): BackendBridge {
   if (wall == null) {
     wall = {
       listen(fn) {
+        // $FlowFixMe[missing-local-annot]
         const onMessage = ({data}) => {
           fn(data);
         };
diff --git a/packages/react-devtools-inline/src/frontend.js b/packages/react-devtools-inline/src/frontend.js
index 272fbba0b9265..018ce76c5df25 100644
--- a/packages/react-devtools-inline/src/frontend.js
+++ b/packages/react-devtools-inline/src/frontend.js
@@ -37,6 +37,7 @@ export function createBridge(contentWindow: any, wall?: Wall): FrontendBridge {
   if (wall == null) {
     wall = {
       listen(fn) {
+        // $FlowFixMe[missing-local-annot]
         const onMessage = ({data}) => {
           fn(data);
         };
diff --git a/packages/react-devtools-shared/src/backend/console.js b/packages/react-devtools-shared/src/backend/console.js
index 5753d910eba1d..61ead6d7c478d 100644
--- a/packages/react-devtools-shared/src/backend/console.js
+++ b/packages/react-devtools-shared/src/backend/console.js
@@ -197,6 +197,7 @@ export function patch({
           ? targetConsole[method].__REACT_DEVTOOLS_ORIGINAL_METHOD__
           : targetConsole[method]);
 
+        // $FlowFixMe[missing-local-annot]
         const overrideMethod = (...args) => {
           let shouldAppendWarningStack = false;
           if (method !== 'log') {
@@ -335,6 +336,7 @@ export function patchForStrictMode() {
           ? targetConsole[method].__REACT_DEVTOOLS_STRICT_MODE_ORIGINAL_METHOD__
           : targetConsole[method]);
 
+        // $FlowFixMe[missing-local-annot]
         const overrideMethod = (...args) => {
           if (!consoleSettingsRef.hideConsoleLogsInStrictMode) {
             // Dim the text color of the double logs if we're not
diff --git a/packages/react-devtools-shared/src/devtools/ContextMenu/ContextMenu.js b/packages/react-devtools-shared/src/devtools/ContextMenu/ContextMenu.js
index 43556f9dc6cce..3b4d2b6964965 100644
--- a/packages/react-devtools-shared/src/devtools/ContextMenu/ContextMenu.js
+++ b/packages/react-devtools-shared/src/devtools/ContextMenu/ContextMenu.js
@@ -104,6 +104,7 @@ export default function ContextMenu({children, id}: Props): React.Node {
     const menu = ((menuRef.current: any): HTMLElement);
     const container = containerRef.current;
     if (container !== null) {
+      // $FlowFixMe[missing-local-annot]
       const hideUnlessContains = event => {
         if (!menu.contains(event.target)) {
           hideMenu();
diff --git a/packages/react-devtools-shared/src/devtools/views/Components/Components.js b/packages/react-devtools-shared/src/devtools/views/Components/Components.js
index 9535e598174d3..ba2e99cf34393 100644
--- a/packages/react-devtools-shared/src/devtools/views/Components/Components.js
+++ b/packages/react-devtools-shared/src/devtools/views/Components/Components.js
@@ -100,6 +100,7 @@ function Components(_: {}) {
     onResizeEnd = () =>
       dispatch({type: 'ACTION_SET_IS_RESIZING', payload: false});
 
+    // $FlowFixMe[missing-local-annot]
     onResize = event => {
       const resizeElement = resizeElementRef.current;
       const wrapperElement = wrapperElementRef.current;
diff --git a/packages/react-devtools-shared/src/devtools/views/Components/EditableValue.js b/packages/react-devtools-shared/src/devtools/views/Components/EditableValue.js
index 03fe9d7bf7fb2..0511a388a574a 100644
--- a/packages/react-devtools-shared/src/devtools/views/Components/EditableValue.js
+++ b/packages/react-devtools-shared/src/devtools/views/Components/EditableValue.js
@@ -36,6 +36,7 @@ export default function EditableValue({
       externalValue: value,
     });
 
+  // $FlowFixMe[missing-local-annot]
   const handleChange = ({target}) =>
     dispatch({
       type: 'UPDATE',
@@ -43,6 +44,7 @@ export default function EditableValue({
       externalValue: value,
     });
 
+  // $FlowFixMe[missing-local-annot]
   const handleCheckBoxToggle = ({target}) => {
     dispatch({
       type: 'UPDATE',
@@ -58,6 +60,7 @@ export default function EditableValue({
     overrideValue(path, target.checked);
   };
 
+  // $FlowFixMe[missing-local-annot]
   const handleKeyDown = event => {
     // Prevent keydown events from e.g. change selected element in the tree
     event.stopPropagation();
diff --git a/packages/react-devtools-shared/src/devtools/views/Components/Element.js b/packages/react-devtools-shared/src/devtools/views/Components/Element.js
index bb850398df32e..c43164b511039 100644
--- a/packages/react-devtools-shared/src/devtools/views/Components/Element.js
+++ b/packages/react-devtools-shared/src/devtools/views/Components/Element.js
@@ -75,6 +75,7 @@ export default function Element({data, index, style}: Props): React.Node {
     }
   };
 
+  // $FlowFixMe[missing-local-annot]
   const handleClick = ({metaKey}) => {
     if (id !== null) {
       logEvent({
@@ -99,6 +100,7 @@ export default function Element({data, index, style}: Props): React.Node {
     setIsHovered(false);
   };
 
+  // $FlowFixMe[missing-local-annot]
   const handleKeyDoubleClick = event => {
     // Double clicks on key value are used for text selection (if the text has been truncated).
     // They should not enter the owners tree view.
@@ -220,6 +222,7 @@ export default function Element({data, index, style}: Props): React.Node {
 }
 
 // Prevent double clicks on toggle from drilling into the owner list.
+// $FlowFixMe[missing-local-annot]
 const swallowDoubleClick = event => {
   event.preventDefault();
   event.stopPropagation();
@@ -233,6 +236,7 @@ type ExpandCollapseToggleProps = {
 function ExpandCollapseToggle({element, store}: ExpandCollapseToggleProps) {
   const {children, id, isCollapsed} = element;
 
+  // $FlowFixMe[missing-local-annot]
   const toggleCollapsed = event => {
     event.preventDefault();
     event.stopPropagation();
@@ -240,6 +244,7 @@ function ExpandCollapseToggle({element, store}: ExpandCollapseToggleProps) {
     store.toggleIsCollapsed(id, !isCollapsed);
   };
 
+  // $FlowFixMe[missing-local-annot]
   const stopPropagation = event => {
     // Prevent the row from selecting
     event.stopPropagation();
diff --git a/packages/react-devtools-shared/src/devtools/views/Components/InspectedElementContextTree.js b/packages/react-devtools-shared/src/devtools/views/Components/InspectedElementContextTree.js
index f04a0fd8e067b..eb74c244d9d1a 100644
--- a/packages/react-devtools-shared/src/devtools/views/Components/InspectedElementContextTree.js
+++ b/packages/react-devtools-shared/src/devtools/views/Components/InspectedElementContextTree.js
@@ -53,6 +53,7 @@ export default function InspectedElementContextTree({
   // We add an object with a "value" key as a wrapper around Context data
   // so that we can use the shared <KeyValue> component to display it.
   // This wrapper object can't be renamed.
+  // $FlowFixMe[missing-local-annot]
   const canRenamePathsAtDepth = depth => depth > 1;
 
   if (isEmpty) {
diff --git a/packages/react-devtools-shared/src/devtools/views/Components/InspectedElementHooksTree.js b/packages/react-devtools-shared/src/devtools/views/Components/InspectedElementHooksTree.js
index f97a27c372a4c..6744cf4bc6477 100644
--- a/packages/react-devtools-shared/src/devtools/views/Components/InspectedElementHooksTree.js
+++ b/packages/react-devtools-shared/src/devtools/views/Components/InspectedElementHooksTree.js
@@ -223,6 +223,7 @@ function HookView({
 
   // Certain hooks are not editable at all (as identified by react-debug-tools).
   // Primitive hook names (e.g. the "State" name for useState) are also never editable.
+  // $FlowFixMe[missing-local-annot]
   const canRenamePathsAtDepth = depth => isStateEditable && depth > 1;
 
   const isCustomHook = subHooks.length > 0;
diff --git a/packages/react-devtools-shared/src/devtools/views/Components/KeyValue.js b/packages/react-devtools-shared/src/devtools/views/Components/KeyValue.js
index c9240034dc5cd..ca2f623c1a4c1 100644
--- a/packages/react-devtools-shared/src/devtools/views/Components/KeyValue.js
+++ b/packages/react-devtools-shared/src/devtools/views/Components/KeyValue.js
@@ -480,7 +480,9 @@ export default function KeyValue({
   return children;
 }
 
+// $FlowFixMe[missing-local-annot]
 function DeleteToggle({deletePath, name, path}) {
+  // $FlowFixMe[missing-local-annot]
   const handleClick = event => {
     event.stopPropagation();
     deletePath(path);
diff --git a/packages/react-devtools-shared/src/devtools/views/Components/NativeStyleEditor/AutoSizeInput.js b/packages/react-devtools-shared/src/devtools/views/Components/NativeStyleEditor/AutoSizeInput.js
index 057dd4625f2c3..059cb42273f44 100644
--- a/packages/react-devtools-shared/src/devtools/views/Components/NativeStyleEditor/AutoSizeInput.js
+++ b/packages/react-devtools-shared/src/devtools/views/Components/NativeStyleEditor/AutoSizeInput.js
@@ -27,6 +27,7 @@ export default function AutoSizeInput({
   value,
   ...rest
 }: Props): React.Node {
+  // $FlowFixMe[missing-local-annot]
   const onFocusWrapper = event => {
     const input = event.target;
     if (input !== null) {
diff --git a/packages/react-devtools-shared/src/devtools/views/Components/NativeStyleEditor/StyleEditor.js b/packages/react-devtools-shared/src/devtools/views/Components/NativeStyleEditor/StyleEditor.js
index 7b85633f214a8..5b7cdf8563412 100644
--- a/packages/react-devtools-shared/src/devtools/views/Components/NativeStyleEditor/StyleEditor.js
+++ b/packages/react-devtools-shared/src/devtools/views/Components/NativeStyleEditor/StyleEditor.js
@@ -171,6 +171,7 @@ function Row({
   const [isAttributeValid, setIsAttributeValid] = useState(true);
   const [isValueValid, setIsValueValid] = useState(true);
 
+  // $FlowFixMe[missing-local-annot]
   const validateAndSetLocalAttribute = newAttribute => {
     const isValid =
       newAttribute === '' ||
@@ -183,6 +184,7 @@ function Row({
     });
   };
 
+  // $FlowFixMe[missing-local-annot]
   const validateAndSetLocalValue = newValue => {
     let isValid = false;
     try {
@@ -262,6 +264,7 @@ function Field({
   placeholder,
   value,
 }: FieldProps) {
+  // $FlowFixMe[missing-local-annot]
   const onKeyDown = event => {
     switch (event.key) {
       case 'Enter':
diff --git a/packages/react-devtools-shared/src/devtools/views/Components/NewArrayValue.js b/packages/react-devtools-shared/src/devtools/views/Components/NewArrayValue.js
index 5a9fffed5ca4e..c8247f7449623 100644
--- a/packages/react-devtools-shared/src/devtools/views/Components/NewArrayValue.js
+++ b/packages/react-devtools-shared/src/devtools/views/Components/NewArrayValue.js
@@ -46,6 +46,7 @@ export default function NewArrayValue({
 
   // This is a bit of an unusual usage of the EditableName component,
   // but otherwise it acts the way we want for a new Array entry.
+  // $FlowFixMe[missing-local-annot]
   const overrideName = (oldPath: any, newPath) => {
     const value = newPath[newPath.length - 1];
 
diff --git a/packages/react-devtools-shared/src/devtools/views/Components/NewKeyValue.js b/packages/react-devtools-shared/src/devtools/views/Components/NewKeyValue.js
index 9a354a81adb5d..8fb4cc1dc8ca9 100644
--- a/packages/react-devtools-shared/src/devtools/views/Components/NewKeyValue.js
+++ b/packages/react-devtools-shared/src/devtools/views/Components/NewKeyValue.js
@@ -42,6 +42,7 @@ export default function NewKeyValue({
   const [newPropKey, setNewPropKey] = useState<number>(0);
   const [newPropName, setNewPropName] = useState<string>('');
 
+  // $FlowFixMe[missing-local-annot]
   const overrideNewEntryName = (oldPath: any, newPath) => {
     setNewPropName(newPath[newPath.length - 1]);
   };
diff --git a/packages/react-devtools-shared/src/devtools/views/Components/Tree.js b/packages/react-devtools-shared/src/devtools/views/Components/Tree.js
index 60cbddb60dae0..7374e4d70ff32 100644
--- a/packages/react-devtools-shared/src/devtools/views/Components/Tree.js
+++ b/packages/react-devtools-shared/src/devtools/views/Components/Tree.js
@@ -540,6 +540,7 @@ function updateIndentationSizeVar(
   list.style.setProperty('--indentation-size', `${maxIndentationSize}px`);
 }
 
+// $FlowFixMe[missing-local-annot]
 function InnerElementType({children, style, ...rest}) {
   const {ownerID} = useContext(TreeStateContext);
 
diff --git a/packages/react-devtools-shared/src/devtools/views/Profiler/SidebarSelectedFiberInfo.js b/packages/react-devtools-shared/src/devtools/views/Profiler/SidebarSelectedFiberInfo.js
index bfdb4a6e31684..930183ee0cc65 100644
--- a/packages/react-devtools-shared/src/devtools/views/Profiler/SidebarSelectedFiberInfo.js
+++ b/packages/react-devtools-shared/src/devtools/views/Profiler/SidebarSelectedFiberInfo.js
@@ -38,6 +38,7 @@ export default function SidebarSelectedFiberInfo(_: Props): React.Node {
     rootID: ((rootID: any): number),
   });
 
+  // $FlowFixMe[missing-local-annot]
   const handleKeyDown = event => {
     switch (event.key) {
       case 'ArrowUp':
diff --git a/packages/react-devtools-shared/src/devtools/views/Profiler/SnapshotSelector.js b/packages/react-devtools-shared/src/devtools/views/Profiler/SnapshotSelector.js
index 052c0c100c648..57b26ce15fa3d 100644
--- a/packages/react-devtools-shared/src/devtools/views/Profiler/SnapshotSelector.js
+++ b/packages/react-devtools-shared/src/devtools/views/Profiler/SnapshotSelector.js
@@ -86,6 +86,7 @@ export default function SnapshotSelector(_: Props): React.Node {
 
   let label = null;
   if (numFilteredCommits > 0) {
+    // $FlowFixMe[missing-local-annot]
     const handleCommitInputChange = event => {
       const value = parseInt(event.currentTarget.value, 10);
       if (!isNaN(value)) {
@@ -100,10 +101,12 @@ export default function SnapshotSelector(_: Props): React.Node {
       }
     };
 
+    // $FlowFixMe[missing-local-annot]
     const handleClick = event => {
       event.currentTarget.select();
     };
 
+    // $FlowFixMe[missing-local-annot]
     const handleKeyDown = event => {
       switch (event.key) {
         case 'ArrowDown':
@@ -159,6 +162,7 @@ export default function SnapshotSelector(_: Props): React.Node {
     selectCommitIndex(filteredCommitIndices[nextCommitIndex]);
   };
 
+  // $FlowFixMe[missing-local-annot]
   const handleKeyDown = event => {
     switch (event.key) {
       case 'ArrowLeft':
diff --git a/packages/react-devtools-shared/src/devtools/views/SearchInput.js b/packages/react-devtools-shared/src/devtools/views/SearchInput.js
index 2569b685536ec..8a43202f87c30 100644
--- a/packages/react-devtools-shared/src/devtools/views/SearchInput.js
+++ b/packages/react-devtools-shared/src/devtools/views/SearchInput.js
@@ -40,9 +40,11 @@ export default function SearchInput({
 
   const resetSearch = () => search('');
 
+  // $FlowFixMe[missing-local-annot]
   const handleChange = ({currentTarget}) => {
     search(currentTarget.value);
   };
+  // $FlowFixMe[missing-local-annot]
   const handleKeyPress = ({key, shiftKey}) => {
     if (key === 'Enter') {
       if (shiftKey) {
diff --git a/packages/react-devtools-shared/src/devtools/views/hooks.js b/packages/react-devtools-shared/src/devtools/views/hooks.js
index 795532a45f6c0..c5ee3a3e83d7a 100644
--- a/packages/react-devtools-shared/src/devtools/views/hooks.js
+++ b/packages/react-devtools-shared/src/devtools/views/hooks.js
@@ -191,6 +191,7 @@ export function useLocalStorage<T>(
   // Listen for changes to this local storage value made from other windows.
   // This enables the e.g. "⚛️ Elements" tab to update in response to changes from "⚛️ Settings".
   useLayoutEffect(() => {
+    // $FlowFixMe[missing-local-annot]
     const onStorage = event => {
       const newValue = getValueFromLocalStorage();
       if (key === event.key && storedValue !== newValue) {
diff --git a/packages/react-devtools-shell/src/app/EditableProps/index.js b/packages/react-devtools-shell/src/app/EditableProps/index.js
index 5c780ee86e72e..5cfad3f7e837f 100644
--- a/packages/react-devtools-shell/src/app/EditableProps/index.js
+++ b/packages/react-devtools-shell/src/app/EditableProps/index.js
@@ -24,6 +24,7 @@ import {
 
 const initialData = {foo: 'FOO', bar: 'BAR'};
 
+// $FlowFixMe[missing-local-annot]
 function reducer(state, action: {type: string}) {
   switch (action.type) {
     case 'swap':
@@ -80,6 +81,7 @@ class StatefulClass extends Component<Props, State> {
     state: 'California',
   };
 
+  // $FlowFixMe[missing-local-annot]
   handleChange = ({target}): any =>
     this.setState({
       state: target.value,
diff --git a/packages/react-devtools-shell/src/app/ErrorBoundaries/index.js b/packages/react-devtools-shell/src/app/ErrorBoundaries/index.js
index 234ffb642fcc6..a87d853ea1b25 100644
--- a/packages/react-devtools-shell/src/app/ErrorBoundaries/index.js
+++ b/packages/react-devtools-shell/src/app/ErrorBoundaries/index.js
@@ -49,6 +49,7 @@ class ErrorBoundary extends React.Component {
   }
 }
 
+// $FlowFixMe[missing-local-annot]
 function Component({label}) {
   return <div>{label}</div>;
 }
diff --git a/packages/react-devtools-shell/src/app/Iframe/index.js b/packages/react-devtools-shell/src/app/Iframe/index.js
index 50beadd137aa2..99eafee6b29b7 100644
--- a/packages/react-devtools-shell/src/app/Iframe/index.js
+++ b/packages/react-devtools-shell/src/app/Iframe/index.js
@@ -19,6 +19,7 @@ export default function Iframe(): React.Node {
 
 const iframeStyle = {border: '2px solid #eee', height: 80};
 
+// $FlowFixMe[missing-local-annot]
 function Frame(props) {
   const [element, setElement] = React.useState(null);
 
diff --git a/packages/react-devtools-shell/src/app/InlineWarnings/index.js b/packages/react-devtools-shell/src/app/InlineWarnings/index.js
index 6b7b189f70174..ddfac6acb4c3b 100644
--- a/packages/react-devtools-shell/src/app/InlineWarnings/index.js
+++ b/packages/react-devtools-shell/src/app/InlineWarnings/index.js
@@ -3,11 +3,13 @@
 import * as React from 'react';
 import {Fragment, useEffect, useRef, useState} from 'react';
 
+// $FlowFixMe[missing-local-annot]
 function WarnDuringRender({children = null}) {
   console.warn('This warning fires during every render');
   return children;
 }
 
+// $FlowFixMe[missing-local-annot]
 function WarnOnMount({children = null}) {
   useEffect(() => {
     console.warn('This warning fires on initial mount only');
@@ -15,6 +17,7 @@ function WarnOnMount({children = null}) {
   return children;
 }
 
+// $FlowFixMe[missing-local-annot]
 function WarnOnUpdate({children = null}) {
   const didMountRef = useRef(false);
   useEffect(() => {
@@ -27,6 +30,7 @@ function WarnOnUpdate({children = null}) {
   return children;
 }
 
+// $FlowFixMe[missing-local-annot]
 function WarnOnUnmount({children = null}) {
   useEffect(() => {
     return () => {
@@ -36,11 +40,13 @@ function WarnOnUnmount({children = null}) {
   return children;
 }
 
+// $FlowFixMe[missing-local-annot]
 function ErrorDuringRender({children = null}) {
   console.error('This error fires during every render');
   return children;
 }
 
+// $FlowFixMe[missing-local-annot]
 function ErrorOnMount({children = null}) {
   useEffect(() => {
     console.error('This error fires on initial mount only');
@@ -48,6 +54,7 @@ function ErrorOnMount({children = null}) {
   return children;
 }
 
+// $FlowFixMe[missing-local-annot]
 function ErrorOnUpdate({children = null}) {
   const didMountRef = useRef(false);
   useEffect(() => {
@@ -60,6 +67,7 @@ function ErrorOnUpdate({children = null}) {
   return children;
 }
 
+// $FlowFixMe[missing-local-annot]
 function ErrorOnUnmount({children = null}) {
   useEffect(() => {
     return () => {
@@ -69,12 +77,14 @@ function ErrorOnUnmount({children = null}) {
   return children;
 }
 
+// $FlowFixMe[missing-local-annot]
 function ErrorAndWarningDuringRender({children = null}) {
   console.warn('This warning fires during every render');
   console.error('This error fires during every render');
   return children;
 }
 
+// $FlowFixMe[missing-local-annot]
 function ErrorAndWarningOnMount({children = null}) {
   useEffect(() => {
     console.warn('This warning fires on initial mount only');
@@ -83,6 +93,7 @@ function ErrorAndWarningOnMount({children = null}) {
   return children;
 }
 
+// $FlowFixMe[missing-local-annot]
 function ErrorAndWarningOnUpdate({children = null}) {
   const didMountRef = useRef(false);
   useEffect(() => {
@@ -96,6 +107,7 @@ function ErrorAndWarningOnUpdate({children = null}) {
   return children;
 }
 
+// $FlowFixMe[missing-local-annot]
 function ErrorAndWarningOnUnmount({children = null}) {
   useEffect(() => {
     return () => {
@@ -106,6 +118,7 @@ function ErrorAndWarningOnUnmount({children = null}) {
   return children;
 }
 
+// $FlowFixMe[missing-local-annot]
 function ReallyLongErrorMessageThatWillCauseTextToBeTruncated({
   children = null,
 }) {
@@ -115,20 +128,24 @@ function ReallyLongErrorMessageThatWillCauseTextToBeTruncated({
   return children;
 }
 
+// $FlowFixMe[missing-local-annot]
 function ErrorWithMultipleArgs({children = null}) {
   console.error('This error', 'passes console', 4, 'arguments');
   return children;
 }
 
+// $FlowFixMe[missing-local-annot]
 function ErrorWithStringSubstitutions({children = null}) {
   console.error('This error uses "%s" substitutions', 'string');
   return children;
 }
 
+// $FlowFixMe[missing-local-annot]
 function ReactErrorOnHostComponent({children = null}) {
   return <div data-camelCasedAttribute="should-lower-case">{children}</div>;
 }
 
+// $FlowFixMe[missing-local-annot]
 function DuplicateWarningsAndErrors({children = null}) {
   console.warn('this warning is logged twice per render');
   console.warn('this warning is logged twice per render');
@@ -137,6 +154,7 @@ function DuplicateWarningsAndErrors({children = null}) {
   return <div data-camelCasedAttribute="should-lower-case">{children}</div>;
 }
 
+// $FlowFixMe[missing-local-annot]
 function MultipleWarningsAndErrors({children = null}) {
   console.warn('this is the first warning logged');
   console.warn('this is the second warning logged');
@@ -145,6 +163,7 @@ function MultipleWarningsAndErrors({children = null}) {
   return <div data-camelCasedAttribute="should-lower-case">{children}</div>;
 }
 
+// $FlowFixMe[missing-local-annot]
 function ComponentWithMissingKey({children}) {
   return [<div />];
 }
diff --git a/packages/react-devtools-shell/src/app/InspectableElements/Contexts.js b/packages/react-devtools-shell/src/app/InspectableElements/Contexts.js
index 0cafb31390f1e..fc76fc11c5476 100644
--- a/packages/react-devtools-shell/src/app/InspectableElements/Contexts.js
+++ b/packages/react-devtools-shell/src/app/InspectableElements/Contexts.js
@@ -115,6 +115,7 @@ class LegacyContextProviderWithUpdates extends Component<any> {
     return {type: this.state.type};
   }
 
+  // $FlowFixMe[missing-local-annot]
   handleChange = event => {
     this.setState({type: event.target.value});
   };
@@ -135,6 +136,7 @@ LegacyContextProviderWithUpdates.childContextTypes = {
   type: PropTypes.string,
 };
 
+// $FlowFixMe[missing-local-annot]
 function LegacyFunctionalContextConsumer(props: any, context) {
   return formatContextForDisplay('LegacyFunctionContextConsumer', context.type);
 }
@@ -203,7 +205,9 @@ function FunctionalContextConsumerWithContextUpdates() {
   const {string2, setString2} = useContext(StringContextWithUpdates2);
   const [state, setState] = useState('state');
 
+  // $FlowFixMe[missing-local-annot]
   const handleChange = e => setString(e.target.value);
+  // $FlowFixMe[missing-local-annot]
   const handleChange2 = e => setString2(e.target.value);
 
   return (
diff --git a/packages/react-devtools-shell/src/app/SuspenseTree/index.js b/packages/react-devtools-shell/src/app/SuspenseTree/index.js
index c262846b48b8f..e5b46bc7c8904 100644
--- a/packages/react-devtools-shell/src/app/SuspenseTree/index.js
+++ b/packages/react-devtools-shell/src/app/SuspenseTree/index.js
@@ -29,6 +29,7 @@ function EmptySuspense() {
   return <Suspense />;
 }
 
+// $FlowFixMe[missing-local-annot]
 function PrimaryFallbackTest({initialSuspend}) {
   const [suspend, setSuspend] = useState(initialSuspend);
   const fallbackStep = useTestSequence('fallback', Fallback1, Fallback2);
diff --git a/packages/react-devtools-shell/src/app/index.js b/packages/react-devtools-shell/src/app/index.js
index 0045e81f139cd..6568fa7d3f019 100644
--- a/packages/react-devtools-shell/src/app/index.js
+++ b/packages/react-devtools-shell/src/app/index.js
@@ -52,6 +52,7 @@ function mountApp(App: () => React$Node) {
   unmountFunctions.push(() => root.unmount());
 }
 
+// $FlowFixMe[missing-local-annot]
 function mountStrictApp(App) {
   function StrictRoot() {
     return createElement(App);
diff --git a/packages/react-devtools-shell/src/e2e-apps/ListApp.js b/packages/react-devtools-shell/src/e2e-apps/ListApp.js
index f365686ad139b..9cb17188b0ffd 100644
--- a/packages/react-devtools-shell/src/e2e-apps/ListApp.js
+++ b/packages/react-devtools-shell/src/e2e-apps/ListApp.js
@@ -43,6 +43,7 @@ function List() {
   );
 }
 
+// $FlowFixMe[missing-local-annot]
 function ListItem({label}) {
   return <li data-testname="ListItem">{label}</li>;
 }
diff --git a/packages/react-devtools-shell/src/e2e-apps/ListAppLegacy.js b/packages/react-devtools-shell/src/e2e-apps/ListAppLegacy.js
index 98e15d2f6501b..056bd7b2243be 100644
--- a/packages/react-devtools-shell/src/e2e-apps/ListAppLegacy.js
+++ b/packages/react-devtools-shell/src/e2e-apps/ListAppLegacy.js
@@ -50,6 +50,7 @@ class List extends React.Component {
   }
 }
 
+// $FlowFixMe[missing-local-annot]
 function ListItem({label}) {
   return <li data-testname="ListItem">{label}</li>;
 }
diff --git a/packages/react-devtools-timeline/src/Timeline.js b/packages/react-devtools-timeline/src/Timeline.js
index 5ed6a0f7443f8..492725e17aa97 100644
--- a/packages/react-devtools-timeline/src/Timeline.js
+++ b/packages/react-devtools-timeline/src/Timeline.js
@@ -117,6 +117,7 @@ const ProcessingData = () => (
   </div>
 );
 
+// $FlowFixMe[missing-local-annot]
 const CouldNotLoadProfile = ({error, onFileSelect}) => (
   <div className={styles.EmptyStateContainer}>
     <div className={styles.Header}>Could not load profile</div>
diff --git a/packages/react-dom-bindings/src/client/inputValueTracking.js b/packages/react-dom-bindings/src/client/inputValueTracking.js
index e1e45a13a54f8..5d2e8d9f96b09 100644
--- a/packages/react-dom-bindings/src/client/inputValueTracking.js
+++ b/packages/react-dom-bindings/src/client/inputValueTracking.js
@@ -81,6 +81,7 @@ function trackValueOnNode(node: any): ?ValueTracker {
     get: function(this: any) {
       return get.call(this);
     },
+    // $FlowFixMe[missing-local-annot]
     set: function(this: any, value) {
       if (__DEV__) {
         checkFormFieldValueStringCoercion(value);
diff --git a/packages/react-dom-bindings/src/events/SyntheticEvent.js b/packages/react-dom-bindings/src/events/SyntheticEvent.js
index 82758b565b0fe..953c9110b72e8 100644
--- a/packages/react-dom-bindings/src/events/SyntheticEvent.js
+++ b/packages/react-dom-bindings/src/events/SyntheticEvent.js
@@ -423,6 +423,7 @@ const modifierKeyToProp = {
 // Older browsers (Safari <= 10, iOS Safari <= 10.2) do not support
 // getModifierState. If getModifierState is not supported, we map it to a set of
 // modifier keys exposed by the event. In this case, Lock-keys are not supported.
+// $FlowFixMe[missing-local-annot]
 function modifierStateGetter(this: any, keyArg) {
   const syntheticEvent = this;
   const nativeEvent = syntheticEvent.nativeEvent;
diff --git a/packages/react-dom-bindings/src/events/plugins/ChangeEventPlugin.js b/packages/react-dom-bindings/src/events/plugins/ChangeEventPlugin.js
index 3b57d4ec05148..cbfc872770d28 100644
--- a/packages/react-dom-bindings/src/events/plugins/ChangeEventPlugin.js
+++ b/packages/react-dom-bindings/src/events/plugins/ChangeEventPlugin.js
@@ -51,6 +51,7 @@ function registerEvents() {
 }
 
 function createAndAccumulateChangeEvent(
+  // $FlowFixMe[missing-local-annot]
   dispatchQueue,
   inst: null | Fiber,
   nativeEvent: AnyNativeEvent,
@@ -173,6 +174,7 @@ function stopWatchingForValueChange() {
  * (For IE <=9) Handles a propertychange event, sending a `change` event if
  * the value of the active element has changed.
  */
+// $FlowFixMe[missing-local-annot]
 function handlePropertyChange(nativeEvent) {
   if (nativeEvent.propertyName !== 'value') {
     return;
diff --git a/packages/react-dom-bindings/src/server/ReactDOMServerFormatConfig.js b/packages/react-dom-bindings/src/server/ReactDOMServerFormatConfig.js
index d9c16f776723c..843c4bee1ff6d 100644
--- a/packages/react-dom-bindings/src/server/ReactDOMServerFormatConfig.js
+++ b/packages/react-dom-bindings/src/server/ReactDOMServerFormatConfig.js
@@ -2769,6 +2769,7 @@ export function writeInitialResources(
     const {src, integrity} = responseState.externalRuntimeConfig;
     preinitImpl(resources, src, {as: 'script', integrity});
   }
+  // $FlowFixMe[missing-local-annot]
   function flushLinkResource(resource) {
     if (!resource.flushed) {
       pushLinkImpl(target, resource.props, responseState);
@@ -2893,6 +2894,7 @@ export function writeImmediateResources(
   resources: Resources,
   responseState: ResponseState,
 ): boolean {
+  // $FlowFixMe[missing-local-annot]
   function flushLinkResource(resource) {
     if (!resource.flushed) {
       pushLinkImpl(target, resource.props, responseState);
diff --git a/packages/react-dom/src/server/ReactDOMLegacyServerImpl.js b/packages/react-dom/src/server/ReactDOMLegacyServerImpl.js
index 9563adfeec6bd..2d9fed4a556f1 100644
--- a/packages/react-dom/src/server/ReactDOMLegacyServerImpl.js
+++ b/packages/react-dom/src/server/ReactDOMLegacyServerImpl.js
@@ -43,12 +43,14 @@ function renderToStringImpl(
   let fatalError = null;
   let result = '';
   const destination = {
+    // $FlowFixMe[missing-local-annot]
     push(chunk) {
       if (chunk !== null) {
         result += chunk;
       }
       return true;
     },
+    // $FlowFixMe[missing-local-annot]
     destroy(error) {
       didFatal = true;
       fatalError = error;
diff --git a/packages/react-dom/src/server/ReactDOMLegacyServerNodeStream.js b/packages/react-dom/src/server/ReactDOMLegacyServerNodeStream.js
index e0726fa79eb03..167d6cc1e1147 100644
--- a/packages/react-dom/src/server/ReactDOMLegacyServerNodeStream.js
+++ b/packages/react-dom/src/server/ReactDOMLegacyServerNodeStream.js
@@ -40,12 +40,14 @@ class ReactMarkupReadableStream extends Readable {
     this.startedFlowing = false;
   }
 
+  // $FlowFixMe[missing-local-annot]
   _destroy(err, callback) {
     abort(this.request);
     // $FlowFixMe: The type definition for the callback should allow undefined and null.
     callback(err);
   }
 
+  // $FlowFixMe[missing-local-annot]
   _read(size) {
     if (this.startedFlowing) {
       startFlowing(this.request, this);
diff --git a/packages/react-interactions/events/src/dom/create-event-handle/Focus.js b/packages/react-interactions/events/src/dom/create-event-handle/Focus.js
index 16ce67848cf87..58b4eb44f5092 100644
--- a/packages/react-interactions/events/src/dom/create-event-handle/Focus.js
+++ b/packages/react-interactions/events/src/dom/create-event-handle/Focus.js
@@ -125,6 +125,7 @@ function isRelatedTargetWithin(
 }
 
 function setFocusVisibleListeners(
+  // $FlowFixMe[missing-local-annot]
   focusVisibleHandles,
   focusTarget: EventTarget,
   callback: boolean => void,
diff --git a/packages/react-native-renderer/src/ReactFabric.js b/packages/react-native-renderer/src/ReactFabric.js
index 4ec730a3f9a5e..bcd04fb7596b3 100644
--- a/packages/react-native-renderer/src/ReactFabric.js
+++ b/packages/react-native-renderer/src/ReactFabric.js
@@ -201,6 +201,7 @@ function sendAccessibilityEvent(handle: any, eventType: string) {
   }
 }
 
+// $FlowFixMe[missing-local-annot]
 function onRecoverableError(error) {
   // TODO: Expose onRecoverableError option to userspace
   // eslint-disable-next-line react-internal/no-production-logging, react-internal/warning-args
@@ -236,6 +237,7 @@ function render(
   return getPublicRootInstance(root);
 }
 
+// $FlowFixMe[missing-this-annot]
 function unmountComponentAtNode(containerTag: number) {
   this.stopSurface(containerTag);
 }
diff --git a/packages/react-native-renderer/src/ReactFabricHostConfig.js b/packages/react-native-renderer/src/ReactFabricHostConfig.js
index ec6918e96d346..7f98be1c9f37b 100644
--- a/packages/react-native-renderer/src/ReactFabricHostConfig.js
+++ b/packages/react-native-renderer/src/ReactFabricHostConfig.js
@@ -244,6 +244,7 @@ class ReactFabricHostComponent {
     eventType: string,
     listener: EventListener,
     options: EventListenerOptions | boolean,
+    // $FlowFixMe[missing-local-annot]
   ) {
     if (typeof eventType !== 'string') {
       throw new Error('addEventListener_unstable eventType must be a string');
diff --git a/packages/react-native-renderer/src/ReactNativeBridgeEventPlugin.js b/packages/react-native-renderer/src/ReactNativeBridgeEventPlugin.js
index 618cdce27b644..3e7a3a91adf5f 100644
--- a/packages/react-native-renderer/src/ReactNativeBridgeEventPlugin.js
+++ b/packages/react-native-renderer/src/ReactNativeBridgeEventPlugin.js
@@ -31,12 +31,14 @@ const {
 // Start of inline: the below functions were inlined from
 // EventPropagator.js, as they deviated from ReactDOM's newer
 // implementations.
+// $FlowFixMe[missing-local-annot]
 function listenersAtPhase(inst, event, propagationPhase: PropagationPhases) {
   const registrationName =
     event.dispatchConfig.phasedRegistrationNames[propagationPhase];
   return getListeners(inst, registrationName, propagationPhase, true);
 }
 
+// $FlowFixMe[missing-local-annot]
 function accumulateListenersAndInstances(inst, event, listeners) {
   const listenersLength = listeners
     ? isArray(listeners)
@@ -64,6 +66,7 @@ function accumulateListenersAndInstances(inst, event, listeners) {
   }
 }
 
+// $FlowFixMe[missing-local-annot]
 function accumulateDirectionalDispatches(inst, phase, event) {
   if (__DEV__) {
     if (!inst) {
@@ -74,6 +77,7 @@ function accumulateDirectionalDispatches(inst, phase, event) {
   accumulateListenersAndInstances(inst, event, listeners);
 }
 
+// $FlowFixMe[missing-local-annot]
 function getParent(inst) {
   do {
     inst = inst.return;
@@ -117,6 +121,7 @@ export function traverseTwoPhase(
   }
 }
 
+// $FlowFixMe[missing-local-annot]
 function accumulateTwoPhaseDispatchesSingle(event) {
   if (event && event.dispatchConfig.phasedRegistrationNames) {
     traverseTwoPhase(
@@ -128,10 +133,12 @@ function accumulateTwoPhaseDispatchesSingle(event) {
   }
 }
 
+// $FlowFixMe[missing-local-annot]
 function accumulateTwoPhaseDispatches(events) {
   forEachAccumulated(events, accumulateTwoPhaseDispatchesSingle);
 }
 
+// $FlowFixMe[missing-local-annot]
 function accumulateCapturePhaseDispatches(event) {
   if (event && event.dispatchConfig.phasedRegistrationNames) {
     traverseTwoPhase(
diff --git a/packages/react-native-renderer/src/ReactNativeEventEmitter.js b/packages/react-native-renderer/src/ReactNativeEventEmitter.js
index aeb3e23cb0368..f4ed0f641623b 100644
--- a/packages/react-native-renderer/src/ReactNativeEventEmitter.js
+++ b/packages/react-native-renderer/src/ReactNativeEventEmitter.js
@@ -43,6 +43,7 @@ const EMPTY_NATIVE_EVENT = (({}: any): AnyNativeEvent);
  * @param {Array<number>} indices Indices by which to pull subsequence.
  * @return {Array<Touch>} Subsequence of touch objects.
  */
+// $FlowFixMe[missing-local-annot]
 const touchSubsequence = function(touches, indices) {
   const ret = [];
   for (let i = 0; i < indices.length; i++) {
diff --git a/packages/react-native-renderer/src/ReactNativeFiberInspector.js b/packages/react-native-renderer/src/ReactNativeFiberInspector.js
index 14545550647dd..01d71a2825cb4 100644
--- a/packages/react-native-renderer/src/ReactNativeFiberInspector.js
+++ b/packages/react-native-renderer/src/ReactNativeFiberInspector.js
@@ -39,6 +39,7 @@ let getOwnerHierarchy;
 let traverseOwnerTreeUp;
 
 if (__DEV__ || enableGetInspectorDataForInstanceInProduction) {
+  // $FlowFixMe[missing-local-annot]
   createHierarchy = function(fiberHierarchy) {
     return fiberHierarchy.map(fiber => ({
       name: getComponentNameFromType(fiber.type),
@@ -68,6 +69,7 @@ if (__DEV__ || enableGetInspectorDataForInstanceInProduction) {
     }));
   };
 
+  // $FlowFixMe[missing-local-annot]
   getHostNode = function(fiber: Fiber | null, findNodeHandle) {
     let hostNode;
     // look for children first for the hostNode
@@ -84,6 +86,7 @@ if (__DEV__ || enableGetInspectorDataForInstanceInProduction) {
     return null;
   };
 
+  // $FlowFixMe[missing-local-annot]
   getHostProps = function(fiber) {
     const host = findCurrentHostFiber(fiber);
     if (host) {
@@ -128,6 +131,7 @@ if (__DEV__ || enableGetInspectorDataForInstanceInProduction) {
     return hierarchy;
   };
 
+  // $FlowFixMe[missing-local-annot]
   lastNonHostInstance = function(hierarchy) {
     for (let i = hierarchy.length - 1; i > 1; i--) {
       const instance = hierarchy[i];
@@ -139,6 +143,7 @@ if (__DEV__ || enableGetInspectorDataForInstanceInProduction) {
     return hierarchy[0];
   };
 
+  // $FlowFixMe[missing-local-annot]
   traverseOwnerTreeUp = function(hierarchy, instance: any) {
     if (instance) {
       hierarchy.unshift(instance);
diff --git a/packages/react-native-renderer/src/ReactNativeGetListeners.js b/packages/react-native-renderer/src/ReactNativeGetListeners.js
index 3417f69b4a3c6..2f3520a1ceb22 100644
--- a/packages/react-native-renderer/src/ReactNativeGetListeners.js
+++ b/packages/react-native-renderer/src/ReactNativeGetListeners.js
@@ -117,6 +117,7 @@ export default function getListeners(
       // all imperative event listeners in a function to unwrap the SyntheticEvent
       // and pass them an Event.
       // When this API is more stable and used more frequently, we can revisit.
+      // $FlowFixMe[missing-local-annot]
       const listenerFnWrapper = function(syntheticEvent, ...args) {
         const eventInst = new CustomEvent(mangledImperativeRegistrationName, {
           detail: syntheticEvent.nativeEvent,
diff --git a/packages/react-native-renderer/src/ReactNativeRenderer.js b/packages/react-native-renderer/src/ReactNativeRenderer.js
index 85e8a1436a9f4..e07b8285a4d4a 100644
--- a/packages/react-native-renderer/src/ReactNativeRenderer.js
+++ b/packages/react-native-renderer/src/ReactNativeRenderer.js
@@ -198,6 +198,7 @@ function sendAccessibilityEvent(handle: any, eventType: string) {
   }
 }
 
+// $FlowFixMe[missing-local-annot]
 function onRecoverableError(error) {
   // TODO: Expose onRecoverableError option to userspace
   // eslint-disable-next-line react-internal/no-production-logging, react-internal/warning-args
diff --git a/packages/react-native-renderer/src/legacy-events/EventBatching.js b/packages/react-native-renderer/src/legacy-events/EventBatching.js
index 26bb977492811..ec98a86fb61df 100644
--- a/packages/react-native-renderer/src/legacy-events/EventBatching.js
+++ b/packages/react-native-renderer/src/legacy-events/EventBatching.js
@@ -34,6 +34,7 @@ const executeDispatchesAndRelease = function(event: ReactSyntheticEvent) {
     }
   }
 };
+// $FlowFixMe[missing-local-annot]
 const executeDispatchesAndReleaseTopLevel = function(e) {
   return executeDispatchesAndRelease(e);
 };
diff --git a/packages/react-reconciler/src/ReactFiberClassComponent.js b/packages/react-reconciler/src/ReactFiberClassComponent.js
index 5f39a1fd12295..2443db472ba1d 100644
--- a/packages/react-reconciler/src/ReactFiberClassComponent.js
+++ b/packages/react-reconciler/src/ReactFiberClassComponent.js
@@ -194,6 +194,7 @@ function applyDerivedStateFromProps(
 
 const classComponentUpdater = {
   isMounted,
+  // $FlowFixMe[missing-local-annot]
   enqueueSetState(inst: any, payload: any, callback) {
     const fiber = getInstance(inst);
     const eventTime = requestEventTime();
@@ -262,6 +263,7 @@ const classComponentUpdater = {
       markStateUpdateScheduled(fiber, lane);
     }
   },
+  // $FlowFixMe[missing-local-annot]
   enqueueForceUpdate(inst: any, callback) {
     const fiber = getInstance(inst);
     const eventTime = requestEventTime();
diff --git a/packages/react-reconciler/src/ReactFiberRoot.js b/packages/react-reconciler/src/ReactFiberRoot.js
index bfaf176a019ab..82f5655250084 100644
--- a/packages/react-reconciler/src/ReactFiberRoot.js
+++ b/packages/react-reconciler/src/ReactFiberRoot.js
@@ -47,6 +47,7 @@ export type RootState = {
 function FiberRootNode(
   this: $FlowFixMe,
   containerInfo: any,
+  // $FlowFixMe[missing-local-annot]
   tag,
   hydrate: any,
   identifierPrefix: any,
diff --git a/packages/react-reconciler/src/ReactFiberWorkLoop.js b/packages/react-reconciler/src/ReactFiberWorkLoop.js
index 692d0a9943db5..cd9f1498c655b 100644
--- a/packages/react-reconciler/src/ReactFiberWorkLoop.js
+++ b/packages/react-reconciler/src/ReactFiberWorkLoop.js
@@ -1003,7 +1003,7 @@ function ensureRootIsScheduled(root: FiberRoot, currentTime: number) {
 
 // This is the entry point for every concurrent task, i.e. anything that
 // goes through Scheduler.
-function performConcurrentWorkOnRoot(root: FiberRoot, didTimeout) {
+function performConcurrentWorkOnRoot(root: FiberRoot, didTimeout: boolean) {
   if (enableProfilerTimer && enableProfilerNestedUpdatePhase) {
     resetNestedUpdateFlag();
   }
@@ -3897,6 +3897,7 @@ export function restorePendingUpdaters(root: FiberRoot, lanes: Lanes): void {
 }
 
 const fakeActCallbackNode = {};
+// $FlowFixMe[missing-local-annot]
 function scheduleCallback(priorityLevel: any, callback) {
   if (__DEV__) {
     // If we're currently inside an `act` scope, bypass Scheduler and push to
diff --git a/packages/react-server-dom-relay/src/ReactFlightDOMRelayClientHostConfig.js b/packages/react-server-dom-relay/src/ReactFlightDOMRelayClientHostConfig.js
index a611259e76d07..a4dccf3513a35 100644
--- a/packages/react-server-dom-relay/src/ReactFlightDOMRelayClientHostConfig.js
+++ b/packages/react-server-dom-relay/src/ReactFlightDOMRelayClientHostConfig.js
@@ -44,6 +44,7 @@ export function resolveModuleReference<T>(
   return resolveModuleReferenceImpl(moduleData);
 }
 
+// $FlowFixMe[missing-local-annot]
 function parseModelRecursively(response: Response, parentObj, key, value) {
   if (typeof value === 'string') {
     return parseModelString(response, parentObj, key, value);
diff --git a/packages/react-server-dom-webpack/src/ReactFlightWebpackNodeRegister.js b/packages/react-server-dom-webpack/src/ReactFlightWebpackNodeRegister.js
index fc686b0db5d8f..b23a5918d8af7 100644
--- a/packages/react-server-dom-webpack/src/ReactFlightWebpackNodeRegister.js
+++ b/packages/react-server-dom-webpack/src/ReactFlightWebpackNodeRegister.js
@@ -54,6 +54,7 @@ module.exports = function register() {
             // If this module is expected to return a Promise (such as an AsyncModule) then
             // we should resolve that with a client reference that unwraps the Promise on
             // the client.
+            // $FlowFixMe[missing-local-annot]
             const then = function then(resolve, reject: any) {
               const moduleReference: {[string]: any, ...} = {
                 $$typeof: MODULE_REFERENCE,
diff --git a/packages/react-server-dom-webpack/src/ReactFlightWebpackPlugin.js b/packages/react-server-dom-webpack/src/ReactFlightWebpackPlugin.js
index df2f78823f9de..0cdc501446822 100644
--- a/packages/react-server-dom-webpack/src/ReactFlightWebpackPlugin.js
+++ b/packages/react-server-dom-webpack/src/ReactFlightWebpackPlugin.js
@@ -144,6 +144,7 @@ export default class ReactFlightWebpackPlugin {
           new NullDependency.Template(),
         );
 
+        // $FlowFixMe[missing-local-annot]
         const handler = parser => {
           // We need to add all client references as dependency of something in the graph so
           // Webpack knows which entries need to know about the relevant chunks and include the
@@ -220,6 +221,7 @@ export default class ReactFlightWebpackPlugin {
               return c.id;
             });
 
+            // $FlowFixMe[missing-local-annot]
             function recordModule(id: any, module) {
               // TODO: Hook into deps instead of the target module.
               // That way we know by the type of dep whether to include.
diff --git a/packages/react-server-native-relay/src/ReactFlightNativeRelayClientHostConfig.js b/packages/react-server-native-relay/src/ReactFlightNativeRelayClientHostConfig.js
index 012d005ac83ad..ae2e2c0afb028 100644
--- a/packages/react-server-native-relay/src/ReactFlightNativeRelayClientHostConfig.js
+++ b/packages/react-server-native-relay/src/ReactFlightNativeRelayClientHostConfig.js
@@ -44,6 +44,7 @@ export function resolveModuleReference<T>(
   return resolveModuleReferenceImpl(moduleData);
 }
 
+// $FlowFixMe[missing-local-annot]
 function parseModelRecursively(response: Response, parentObj, key, value) {
   if (typeof value === 'string') {
     return parseModelString(response, parentObj, key, value);
diff --git a/packages/react-server/src/ReactFizzClassComponent.js b/packages/react-server/src/ReactFizzClassComponent.js
index 73f3ec55f93ef..f03117f65a440 100644
--- a/packages/react-server/src/ReactFizzClassComponent.js
+++ b/packages/react-server/src/ReactFizzClassComponent.js
@@ -109,6 +109,7 @@ const classComponentUpdater = {
   isMounted(inst: any) {
     return false;
   },
+  // $FlowFixMe[missing-local-annot]
   enqueueSetState(inst: any, payload: any, callback) {
     const internals: InternalInstance = getInstance(inst);
     if (internals.queue === null) {
@@ -132,6 +133,7 @@ const classComponentUpdater = {
       }
     }
   },
+  // $FlowFixMe[missing-local-annot]
   enqueueForceUpdate(inst: any, callback) {
     const internals: InternalInstance = getInstance(inst);
     if (internals.queue === null) {
diff --git a/packages/react-server/src/ReactFizzServer.js b/packages/react-server/src/ReactFizzServer.js
index ac03ae25689b1..bc7ece8424d12 100644
--- a/packages/react-server/src/ReactFizzServer.js
+++ b/packages/react-server/src/ReactFizzServer.js
@@ -1301,6 +1301,7 @@ function renderElement(
   );
 }
 
+// $FlowFixMe[missing-local-annot]
 function validateIterable(iterable, iteratorFn: Function): void {
   if (__DEV__) {
     // We don't support rendering Generators because it's a mutation.
diff --git a/packages/react-test-renderer/src/ReactTestRenderer.js b/packages/react-test-renderer/src/ReactTestRenderer.js
index 4645047977113..50153791e9fcc 100644
--- a/packages/react-test-renderer/src/ReactTestRenderer.js
+++ b/packages/react-test-renderer/src/ReactTestRenderer.js
@@ -133,6 +133,7 @@ function toJSON(inst: Instance | TextInstance): ReactTestRendererNode | null {
   }
 }
 
+// $FlowFixMe[missing-local-annot]
 function childrenToTree(node) {
   if (!node) {
     return null;
@@ -146,6 +147,7 @@ function childrenToTree(node) {
   return flatten(children.map(toTree));
 }
 
+// $FlowFixMe[missing-local-annot]
 function nodeAndSiblingsArray(nodeWithSibling) {
   const array = [];
   let node = nodeWithSibling;
@@ -156,6 +158,7 @@ function nodeAndSiblingsArray(nodeWithSibling) {
   return array;
 }
 
+// $FlowFixMe[missing-local-annot]
 function flatten(arr) {
   const result = [];
   const stack = [{i: 0, array: arr}];
@@ -449,6 +452,7 @@ function propsMatch(props: Object, filter: Object): boolean {
   return true;
 }
 
+// $FlowFixMe[missing-local-annot]
 function onRecoverableError(error) {
   // TODO: Expose onRecoverableError option to userspace
   // eslint-disable-next-line react-internal/no-production-logging, react-internal/warning-args
diff --git a/packages/react/src/ReactLazy.js b/packages/react/src/ReactLazy.js
index 6537ef601e71b..04c5654bc80cf 100644
--- a/packages/react/src/ReactLazy.js
+++ b/packages/react/src/ReactLazy.js
@@ -144,6 +144,7 @@ export function lazy<T>(
         get() {
           return defaultProps;
         },
+        // $FlowFixMe[missing-local-annot]
         set(newDefaultProps) {
           console.error(
             'React.lazy(...): It is not supported to assign `defaultProps` to ' +
@@ -163,6 +164,7 @@ export function lazy<T>(
         get() {
           return propTypes;
         },
+        // $FlowFixMe[missing-local-annot]
         set(newPropTypes) {
           console.error(
             'React.lazy(...): It is not supported to assign `propTypes` to ' +
diff --git a/packages/shared/invokeGuardedCallbackImpl.js b/packages/shared/invokeGuardedCallbackImpl.js
index 217fc04e9789e..d129a35784a5d 100644
--- a/packages/shared/invokeGuardedCallbackImpl.js
+++ b/packages/shared/invokeGuardedCallbackImpl.js
@@ -156,6 +156,7 @@ if (__DEV__) {
       let didSetError = false;
       let isCrossOriginError = false;
 
+      // $FlowFixMe[missing-local-annot]
       function handleWindowError(event) {
         error = event.error;
         didSetError = true;
diff --git a/scripts/flow/config/flowconfig b/scripts/flow/config/flowconfig
index f746dfa43bdae..a4c50ad930eb6 100644
--- a/scripts/flow/config/flowconfig
+++ b/scripts/flow/config/flowconfig
@@ -43,7 +43,7 @@ untyped-type-import=error
 %CI_MAX_WORKERS%
 exact_by_default=true
 munge_underscores=false
-enforce_local_inference_annotations=false
+enforce_local_inference_annotations=true
 
 # Substituted by createFlowConfig.js:
 %REACT_RENDERER_FLOW_OPTIONS%