facebook · SamChou19815 · Apr 2, 2026 · Apr 2, 2026 · Apr 2, 2026 · Apr 2, 2026
diff --git a/flow-typed/environments/bom.js b/flow-typed/environments/bom.js
@@ -874,6 +874,7 @@ declare class SharedWorker extends EventTarget {
 declare function importScripts(...urls: Array<string | TrustedScriptURL>): void;
 
 declare class WorkerGlobalScope extends EventTarget {
+  // $FlowFixMe[incompatible-variance]
   self: this;
   location: WorkerLocation;
   navigator: WorkerNavigator;

diff --git a/flow-typed/environments/dom.js b/flow-typed/environments/dom.js
@@ -1263,6 +1263,7 @@ declare class HTMLCollection<+Elem: Element> {
   length: number;
   item(nameOrIndex?: any, optionalIndex?: any): Elem | null;
   namedItem(name: string): Elem | null;
+  // $FlowFixMe[incompatible-variance]
   [index: number | string]: Elem;
 }
 

diff --git a/flow-typed/environments/node.js b/flow-typed/environments/node.js
@@ -1908,6 +1908,7 @@ type http$agentOptions = {
 declare class http$Agent<+SocketT = net$Socket> {
   constructor(options: http$agentOptions): void;
   destroy(): void;
+  // $FlowFixMe[incompatible-variance]
   freeSockets: {[name: string]: $ReadOnlyArray<SocketT>, ...};
   getName(options: {
     host: string,
@@ -1917,7 +1918,9 @@ declare class http$Agent<+SocketT = net$Socket> {
   }): string;
   maxFreeSockets: number;
   maxSockets: number;
+  // $FlowFixMe[incompatible-variance]
   requests: {[name: string]: $ReadOnlyArray<http$ClientRequest<SocketT>>, ...};
+  // $FlowFixMe[incompatible-variance]
   sockets: {[name: string]: $ReadOnlyArray<SocketT>, ...};
 }
 

diff --git a/flow-typed/environments/streams.js b/flow-typed/environments/streams.js
@@ -42,7 +42,7 @@ declare class ReadableStreamReader {
 
   closed: boolean;
 
-  cancel(reason: string): void;
+  cancel(reason: string): Promise<void>;
   read(): Promise<{
     value: ?any,
     done: boolean,

diff --git a/package.json b/package.json
@@ -75,8 +75,8 @@
     "eslint-plugin-react-internal": "link:./scripts/eslint-rules",
     "fbjs-scripts": "^3.0.1",
     "filesize": "^6.0.1",
-    "flow-bin": "^0.279.0",
-    "flow-remove-types": "^2.279.0",
+    "flow-bin": "^0.307.1",
+    "flow-remove-types": "^2.307.1",
     "flow-typed": "^4.1.1",
     "glob": "^7.1.6",
     "glob-stream": "^6.1.0",

diff --git a/packages/internal-test-utils/internalAct.js b/packages/internal-test-utils/internalAct.js
@@ -163,7 +163,7 @@ export async function act<T>(scope: () => Thenable<T>): Thenable<T> {
       throw thrownError;
     }
 
-    // $FlowFixMe[incompatible-return]
+    // $FlowFixMe[incompatible-type]
     return result;
   } finally {
     const depth = actingUpdatesScopeDepth;
@@ -285,7 +285,7 @@ export async function serverAct<T>(scope: () => Thenable<T>): Thenable<T> {
       throw thrownError;
     }
 
-    // $FlowFixMe[incompatible-return]
+    // $FlowFixMe[incompatible-type]
     return result;
   } finally {
     if (typeof process === 'object') {

diff --git a/packages/react-cache/src/LRU.js b/packages/react-cache/src/LRU.js
@@ -115,6 +115,7 @@ export function createLRU<T>(limit: number): LRU<T> {
 
   function access(entry: Entry<T>): T {
     const next = entry.next;
+    // $FlowFixMe[invalid-compare]
     if (next !== null) {
       // Entry already cached
       const resolvedFirst: Entry<T> = (first: any);

diff --git a/packages/react-client/src/ReactClientConsoleConfigBrowser.js b/packages/react-client/src/ReactClientConsoleConfigBrowser.js
@@ -35,7 +35,7 @@ export function bindToConsole(
     case 'groupEnd':
     case 'table': {
       // These methods cannot be colorized because they don't take a formatting string.
-      // $FlowFixMe
+      // $FlowFixMe[incompatible-type]
       return bind.apply(console[methodName], [console].concat(args)); // eslint-disable-line react-internal/no-production-logging
     }
     case 'assert': {
@@ -68,6 +68,7 @@ export function bindToConsole(
   // The "this" binding in the "bind";
   newArgs.unshift(console);
 
-  // $FlowFixMe
+  // $FlowFixMe[incompatible-type]
+  // $FlowFixMe[invalid-computed-prop]
   return bind.apply(console[methodName], newArgs); // eslint-disable-line react-internal/no-production-logging
 }
diff --git a/packages/react-client/src/ReactClientConsoleConfigPlain.js b/packages/react-client/src/ReactClientConsoleConfigPlain.js
@@ -25,7 +25,7 @@ export function bindToConsole(
     case 'groupEnd':
     case 'table': {
       // These methods cannot be colorized because they don't take a formatting string.
-      // $FlowFixMe
+      // $FlowFixMe[incompatible-type]
       return bind.apply(console[methodName], [console].concat(args)); // eslint-disable-line react-internal/no-production-logging
     }
     case 'assert': {
@@ -49,6 +49,7 @@ export function bindToConsole(
   // The "this" binding in the "bind";
   newArgs.unshift(console);
 
-  // $FlowFixMe
+  // $FlowFixMe[incompatible-type]
+  // $FlowFixMe[invalid-computed-prop]
   return bind.apply(console[methodName], newArgs); // eslint-disable-line react-internal/no-production-logging
 }
diff --git a/packages/react-client/src/ReactClientConsoleConfigServer.js b/packages/react-client/src/ReactClientConsoleConfigServer.js
@@ -36,7 +36,7 @@ export function bindToConsole(
     case 'groupEnd':
     case 'table': {
       // These methods cannot be colorized because they don't take a formatting string.
-      // $FlowFixMe
+      // $FlowFixMe[incompatible-type]
       return bind.apply(console[methodName], [console].concat(args)); // eslint-disable-line react-internal/no-production-logging
     }
     case 'assert': {
@@ -69,6 +69,7 @@ export function bindToConsole(
   // The "this" binding in the "bind";
   newArgs.unshift(console);
 
-  // $FlowFixMe
+  // $FlowFixMe[incompatible-type]
+  // $FlowFixMe[invalid-computed-prop]
   return bind.apply(console[methodName], newArgs); // eslint-disable-line react-internal/no-production-logging
 }
diff --git a/packages/react-client/src/ReactFlightClient.js b/packages/react-client/src/ReactFlightClient.js
@@ -281,12 +281,12 @@ ReactPromise.prototype.then = function <T>(
     const rejectCallback = reject;
     const wrapperPromise: Promise<T> = new Promise((res, rej) => {
       resolve = value => {
-        // $FlowFixMe
+        // $FlowFixMe[prop-missing]
         wrapperPromise._debugInfo = this._debugInfo;
         res(value);
       };
       reject = reason => {
-        // $FlowFixMe
+        // $FlowFixMe[prop-missing]
         wrapperPromise._debugInfo = this._debugInfo;
         rej(reason);
       };
@@ -499,6 +499,7 @@ function filterDebugInfo(
   response: Response,
   value: {_debugInfo: ReactDebugInfo, ...},
 ) {
+  // $FlowFixMe[invalid-compare]
   if (response._debugEndTime === null) {
     // No end time was defined, so we keep all debug info entries.
     return;
@@ -722,7 +723,7 @@ function triggerErrorOnChunk<T>(
     // a stream chunk since any other row shouldn't have more than one entry.
     const streamChunk: InitializedStreamChunk<any> = (chunk: any);
     const controller = streamChunk.reason;
-    // $FlowFixMe[incompatible-call]: The error method should accept mixed.
+    // $FlowFixMe[incompatible-type]: The error method should accept mixed.
     controller.error(error);
     return;
   }
@@ -3294,7 +3295,7 @@ function startReadableStream<T>(
       }
       closed = true;
       if (previousBlockedChunk === null) {
-        // $FlowFixMe[incompatible-call]
+        // $FlowFixMe[incompatible-type]
         controller.error(error);
       } else {
         const blockedChunk = previousBlockedChunk;
@@ -3526,11 +3527,12 @@ function resolveErrorDev(
   let error;
   const errorOptions =
     // We don't serialize Error.cause in prod so we never need to deserialize
+    // $FlowFixMe[constant-condition]
     __DEV__ && 'cause' in errorInfo
       ? {
           cause: reviveModel(
             response,
-            // $FlowFixMe[incompatible-cast] -- Flow thinks `cause` in `cause?: JSONValue` can be undefined after `in` check.
+            // $FlowFixMe[incompatible-type] -- Flow thinks `cause` in `cause?: JSONValue` can be undefined after `in` check.
             (errorInfo.cause: JSONValue),
             errorInfo,
             'cause',
@@ -3544,7 +3546,7 @@ function resolveErrorDev(
     __DEV__ && isAggregateError
       ? reviveModel(
           response,
-          // $FlowFixMe[incompatible-cast]
+          // $FlowFixMe[incompatible-type]
           (errorInfo.errors: JSONValue),
           errorInfo,
           'errors',
@@ -4059,7 +4061,7 @@ function initializeDebugInfo(
   }
   if (debugInfo.owner == null && response._debugRootOwner != null) {
     const componentInfoOrAsyncInfo: ReactComponentInfo | ReactAsyncInfo =
-      // $FlowFixMe: By narrowing `owner` to `null`, we narrowed `debugInfo` to `ReactComponentInfo`
+      // $FlowFixMe[incompatible-type]: By narrowing `owner` to `null`, we narrowed `debugInfo` to `ReactComponentInfo`
       debugInfo;
     // $FlowFixMe[cannot-write]
     componentInfoOrAsyncInfo.owner = response._debugRootOwner;
@@ -4411,7 +4413,7 @@ function logComponentInfo(
   childrenEndTime: number,
   isLastComponent: boolean,
 ): void {
-  // $FlowFixMe: Refined.
+  // $FlowFixMe[incompatible-type]: Refined.
   if (
     isLastComponent &&
     root.status === ERRORED &&
@@ -4590,7 +4592,7 @@ function flushComponentPerformance(
             if (componentEndTime > childrenEndTime) {
               childrenEndTime = componentEndTime;
             }
-            // $FlowFixMe: Refined.
+            // $FlowFixMe[incompatible-type]: Refined.
             const componentInfo: ReactComponentInfo = candidateInfo;
             logComponentInfo(
               response,
@@ -4614,7 +4616,7 @@ function flushComponentPerformance(
             if (endTime > childrenEndTime) {
               childrenEndTime = endTime;
             }
-            // $FlowFixMe: Refined.
+            // $FlowFixMe[incompatible-type]: Refined.
             const asyncInfo: ReactAsyncInfo = candidateInfo;
             const env = response._rootEnvironmentName;
             const promise = asyncInfo.awaited.value;
@@ -4677,7 +4679,7 @@ function flushComponentPerformance(
             if (componentEndTime > childrenEndTime) {
               childrenEndTime = componentEndTime;
             }
-            // $FlowFixMe: Refined.
+            // $FlowFixMe[incompatible-type]: Refined.
             const componentInfo: ReactComponentInfo = candidateInfo;
             const env = response._rootEnvironmentName;
             logComponentAborted(
@@ -5323,6 +5325,7 @@ function reviveModel(
     for (let i = 0; i < value.length; i++) {
       (value: any)[i] = reviveModel(response, value[i], value, '' + i);
     }
+    // $FlowFixMe[invalid-compare]
     if (value[0] === REACT_ELEMENT_TYPE) {
       // React element tuple
       return parseModelTuple(response, value);

diff --git a/packages/react-client/src/ReactFlightClientStreamConfigNode.js b/packages/react-client/src/ReactFlightClientStreamConfigNode.js
@@ -21,6 +21,7 @@ export function readPartialStringChunk(
   decoder: StringDecoder,
   buffer: Uint8Array,
 ): string {
+  // $FlowFixMe[incompatible-type]
   return decoder.decode(buffer, decoderOptions);
 }
 

diff --git a/packages/react-client/src/ReactFlightReplyClient.js b/packages/react-client/src/ReactFlightReplyClient.js
@@ -584,7 +584,7 @@ export function processReply(
       }
 
       if (isArray(value)) {
-        // $FlowFixMe[incompatible-return]
+        // $FlowFixMe[incompatible-type]
         return value;
       }
       // TODO: Should we the Object.prototype.toString.call() to test for cross-realm objects?
@@ -601,7 +601,7 @@ export function processReply(
         const prefix = formFieldPrefix + refId + '_';
         // $FlowFixMe[prop-missing]: FormData has forEach.
         value.forEach((originalValue: string | File, originalKey: string) => {
-          // $FlowFixMe[incompatible-call]
+          // $FlowFixMe[incompatible-type]
           data.append(prefix + originalKey, originalValue);
         });
         return serializeFormDataReference(refId);
@@ -695,6 +695,7 @@ export function processReply(
       const iteratorFn = getIteratorFn(value);
       if (iteratorFn) {
         const iterator = iteratorFn.call(value);
+        // $FlowFixMe[invalid-compare]
         if (iterator === value) {
           // Iterator, not Iterable
           const iteratorId = nextPartId++;
@@ -885,7 +886,7 @@ export function processReply(
       }
     }
     modelRoot = model;
-    // $FlowFixMe[incompatible-return] it's not going to be undefined because we'll encode it.
+    // $FlowFixMe[incompatible-type] it's not going to be undefined because we'll encode it.
     return JSON.stringify(model, resolveToJSON);
   }
 
@@ -911,7 +912,7 @@ export function processReply(
     // Otherwise, we use FormData to let us stream in the result.
     formData.set(formFieldPrefix + '0', json);
     if (pendingParts === 0) {
-      // $FlowFixMe[incompatible-call] this has already been refined.
+      // $FlowFixMe[incompatible-type] this has already been refined.
       resolve(formData);
     }
   }
@@ -990,7 +991,7 @@ function defaultEncodeFormAction(
     const prefixedData = new FormData();
     // $FlowFixMe[prop-missing]
     encodedFormData.forEach((value: string | File, key: string) => {
-      // $FlowFixMe[incompatible-call]
+      // $FlowFixMe[incompatible-type]
       prefixedData.append('$ACTION_' + identifierPrefix + ':' + key, value);
     });
     data = prefixedData;
@@ -1021,6 +1022,7 @@ function customEncodeFormAction(
     );
   }
   let boundPromise: Promise<Array<any>> = (referenceClosure.bound: any);
+  // $FlowFixMe[invalid-compare]
   if (boundPromise === null) {
     boundPromise = Promise.resolve([]);
   }
@@ -1200,6 +1202,7 @@ export function registerBoundServerReference<T: Function>(
 
   // Expose encoder for use by SSR, as well as a special bind that can be used to
   // keep server capabilities.
+  // $FlowFixMe[constant-condition]
   if (usedWithSSR) {
     // Only expose this in builds that would actually use it. Not needed in the browser.
     const $$FORM_ACTION =
@@ -1240,7 +1243,7 @@ function bind(this: Function): Function {
   const referenceClosure = knownServerReferences.get(this);
 
   if (!referenceClosure) {
-    // $FlowFixMe[incompatible-call]
+    // $FlowFixMe[incompatible-type]
     return FunctionBind.apply(this, arguments);
   }
 
@@ -1276,6 +1279,7 @@ function bind(this: Function): Function {
 
   // Expose encoder for use by SSR, as well as a special bind that can be used to
   // keep server capabilities.
+  // $FlowFixMe[constant-condition]
   if (usedWithSSR) {
     // Only expose this in builds that would actually use it. Not needed on the client.
     Object.defineProperties((newFn: any), {

diff --git a/packages/react-debug-tools/src/ReactDebugHooks.js b/packages/react-debug-tools/src/ReactDebugHooks.js
@@ -200,6 +200,7 @@ const SuspenseException: mixed = new Error(
 );
 
 function use<T>(usable: Usable<T>): T {
+  // $FlowFixMe[invalid-compare]
   if (usable !== null && typeof usable === 'object') {
     // $FlowFixMe[method-unbinding]
     if (typeof usable.then === 'function') {
@@ -729,8 +730,9 @@ function useActionState<S, P>(
 function useHostTransitionStatus(): TransitionStatus {
   const status = readContext<TransitionStatus>(
     // $FlowFixMe[prop-missing] `readContext` only needs _currentValue
+    // $FlowFixMe[incompatible-type]
     ({
-      // $FlowFixMe[incompatible-cast] TODO: Incorrect bottom value without access to Fiber config.
+      // $FlowFixMe[incompatible-type] TODO: Incorrect bottom value without access to Fiber config.
       _currentValue: null,
     }: ReactContext<TransitionStatus>),
   );
@@ -1341,10 +1343,12 @@ export function inspectHooksOfFiber(
   } else if (hasOwnProperty.call(currentFiber, 'dependencies_old')) {
     const dependencies: Dependencies = (currentFiber: any).dependencies_old;
     currentContextDependency =
+      // $FlowFixMe[invalid-compare]
       dependencies !== null ? dependencies.firstContext : null;
   } else if (hasOwnProperty.call(currentFiber, 'dependencies_new')) {
     const dependencies: Dependencies = (currentFiber: any).dependencies_new;
     currentContextDependency =
+      // $FlowFixMe[invalid-compare]
       dependencies !== null ? dependencies.firstContext : null;
   } else if (hasOwnProperty.call(currentFiber, 'contextDependencies')) {
     const contextDependencies = (currentFiber: any).contextDependencies;