[flow] enable LTI inference mode (#26104)

This is the next generation inference mode for Flow.

package.json

@@ -61,7 +61,7 @@
     "eslint-plugin-react-internal": "link:./scripts/eslint-rules",
     "fbjs-scripts": "^3.0.1",
     "filesize": "^6.0.1",
-    "flow-bin": "^0.199.0",
+    "flow-bin": "^0.199.1",
     "flow-remove-types": "^2.198.2",
     "glob": "^7.1.6",
     "glob-stream": "^6.1.0",

packages/jest-react/src/internalAct.js

@@ -77,7 +77,7 @@ export function act<T>(scope: () => Thenable<T> | T): Thenable<T> {
     ) {
       const thenableResult: Thenable<T> = (result: any);
       return {
-        then(resolve, reject) {
+        then(resolve: T => mixed, reject: mixed => mixed) {
           thenableResult.then(
             returnValue => {
               flushActWork(
@@ -108,7 +108,7 @@ export function act<T>(scope: () => Thenable<T> | T): Thenable<T> {
           didFlushWork = Scheduler.unstable_flushAllWithoutAsserting();
         } while (didFlushWork);
         return {
-          then(resolve, reject) {
+          then(resolve: T => mixed, reject: mixed => mixed) {
             resolve(returnValue);
           },
         };

packages/react-cache/src/ReactCacheOld.js

@@ -85,11 +85,11 @@ function identityHashFn(input) {
 }
 
 const CACHE_LIMIT = 500;
-const lru = createLRU(CACHE_LIMIT);
+const lru = createLRU<$FlowFixMe>(CACHE_LIMIT);
 
 const entries: Map<Resource<any, any>, Map<any, any>> = new Map();
 
-const CacheContext = React.createContext(null);
+const CacheContext = React.createContext<mixed>(null);
 
 function accessResult<I, K, V>(
   resource: any,

packages/react-client/src/ReactFlightClient.js

@@ -129,13 +129,13 @@ Chunk.prototype.then = function <T>(
     case BLOCKED:
       if (resolve) {
         if (chunk.value === null) {
-          chunk.value = [];
+          chunk.value = ([]: Array<(T) => mixed>);
         }
         chunk.value.push(resolve);
       }
       if (reject) {
         if (chunk.reason === null) {
-          chunk.reason = [];
+          chunk.reason = ([]: Array<(mixed) => mixed>);
         }
         chunk.reason.push(reject);
       }
@@ -435,7 +435,7 @@ function createModelResolver<T>(
   chunk: SomeChunk<T>,
   parentObject: Object,
   key: string,
-) {
+): (value: any) => void {
   let blocked;
   if (initializingChunkBlockedModel) {
     blocked = initializingChunkBlockedModel;
@@ -446,7 +446,6 @@ function createModelResolver<T>(
       value: null,
     };
   }
-  // $FlowFixMe[missing-local-annot]
   return value => {
     parentObject[key] = value;
     blocked.deps--;
@@ -465,7 +464,7 @@ function createModelResolver<T>(
   };
 }
 
-function createModelReject<T>(chunk: SomeChunk<T>) {
+function createModelReject<T>(chunk: SomeChunk<T>): (error: mixed) => void {
   return (error: mixed) => triggerErrorOnChunk(chunk, error);
 }
 
@@ -583,7 +582,7 @@ export function resolveModule(
   const chunks = response._chunks;
   const chunk = chunks.get(id);
   const moduleMetaData: ModuleMetaData = parseModel(response, model);
-  const moduleReference = resolveClientReference(
+  const moduleReference = resolveClientReference<$FlowFixMe>(
     response._bundlerConfig,
     moduleMetaData,
   );

packages/react-debug-tools/src/ReactDebugHooks.js

@@ -60,13 +60,13 @@ function getPrimitiveStackCache(): Map<string, Array<any>> {
   // This initializes a cache of all primitive hooks so that the top
   // most stack frames added by calling the primitive hook can be removed.
   if (primitiveStackCache === null) {
-    const cache = new Map();
+    const cache = new Map<string, Array<any>>();
     let readHookLog;
     try {
       // Use all hooks here to add them to the hook log.
       Dispatcher.useContext(({_currentValue: null}: any));
       Dispatcher.useState(null);
-      Dispatcher.useReducer((s, a) => s, null);
+      Dispatcher.useReducer((s: mixed, a: mixed) => s, null);
       Dispatcher.useRef(null);
       if (typeof Dispatcher.useCacheRefresh === 'function') {
         // This type check is for Flow only.
@@ -809,7 +809,7 @@ export function inspectHooksOfFiber(
   // Set up the current hook so that we can step through and read the
   // current state from them.
   currentHook = (fiber.memoizedState: Hook);
-  const contextMap = new Map();
+  const contextMap = new Map<ReactContext<$FlowFixMe>, $FlowFixMe>();
   try {
     setupContexts(contextMap, fiber);
     if (fiber.tag === ForwardRef) {

packages/react-devtools-core/src/backend.js

@@ -67,7 +67,7 @@ export function connectToDevTools(options: ?ConnectOptions) {
     useHttps = false,
     port = 8097,
     websocket,
-    resolveRNStyle = null,
+    resolveRNStyle = (null: $FlowFixMe),
     retryConnectionDelay = 2000,
     isAppActive = () => true,
     devToolsSettingsManager,
@@ -230,7 +230,7 @@ export function connectToDevTools(options: ?ConnectOptions) {
             get() {
               return lazyResolveRNStyle;
             },
-            set(value) {
+            set(value: $FlowFixMe) {
               lazyResolveRNStyle = value;
               initAfterTick();
             },
@@ -246,7 +246,7 @@ export function connectToDevTools(options: ?ConnectOptions) {
             get() {
               return lazyNativeStyleEditorValidAttributes;
             },
-            set(value) {
+            set(value: $FlowFixMe) {
               lazyNativeStyleEditorValidAttributes = value;
               initAfterTick();
             },

packages/react-devtools-core/src/editor.js

@@ -188,7 +188,7 @@ export function launchEditor(
   }
   childProcess.on('error', function () {});
   // $FlowFixMe[incompatible-use] found when upgrading Flow
-  childProcess.on('exit', function (errorCode) {
+  childProcess.on('exit', function () {
     childProcess = null;
   });
 }

packages/react-devtools-core/src/standalone.js

@@ -168,7 +168,7 @@ function onDisconnected() {
 }
 
 // $FlowFixMe[missing-local-annot]
-function onError({code, message}) {
+function onError({code, message}: $FlowFixMe) {
   safeUnmount();
 
   if (code === 'EADDRINUSE') {
@@ -335,13 +335,13 @@ function startServer(
     initialize(socket);
   });
 
-  server.on('error', event => {
+  server.on('error', (event: $FlowFixMe) => {
     onError(event);
     log.error('Failed to start the DevTools server', event);
     startServerTimeoutID = setTimeout(() => startServer(port), 1000);
   });
 
-  httpServer.on('request', (request, response) => {
+  httpServer.on('request', (request: $FlowFixMe, response: $FlowFixMe) => {
     // Serve a file that immediately sets up the connection.
     const backendFile = readFileSync(join(__dirname, 'backend.js'));
 
@@ -377,7 +377,7 @@ function startServer(
     );
   });
 
-  httpServer.on('error', event => {
+  httpServer.on('error', (event: $FlowFixMe) => {
     onError(event);
     statusListener('Failed to start the server.', 'error');
     startServerTimeoutID = setTimeout(() => startServer(port), 1000);

packages/react-devtools-extensions/src/backend.js

@@ -9,7 +9,7 @@
 let welcomeHasInitialized = false;
 
 // $FlowFixMe[missing-local-annot]
-function welcome(event) {
+function welcome(event: $FlowFixMe) {
   if (
     event.source !== window ||
     event.data.source !== 'react-devtools-content-script'
@@ -56,8 +56,7 @@ function setup(hook: any) {
 
   const bridge = new Bridge({
     listen(fn) {
-      // $FlowFixMe[missing-local-annot]
-      const listener = event => {
+      const listener = (event: $FlowFixMe) => {
         if (
           event.source !== window ||
           !event.data ||

packages/react-devtools-inline/src/backend.js

@@ -10,8 +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 => {
+  const onSavedPreferences = (data: $FlowFixMe) => {
     // This is the only message we're listening for,
     // so it's safe to cleanup after we've received it.
     bridge.removeListener('savedPreferences', onSavedPreferences);
@@ -102,8 +101,7 @@ export function createBridge(contentWindow: any, wall?: Wall): BackendBridge {
   if (wall == null) {
     wall = {
       listen(fn) {
-        // $FlowFixMe[missing-local-annot]
-        const onMessage = ({data}) => {
+        const onMessage = ({data}: $FlowFixMe) => {
           fn(data);
         };
         contentWindow.addEventListener('message', onMessage);

packages/react-devtools-shared/src/backend/DevToolsComponentStackFrame.js

@@ -54,7 +54,7 @@ let reentry = false;
 let componentFrameCache;
 if (__DEV__) {
   const PossiblyWeakMap = typeof WeakMap === 'function' ? WeakMap : Map;
-  componentFrameCache = new PossiblyWeakMap();
+  componentFrameCache = new PossiblyWeakMap<$FlowFixMe, string>();
 }
 
 export function describeNativeComponentFrame(

packages/react-devtools-shared/src/backend/StyleX/utils.js

@@ -13,7 +13,7 @@ import isArray from 'react-devtools-shared/src/isArray';
 const cachedStyleNameToValueMap: Map<string, string> = new Map();
 
 export function getStyleXData(data: any): StyleXPlugin {
-  const sources = new Set();
+  const sources = new Set<string>();
   const resolvedStyles = {};
 
   crawlData(data, sources, resolvedStyles);

packages/react-devtools-shared/src/backend/legacy/renderer.js

@@ -503,7 +503,7 @@ export function attach(
     const numUnmountIDs =
       pendingUnmountedIDs.length + (pendingUnmountedRootID === null ? 0 : 1);
 
-    const operations = new Array(
+    const operations = new Array<number>(
       // Identify which renderer this update is coming from.
       2 + // [rendererID, rootFiberID]
         // How big is the string table?

packages/react-devtools-shared/src/backend/profilingHooks.js

@@ -18,14 +18,16 @@ import type {Fiber} from 'react-reconciler/src/ReactInternalTypes';
 import type {Wakeable} from 'shared/ReactTypes';
 import type {
   BatchUID,
+  InternalModuleSourceToRanges,
   LaneToLabelMap,
   ReactComponentMeasure,
+  ReactLane,
   ReactMeasure,
   ReactMeasureType,
-  TimelineData,
-  SuspenseEvent,
-  SchedulingEvent,
   ReactScheduleStateUpdateEvent,
+  SchedulingEvent,
+  SuspenseEvent,
+  TimelineData,
 } from 'react-devtools-timeline/src/types';
 
 import isArray from 'shared/isArray';
@@ -837,7 +839,8 @@ export function createProfilingHooks({
       isProfiling = value;
 
       if (isProfiling) {
-        const internalModuleSourceToRanges = new Map();
+        const internalModuleSourceToRanges: InternalModuleSourceToRanges =
+          new Map();
 
         if (supportsUserTimingV3) {
           const ranges = getInternalModuleRanges();
@@ -856,7 +859,7 @@ export function createProfilingHooks({
           }
         }
 
-        const laneToReactMeasureMap = new Map();
+        const laneToReactMeasureMap = new Map<ReactLane, ReactMeasure[]>();
         let lane = 1;
         for (let index = 0; index < REACT_TOTAL_NUM_LANES; index++) {
           laneToReactMeasureMap.set(lane, []);

packages/react-devtools-shared/src/backend/renderer.js

@@ -415,7 +415,7 @@ export function getInternalReactConstants(version: string): {
     TracingMarkerComponent,
   } = ReactTypeOfWork;
 
-  function resolveFiberType(type: any) {
+  function resolveFiberType(type: any): $FlowFixMe {
     const typeSymbol = getTypeSymbol(type);
     switch (typeSymbol) {
       case MEMO_NUMBER:
@@ -1627,7 +1627,7 @@ export function attach(
     }
   }
 
-  let flushPendingErrorsAndWarningsAfterDelayTimeoutID = null;
+  let flushPendingErrorsAndWarningsAfterDelayTimeoutID: null | TimeoutID = null;
 
   function clearPendingErrorsAndWarningsAfterDelay() {
     if (flushPendingErrorsAndWarningsAfterDelayTimeoutID !== null) {
@@ -1790,7 +1790,7 @@ export function attach(
       pendingSimulatedUnmountedIDs.length +
       (pendingUnmountedRootID === null ? 0 : 1);
 
-    const operations = new Array(
+    const operations = new Array<number>(
       // Identify which renderer this update is coming from.
       2 + // [rendererID, rootFiberID]
         // How big is the string table?
@@ -4144,7 +4144,7 @@ export function attach(
 
   // Map of id and its force error status: true (error), false (toggled off),
   // null (do nothing)
-  const forceErrorForFiberIDs = new Map();
+  const forceErrorForFiberIDs = new Map<number | null, $FlowFixMe>();
 
   function shouldErrorFiberAccordingToMap(fiber: any) {
     if (typeof setErrorHandler !== 'function') {
@@ -4209,7 +4209,7 @@ export function attach(
     return false;
   }
 
-  const forceFallbackForSuspenseIDs = new Set();
+  const forceFallbackForSuspenseIDs = new Set<number>();
 
   function shouldSuspendFiberAccordingToSet(fiber: any) {
     const maybeID = getFiberIDUnsafe(((fiber: any): Fiber));

packages/react-devtools-shared/src/backend/utils.js

@@ -144,7 +144,7 @@ export function getEffectDurations(root: Object): {
 }
 
 export function serializeToString(data: any): string {
-  const cache = new Set();
+  const cache = new Set<mixed>();
   // Use a custom replacer function to protect against circular references.
   return JSON.stringify(data, (key, value) => {
     if (typeof value === 'object' && value !== null) {

packages/react-devtools-shared/src/backend/views/utils.js

@@ -83,7 +83,7 @@ export function getNestedBoundingClientRect(
 ): Rect {
   const ownerIframe = getOwnerIframe(node);
   if (ownerIframe && ownerIframe !== boundaryWindow) {
-    const rects = [node.getBoundingClientRect()];
+    const rects: Array<Rect | ClientRect> = [node.getBoundingClientRect()];
     let currentIframe: null | HTMLElement = ownerIframe;
     let onlyOneMore = false;
     while (currentIframe) {

packages/react-devtools-shared/src/devtools/ProfilerStore.js

@@ -308,7 +308,7 @@ export default class ProfilerStore extends EventEmitter<{
       // Record snapshot of tree at the time profiling is started.
       // This info is required to handle cases of e.g. nodes being removed during profiling.
       this._store.roots.forEach(rootID => {
-        const profilingSnapshots = new Map();
+        const profilingSnapshots = new Map<number, SnapshotNode>();
         this._initialSnapshotsByRootID.set(rootID, profilingSnapshots);
         this._takeProfilingSnapshotRecursive(rootID, profilingSnapshots);
       });

packages/react-devtools-shared/src/devtools/store.js

@@ -642,7 +642,7 @@ export default class Store extends EventEmitter<{
   }
 
   getOwnersListForElement(ownerID: number): Array<Element> {
-    const list = [];
+    const list: Array<Element> = [];
     const element = this._idToElement.get(ownerID);
     if (element != null) {
       list.push({
@@ -900,7 +900,7 @@ export default class Store extends EventEmitter<{
     let i = 2;
 
     // Reassemble the string table.
-    const stringTable = [
+    const stringTable: Array<string | null> = [
       null, // ID = 0 corresponds to the null string.
     ];
     const stringTableSize = operations[i++];

packages/react-devtools-shared/src/devtools/views/Components/EditableName.js

@@ -43,7 +43,7 @@ export default function EditableName({
   const [isValid, setIsValid] = useState(false);
 
   const handleChange = useCallback(
-    ({target}) => {
+    ({target}: $FlowFixMe) => {
       let value = target.value;
       if (!allowWhiteSpace) {
         value = value.trim();
@@ -61,7 +61,7 @@ export default function EditableName({
   );
 
   const handleKeyDown = useCallback(
-    event => {
+    (event: $FlowFixMe) => {
       // Prevent keydown events from e.g. change selected element in the tree
       event.stopPropagation();