[flow] enable LTI inference mode (#26104)

This is the next generation inference mode for Flow.

Author: kassens

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);