Flow: upgrade to 0.140 (#25252)

This update range includes:

- `types_first` ([blog](https://flow.org/en/docs/lang/types-first/), all exports need annotated types) is default. I disabled this for now to make that change incremental.
- Generics that escape the scope they are defined in are an error. I fixed some with explicit type annotations and some are suppressed that I didn't easily figure out.

Author: kassens

package.json

@@ -63,7 +63,7 @@
     "eslint-plugin-react-internal": "link:./scripts/eslint-rules",
     "fbjs-scripts": "1.2.0",
     "filesize": "^6.0.1",
-    "flow-bin": "^0.132",
+    "flow-bin": "^0.140",
     "glob": "^7.1.6",
     "glob-stream": "^6.1.0",
     "google-closure-compiler": "^20200517.0.0",

packages/react-cache/src/LRU.js

@@ -23,7 +23,14 @@ type Entry<T> = {
   next: Entry<T>,
 };
 
-export function createLRU<T>(limit: number) {
+type LRU<T> = {
+  add(value: Object, onDelete: () => mixed): Entry<Object>,
+  update(entry: Entry<T>, newValue: T): void,
+  access(entry: Entry<T>): T,
+  setLimit(newLimit: number): void,
+};
+
+export function createLRU<T>(limit: number): LRU<T> {
   let LIMIT = limit;
 
   // Circular, doubly-linked list
@@ -135,7 +142,7 @@ export function createLRU<T>(limit: number) {
     return entry.value;
   }
 
-  function setLimit(newLimit: number) {
+  function setLimit(newLimit: number): void {
     LIMIT = newLimit;
     scheduleCleanUp();
   }

packages/react-cache/src/ReactCacheOld.js

@@ -122,6 +122,7 @@ function accessResult<I, K, V>(
       status: Pending,
       value: thenable,
     };
+    // $FlowFixMe[escaped-generic] discovered when updating Flow
     const newEntry = lru.add(newResult, deleteEntry.bind(null, resource, key));
     entriesForResource.set(key, newEntry);
     return newResult;

packages/react-dom/src/client/ReactDOMInput.js

@@ -177,6 +177,7 @@ export function updateWrapper(element: Element, props: Object) {
   if (value != null) {
     if (type === 'number') {
       if (
+        // $FlowFixMe[incompatible-type]
         (value === 0 && node.value === '') ||
         // We explicitly want to coerce to number here if possible.
         // eslint-disable-next-line

packages/react-dom/src/server/ReactDOMFizzServerNode.js

@@ -10,6 +10,7 @@
 import type {ReactNodeList} from 'shared/ReactTypes';
 import type {Writable} from 'stream';
 import type {BootstrapScriptDescriptor} from './ReactDOMServerFormatConfig';
+import type {Destination} from 'react-server/src/ReactServerStreamConfigNode';
 
 import ReactVersion from 'shared/ReactVersion';
 
@@ -25,7 +26,7 @@ import {
   createRootFormatContext,
 } from './ReactDOMServerFormatConfig';
 
-function createDrainHandler(destination, request) {
+function createDrainHandler(destination: Destination, request) {
   return () => startFlowing(request, destination);
 }
 

packages/react-native-renderer/src/legacy-events/accumulate.js

@@ -33,6 +33,8 @@ function accumulate<T>(
   // Both are not empty. Warning: Never call x.concat(y) when you are not
   // certain that x is an Array (x could be a string with concat method).
   if (isArray(current)) {
+    /* $FlowFixMe[incompatible-return] if `current` is `T` and `T` an array,
+     * `isArray` might refine to the array element type of `T` */
     return current.concat(next);
   }
 

packages/react-native-renderer/src/legacy-events/forEachAccumulated.js

@@ -22,6 +22,7 @@ function forEachAccumulated<T>(
   scope: ?any,
 ) {
   if (Array.isArray(arr)) {
+    // $FlowFixMe[incompatible-call] if `T` is an array, `cb` cannot be called
     arr.forEach(cb, scope);
   } else if (arr) {
     cb.call(scope, arr);

packages/react-reconciler/src/ReactFiberClassUpdateQueue.new.js

@@ -476,6 +476,7 @@ export function processUpdateQueue<State>(
   hasForceUpdate = false;
 
   if (__DEV__) {
+    // $FlowFixMe[escaped-generic] discovered when updating Flow
     currentlyProcessingQueue = queue.shared;
   }
 

packages/react-reconciler/src/ReactFiberClassUpdateQueue.old.js

@@ -476,6 +476,7 @@ export function processUpdateQueue<State>(
   hasForceUpdate = false;
 
   if (__DEV__) {
+    // $FlowFixMe[escaped-generic] discovered when updating Flow
     currentlyProcessingQueue = queue.shared;
   }
 

packages/react-reconciler/src/ReactFiberHooks.new.js

@@ -160,7 +160,7 @@ export type Effect = {
   tag: HookFlags,
   create: () => (() => void) | void,
   destroy: (() => void) | void,
-  deps: Array<mixed> | null,
+  deps: Array<mixed> | void | null,
   next: Effect,
 };
 
@@ -1539,7 +1539,7 @@ function updateStoreInstance<T>(
   }
 }
 
-function subscribeToStore(fiber, inst, subscribe) {
+function subscribeToStore<T>(fiber, inst: StoreInstance<T>, subscribe) {
   const handleStoreChange = () => {
     // The store changed. Check if the snapshot changed since the last time we
     // read from the store.
@@ -1552,7 +1552,7 @@ function subscribeToStore(fiber, inst, subscribe) {
   return subscribe(handleStoreChange);
 }
 
-function checkIfSnapshotChanged(inst) {
+function checkIfSnapshotChanged<T>(inst: StoreInstance<T>): boolean {
   const latestGetSnapshot = inst.getSnapshot;
   const prevValue = inst.value;
   try {
@@ -1609,7 +1609,7 @@ function rerenderState<S>(
   return rerenderReducer(basicStateReducer, (initialState: any));
 }
 
-function pushEffect(tag, create, destroy, deps) {
+function pushEffect(tag, create, destroy, deps: Array<mixed> | void | null) {
   const effect: Effect = {
     tag,
     create,
@@ -1728,7 +1728,12 @@ function updateRef<T>(initialValue: T): {current: T} {
   return hook.memoizedState;
 }
 
-function mountEffectImpl(fiberFlags, hookFlags, create, deps): void {
+function mountEffectImpl(
+  fiberFlags,
+  hookFlags,
+  create,
+  deps: Array<mixed> | void | null,
+): void {
   const hook = mountWorkInProgressHook();
   const nextDeps = deps === undefined ? null : deps;
   currentlyRenderingFiber.flags |= fiberFlags;
@@ -1740,7 +1745,12 @@ function mountEffectImpl(fiberFlags, hookFlags, create, deps): void {
   );
 }
 
-function updateEffectImpl(fiberFlags, hookFlags, create, deps): void {
+function updateEffectImpl(
+  fiberFlags,
+  hookFlags,
+  create,
+  deps: Array<mixed> | void | null,
+): void {
   const hook = updateWorkInProgressHook();
   const nextDeps = deps === undefined ? null : deps;
   let destroy = undefined;
@@ -2395,7 +2405,7 @@ function entangleTransitionUpdate<S, A>(
   }
 }
 
-function markUpdateInDevTools(fiber, lane, action) {
+function markUpdateInDevTools<A>(fiber, lane, action: A) {
   if (__DEV__) {
     if (enableDebugTracing) {
       if (fiber.mode & DebugTracingMode) {
@@ -2490,6 +2500,7 @@ const HooksDispatcherOnMount: Dispatcher = {
 if (enableCache) {
   (HooksDispatcherOnMount: Dispatcher).getCacheSignal = getCacheSignal;
   (HooksDispatcherOnMount: Dispatcher).getCacheForType = getCacheForType;
+  // $FlowFixMe[escaped-generic] discovered when updating Flow
   (HooksDispatcherOnMount: Dispatcher).useCacheRefresh = mountRefresh;
 }
 if (enableUseHook) {