The library for web and native user interfaces.
fix[devtools/useMemoCache]: add stub for useMemoCache in ReactDebugHook (#27472)
Currently, we have this error in our logs of the internal version of React DevTools: ``` TypeError: Cannot read properties of undefined (reading 'memoCache') at Proxy.useMemoCache (chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/react_devtools_backend_compact.js:151:71) ``` Looking at the build files of the extension, it fails here: https://github.com/facebook/react/blob/dddfe688206dafa5646550d351eb9a8e9c53654a/packages/react-debug-tools/src/ReactDebugHooks.js#L333-L337 Looks like `updateQueue` can be `undefined`, as it is not defined in hook object here: https://github.com/facebook/react/blob/dddfe688206dafa5646550d351eb9a8e9c53654a/packages/react-reconciler/src/ReactFiberHooks.js#L180-L186 ~~Also, it looks like `useMemoCache` implementation doesn't expect this, so it should also result into TypeError here, line 1114:~~ https://github.com/facebook/react/blob/dddfe688206dafa5646550d351eb9a8e9c53654a/packages/react-reconciler/src/ReactFiberHooks.js#L1108-L1115 ~~Should this also be updated?~~
Ruslan Lesiutin committed
Oct 17, 2023 at 18:39 UTC
a4195750779dbd9a13e1615fbbd493bf2c5768ca
4 files changed
+17
-47
packages/react-debug-tools/src/ReactDebugHooks.js
+6
-41
@@ -48,19 +48,9 @@ type Dispatch<A> = A => void;
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let primitiveStackCache: null | Map<string, Array<any>> = null;
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-type MemoCache = {
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- data: Array<Array<any>>,
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- index: number,
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-};
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-
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-type FunctionComponentUpdateQueue = {
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- memoCache?: MemoCache | null,
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-};
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-
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type Hook = {
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memoizedState: any,
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next: Hook | null,
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- updateQueue: FunctionComponentUpdateQueue | null,
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};
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function getPrimitiveStackCache(): Map<string, Array<any>> {
@@ -327,36 +317,11 @@ function useId(): string {
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return id;
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}
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+// useMemoCache is an implementation detail of Forget's memoization
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+// it should not be called directly in user-generated code
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+// we keep it as a stub for dispatcher
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function useMemoCache(size: number): Array<any> {
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- const hook = nextHook();
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- let memoCache: MemoCache;
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- if (
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- hook !== null &&
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- hook.updateQueue !== null &&
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- hook.updateQueue.memoCache != null
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- ) {
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- memoCache = hook.updateQueue.memoCache;
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- } else {
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- memoCache = {
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- data: [],
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- index: 0,
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- };
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- }
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-
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- let data = memoCache.data[memoCache.index];
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- if (data === undefined) {
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- const MEMO_CACHE_SENTINEL = Symbol.for('react.memo_cache_sentinel');
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- data = new Array(size);
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- for (let i = 0; i < size; i++) {
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- data[i] = MEMO_CACHE_SENTINEL;
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- }
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- }
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- hookLog.push({
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- primitive: 'MemoCache',
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- stackError: new Error(),
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- value: data,
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- });
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- return data;
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+ return [];
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}
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const Dispatcher: DispatcherType = {
@@ -725,7 +690,7 @@ export function inspectHooks<Props>(
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renderFunction: Props => React$Node,
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props: Props,
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currentDispatcher: ?CurrentDispatcherRef,
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- includeHooksSource?: boolean = false,
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+ includeHooksSource: boolean = false,
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): HooksTree {
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// DevTools will pass the current renderer's injected dispatcher.
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// Other apps might compile debug hooks as part of their app though.
@@ -816,7 +781,7 @@ function resolveDefaultProps(Component: any, baseProps: any) {
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export function inspectHooksOfFiber(
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fiber: Fiber,
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currentDispatcher: ?CurrentDispatcherRef,
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- includeHooksSource?: boolean = false,
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+ includeHooksSource: boolean = false,
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): HooksTree {
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// DevTools will pass the current renderer's injected dispatcher.
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// Other apps might compile debug hooks as part of their app though.
packages/react-debug-tools/src/__tests__/ReactHooksInspectionIntegration-test.js
+2
-6
@@ -634,7 +634,7 @@ describe('ReactHooksInspectionIntegration', () => {
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});
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// @gate enableUseMemoCacheHook
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- it('should support useMemoCache hook', () => {
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+ it('useMemoCache should not be inspectable', () => {
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function Foo() {
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const $ = useMemoCache(1);
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let t0;
@@ -653,11 +653,7 @@ describe('ReactHooksInspectionIntegration', () => {
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const childFiber = renderer.root.findByType(Foo)._currentFiber();
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const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);
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- expect(tree.length).toEqual(1);
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- expect(tree[0].isStateEditable).toBe(false);
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- expect(tree[0].name).toBe('MemoCache');
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- expect(tree[0].value).toHaveLength(1);
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- expect(tree[0].value[0]).toEqual(<div>{1}</div>);
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+ expect(tree.length).toEqual(0);
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});
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describe('useDebugValue', () => {
packages/react-devtools-shell/src/app/InspectableElements/InspectableElements.js
+2
@@ -18,6 +18,7 @@ import EdgeCaseObjects from './EdgeCaseObjects.js';
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import NestedProps from './NestedProps';
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import SimpleValues from './SimpleValues';
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import SymbolKeys from './SymbolKeys';
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+import UseMemoCache from './UseMemoCache';
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// TODO Add Immutable JS example
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@@ -34,6 +35,7 @@ export default function InspectableElements(): React.Node {
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<EdgeCaseObjects />
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<CircularReferences />
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<SymbolKeys />
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+ <UseMemoCache />
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</Fragment>
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);
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}
packages/react-devtools-shell/src/app/InspectableElements/UseMemoCache.js
new
+7
@@ -0,0 +1,7 @@
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+import * as React from 'react';
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+
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+export default function UseMemoCache(): React.Node {
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+ React.unstable_useMemoCache(1);
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+
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+ return null;
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+}