Add useRefresh hook to react-debug-tools (#20460)

Brian Vaughn · web-flow · commit 27659559ebfd · 2021-01-04T10:46:20.000-05:00
diff --git a/packages/react-debug-tools/src/ReactDebugHooks.js b/packages/react-debug-tools/src/ReactDebugHooks.js
@@ -73,6 +73,10 @@ function getPrimitiveStackCache(): Map<string, Array<any>> {
       Dispatcher.useState(null);
       Dispatcher.useReducer((s, a) => s, null);
       Dispatcher.useRef(null);
+      if (typeof Dispatcher.useCacheRefresh === 'function') {
+        // This type check is for Flow only.
+        Dispatcher.useCacheRefresh();
+      }
       Dispatcher.useLayoutEffect(() => {});
       Dispatcher.useEffect(() => {});
       Dispatcher.useImperativeHandle(undefined, () => null);
@@ -171,6 +175,16 @@ function useRef<T>(initialValue: T): {|current: T|} {
   return ref;
 }
 
+function useCacheRefresh(): () => void {
+  const hook = nextHook();
+  hookLog.push({
+    primitive: 'CacheRefresh',
+    stackError: new Error(),
+    value: hook !== null ? hook.memoizedState : function refresh() {},
+  });
+  return () => {};
+}
+
 function useLayoutEffect(
   create: () => (() => void) | void,
   inputs: Array<mixed> | void | null,
@@ -305,6 +319,7 @@ function useOpaqueIdentifier(): OpaqueIDType | void {
 const Dispatcher: DispatcherType = {
   getCacheForType,
   readContext,
+  useCacheRefresh,
   useCallback,
   useContext,
   useEffect,
