Improve flagging of React.cache to remove indirection in bundled co…

…de (#28263)

Uses a better technique for conditionally disabling cache on the client

packages/react/src/ReactCacheClient.js

@@ -10,25 +10,25 @@
 import {disableClientCache} from 'shared/ReactFeatureFlags';
 import {cache as cacheImpl} from './ReactCacheImpl';
 
-export function cache<A: Iterable<mixed>, T>(fn: (...A) => T): (...A) => T {
-  if (disableClientCache) {
-    // On the client (i.e. not a Server Components environment) `cache` has
-    // no caching behavior. We just return the function as-is.
-    //
-    // We intend to implement client caching in a future major release. In the
-    // meantime, it's only exposed as an API so that Shared Components can use
-    // per-request caching on the server without breaking on the client. But it
-    // does mean they need to be aware of the behavioral difference.
-    //
-    // The rest of the behavior is the same as the server implementation — it
-    // returns a new reference, extra properties like `displayName` are not
-    // preserved, the length of the new function is 0, etc. That way apps can't
-    // accidentally depend on those details.
-    return function () {
-      // $FlowFixMe[incompatible-call]: We don't want to use rest arguments since we transpile the code.
-      return fn.apply(null, arguments);
-    };
-  } else {
-    return cacheImpl(fn);
-  }
+export function noopCache<A: Iterable<mixed>, T>(fn: (...A) => T): (...A) => T {
+  // On the client (i.e. not a Server Components environment) `cache` has
+  // no caching behavior. We just return the function as-is.
+  //
+  // We intend to implement client caching in a future major release. In the
+  // meantime, it's only exposed as an API so that Shared Components can use
+  // per-request caching on the server without breaking on the client. But it
+  // does mean they need to be aware of the behavioral difference.
+  //
+  // The rest of the behavior is the same as the server implementation — it
+  // returns a new reference, extra properties like `displayName` are not
+  // preserved, the length of the new function is 0, etc. That way apps can't
+  // accidentally depend on those details.
+  return function () {
+    // $FlowFixMe[incompatible-call]: We don't want to use rest arguments since we transpile the code.
+    return fn.apply(null, arguments);
+  };
 }
+
+export const cache: typeof noopCache = disableClientCache
+  ? noopCache
+  : cacheImpl;