Improved dev experience when DevTools hook is disabled

packages/react-refresh/src/ReactFreshRuntime.js

@@ -464,7 +464,13 @@ export function injectIntoGlobalHook(globalObject: any): void {
         onCommitFiberUnmount() {},
       };
     }
-
+    // Checks if DevTools hook is disabled
+    if (hook.isDisabled) {
+      console['warn'](
+        'Something has shimmed the React DevTools global hook (REACT_DEVTOOLS_GLOBAL_HOOK).' +
+          'Fast Refresh is not compatible with this shim and will be disabled.  ',
+      );
+    }
     // Here, we just want to get a reference to scheduleRefresh.
     const oldInject = hook.inject;
     hook.inject = function(injected) {