Enable React's default transition indicator

Author: eps1lon

packages/next/src/client/app-index.tsx

@@ -29,11 +29,6 @@ import { isBot } from '../shared/lib/router/utils/is-bot'
 
 /// <reference types="react-dom/experimental" />
 
-function onDefaultTransitionIndicator() {
-  // TODO: Compose default with user-configureable (e.g. nprogress)
-  // TODO: Use React's default even if user config isn't set up. Requires resolution of https://issues.chromium.org/u/1/issues/419746417
-}
-
 const appElement: HTMLElement | Document = document
 
 const encoder = new TextEncoder()
@@ -213,8 +208,9 @@ function Root({ children }: React.PropsWithChildren<{}>) {
 }
 
 const reactRootOptions: ReactDOMClient.RootOptions = {
+  // // TODO: Compose default with user-configureable (e.g. nprogress)
   // @ts-expect-error: Should pass on `@types/react` bump.
-  onDefaultTransitionIndicator,
+  onDefaultTransitionIndicator: undefined,
   onRecoverableError,
   onCaughtError,
   onUncaughtError,