loading.jsA loading file can create instant loading states built on Suspense.
By default, this file is a Server Component - but can also be used as a Client Component through the "use client" directive.
app/feed/loading.tsx export default function Loading() {
  // Or a custom loading skeleton component
  return <p>'Loading...'</p>
}
Loading UI components do not accept any parameters.
Good to know
While designing loading UI, you may find it helpful to use the React Developer Tools to manually toggle Suspense boundaries.
Version History
VersionChangesv13.0.0loading introduced.