work-timer/app/entry.client.tsx

import { RemixBrowser } from '@remix-run/react';
import { startTransition, StrictMode } from 'react';
import { hydrateRoot } from 'react-dom/client';
import { ClientProvider } from '@mantine/remix';

function hydrate() {
  startTransition(() => {
    hydrateRoot(
      document,
      <StrictMode>
        <ClientProvider>
          <RemixBrowser />
        </ClientProvider>
      </StrictMode>
    );
  });
}

if (typeof requestIdleCallback === 'function') {
  requestIdleCallback(hydrate);
} else {
  // Safari doesn't support requestIdleCallback
  // https://caniuse.com/requestidlecallback
  setTimeout(hydrate, 1);
}