anvil/striker-ui/pages/_app.tsx

import { AppProps } from 'next/app';
import { ThemeProvider } from '@mui/material';
import { CacheProvider, EmotionCache } from '@emotion/react';

import createEmotionCache from '../lib/create_emotion_cache/createEmotionCache';
import theme from '../theme';
import '../styles/globals.css';

const clientSideEmotionCache = createEmotionCache();

interface MyAppProps extends AppProps {
  // eslint-disable-next-line react/require-default-props
  emotionCache?: EmotionCache;
}

const App = ({
  Component,
  emotionCache = clientSideEmotionCache,
  pageProps,
}: MyAppProps): JSX.Element => (
  <CacheProvider value={emotionCache}>
    <ThemeProvider theme={theme}>
      <Component
        // eslint-disable-next-line react/jsx-props-no-spreading
        {...pageProps}
      />
    </ThemeProvider>
  </CacheProvider>
);

export default App;