javascript source code of RootLayout

import React from 'react';
import { Helmet } from 'react-helmet';
import CssBaseline from '@material-ui/core/CssBaseline';
import { ThemeProvider } from '@material-ui/core/styles';
import theme from '../theme';

export default function RootLayout(props) {
  return (
    <React.Fragment>
      <Helmet>
        <meta charSet="UTF-8" />
        <meta name="theme-color" content="#f8f8f8" />
        <meta
          name="viewport"
          content="width=device-width, initial-scale=1.0, user-scalable=no"
        />
        <meta name="mobile-web-app-capable" content="yes" />
        <meta name="apple-mobile-web-app-capable" content="yes" />
        <meta httpEquiv="X-UA-Compatible" content="ie=edge" />
      </Helmet>
      <ThemeProvider theme={theme}>
        {/* CssBaseline kickstart an elegant, consistent, and simple baseline to build upon. */}
        <CssBaseline />
        {props.children}
      </ThemeProvider>
    </React.Fragment>
  );
}