import React, {memo} from 'react'; import {createStyles, makeStyles, Theme} from '@material-ui/core/styles'; import AppBar from '@material-ui/core/AppBar'; import Toolbar from '@material-ui/core/Toolbar'; import Typography from '@material-ui/core/Typography'; const useStyles = makeStyles((theme: Theme) => createStyles({ root: { flexGrow: 1, }, menuButton: { marginRight: theme.spacing(2), }, title: { flexGrow: 1, }, }), ); const TopMenu: React.FC = () => { const classes = useStyles(); return (