next.js/turbopack/benchmark-apps/mui/components/ModeSwitch.tsx

'use client'
import * as React from 'react'
import Box from '@mui/material/Box'
import FormControl from '@mui/material/FormControl'
import InputLabel from '@mui/material/InputLabel'
import MenuItem from '@mui/material/MenuItem'
import Select from '@mui/material/Select'
import { useColorScheme } from '@mui/material/styles'

export default function ModeSwitch() {
  const { mode, setMode } = useColorScheme()
  if (!mode) {
    return null
  }
  return (
    <Box
      sx={{
        display: 'flex',
        justifyContent: 'flex-end',
        mt: 1,
        p: 1,
      }}
    >
      <FormControl>
        <InputLabel id="mode-select-label">Theme</InputLabel>
        <Select
          labelId="mode-select-label"
          id="mode-select"
          value={mode}
          onChange={(event) => setMode(event.target.value as typeof mode)}
          label="Theme"
        >
          <MenuItem value="system">System</MenuItem>
          <MenuItem value="light">Light</MenuItem>
          <MenuItem value="dark">Dark</MenuItem>
        </Select>
      </FormControl>
    </Box>
  )
}