javascript source code of Header

import React from "react";
import {
  Typography,
  FormControl,
  InputLabel,
  Select,
  MenuItem,
  AppBar,
  Toolbar,
} from "@material-ui/core";

import langUtil from "../../modules/lang/lang-util";

const Header = ({ user, onLanguageSelect, lang, langCode, classes }) => {
  const handleLanguageChange = (e) => {
    onLanguageSelect(e.target.value);
  };

  const renderLanguageSelector = () => {
    const supportedLanguages = langUtil.getSupportedLanguages(lang);

    return (
      <div>
        <InputLabel shrink>Language:</InputLabel>
        <FormControl
          style={{
            width: "100%",
          }}
          size="small"
        >
          <Select value={langCode} onChange={handleLanguageChange}>
            {supportedLanguages.map((s, index) => (
              <MenuItem key={index} value={s.value}>
                <Typography>{s.label}</Typography>
              </MenuItem>
            ))}
          </Select>
        </FormControl>
      </div>
    );
  };

  // <img src="/Flag.png" style={{ verticalAlign: 'middle', marginRight: 10 }} alt="flag"/>

  return (
    <AppBar
      position="static"
      style={{
        color: "white",
        backgroundColor: "#0040B7",
        justifyContent: "middle",
      }}
    >
      <Toolbar variant="dense">
        <Typography variant="h6" style={{ flexGrow: 1 }}>
          {lang.t("headerTitle")}
        </Typography>
        {renderLanguageSelector()}
      </Toolbar>
    </AppBar>
  );
};

export default Header;