Javascript 分析错误：意外的标记&引用；在基本react.js文件中的EOF

在编译一个简单的react应用程序时，我在文件的最后一行（空白）出现了一个错误，上面写着“Unexpected Token”

import { Link, Redirect } from "react-router-dom";
import './App.css';


class Companies extends Component {
    constructor(props) {
        super(props);
        var user = null;
        if (props.hasOwnProperty("user")){
            user = props["user"];
        }
        this.state = {
            user: user,
            companies: [],
        };
    }

}

export Companies

是我试图运行的代码

Failed to compile.

./src/Companies.js
  Line 22:1:  Parsing error: Unexpected token

  20 |
  21 | export Companies
> 22 |
     | ^

---

是我收到的错误消息。

要导出类，正确的语法是：

导出默认类

试试这个：

import { Link, Redirect } from "react-router-dom";
import './App.css';


class Companies extends Component {
    constructor(props) {
        super(props);
        var user = null;
        if (props.hasOwnProperty("user")){
            user = props["user"];
        }
        this.state = {
            user: user,
            companies: [],
        };
    }

}

export default Companies