reactjs - Create-React-App 编译失败 |导入/第一次错误

Question

我目前正在为我的个人网站使用 Create-React-App。每次运行时我都会收到以下错误:

./src/~/react-router-dom/es/index.js
 Line 3:   Import in body of module; reorder to top  import/first
 Line 5:   Import in body of module; reorder to top  import/first
 Line 7:   Import in body of module; reorder to top  import/first
 Line 9:   Import in body of module; reorder to top  import/first
 Line 11:  Import in body of module; reorder to top  import/first
 Line 13:  Import in body of module; reorder to top  import/first
 Line 15:  Import in body of module; reorder to top  import/first
 Line 17:  Import in body of module; reorder to top  import/first
 Line 19:  Import in body of module; reorder to top  import/first
 Line 21:  Import in body of module; reorder to top  import/first
 Line 23:  Import in body of module; reorder to top  import/first
 Line 25:  Import in body of module; reorder to top  import/first

我确实觉得我错过了一些非常小的东西，但我很难弄清楚。我尝试用谷歌搜索错误关键字“import/first”，这让我认为这是一个 ESLint 问题。如果您发现我的进口订单有任何问题，请告诉我。我尝试了不同的导入订单，但似乎没有什么可以消除该错误。

import React from 'react';
import ReactDOM from 'react-dom';
import { createBrowserHistory } from 'history';
import { Router, Route, Redirect, Switch } from 'react-router-dom';
import './index.css'; 
import App from './App.js';
import Home from './home.js';
import About from './about.js';
import Contact from './contact.js';
import NotFound from './404.js';

import registerServiceWorker from './registerServiceWorker';

const history = createBrowserHistory();

ReactDOM.render(
    <Router history={history}>
        <App>
            <Switch>
                <Route exact path="/" component= {Home} />
                <Route path="/about" component= {About} />
                <Route path="/contact" component= {Contact} />
                <Route path="/404" component= {NotFound} />
                <Redirect to= "/404" />
            </Switch>
        </App>
    </Router>,
    document.getElementById('root')
);
registerServiceWorker();

Answer 1

这是因为你不小心将 React Router 安装到 src文件夹。因此 linter 认为这是您的代码并尝试验证它。 不要在src内安装第三方依赖项.

删除src/node_modules并运行npm install在您的应用程序的根文件夹中。如果缺少某个包，请运行 npm install --save <package-name> ，也在根文件夹中。