反应：找不到模块：无法解析“/usr/src/app/src”中的“react-router-dom”

Question

我在 docker 容器中运行 REST API 。 我正在构建页面，当我启动服务器时，我得到：

Starting the development server...

Failed to compile.

./src/App.js
Module not found: Can't resolve 'react-router-dom' in '/usr/src/app/src'

当我刷新浏览器时，我看到以下错误Error: Cannot find module 'react-router-dom' I've tried every npm install 我能找到，因为这似乎是每个人的问题：

npm install -S react-router-dom
npm install react-router-dom --save
npm i react-router-dom --save

在 package.json 中，我看到了依赖项：

{
  "name": "app",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^9.5.0",
    "@testing-library/user-event": "^7.2.1",
    "bootstrap": "^4.4.1",
    "react": "^16.13.1",
    "react-bootstrap": "^1.0.0",
    "react-dom": "^16.13.1",
    "react-router-dom": "^5.1.2",
    "react-scripts": "3.4.1",
    "styled-components": "^5.1.0"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  }
}

我的 app.js 文件：

import React, { Component } from 'react';
import { BrowserRouter as Router, Route, Switch } from 'react-router-dom';
import { Home } from './Home';
import { Developers } from './Developers';
import { Pricing } from './Pricing';
import { Login } from './Login';
import { NoMatch } from './NoMatch';

class App extends Component {
  render() {
    return (
      <React.Fragment>
        <Router>
          <Switch>
            <Route exact path = "/" component={Home} />
            <Route path="/developers" component = {Developers} />
            <Route path="/pricing" component = {Pricing} />
            <Route path="/login" component = {Login} />
            <Route component={NoMatch} /> 
          </Switch>
        </Router>
      </React.Fragment>
    );
  }
}


export default App;

我的 index.js 文件

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import * as serviceWorker from './serviceWorker';
import { BrowserRouter as Router } from 'react-router-dom';

ReactDOM.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>,
  document.getElementById('root')
);

// If you want your app to work offline and load faster, you can change
// unregister() to register() below. Note this comes with some pitfalls.

serviceWorker.unregister();

任何帮助是极大的赞赏！

Answer 1

你可能错过了：

  import { BrowserRouter as Router, Route } from 'react-router-dom';

并且因为使用 Docker删除您的图像并重新创建它们。 这解决了问题。
如果没有，请执行以下操作：

• 运行 npm install react-router-dom （如果你使用 Yarn，则运行 yarn add react-router-dom）。
• 然后检查导入是否引用了 package 名称，而不是路径（即，它应该是 require('react-router-dom')，而不是 require('./react-router-dom')）

• index.js 应该是这样的

  import React from 'react'; import ReactDOM from 'react-dom'; import './index.css'; import App from './App'; import * as serviceWorker from './serviceWorker'; import { BrowserRouter as Router } from 'react-router-dom'; ReactDOM.render(, document.getElementById('root')); serviceWorker.unregister();

• 重启开发服务器

• 检查你是否做了npm i react react-dom react-router-dom

请提供反馈（评论）是什么解决了您的问题并将此答案标记为已接受

Answer 2

您是否尝试重新安装 npm 因为有时 npm 版本不符合库要求

Answer 3

因为这是在 Docker 中运行的。

我不得不命令make install dev

这似乎解决了一切