Question

我正在docker容器中运行REST API。我正在构建页面，并且在启动服务器时得到：

Starting the development server...

Failed to compile.

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

刷新浏览器时，出现以下错误Error: Cannot find module 'react-router-dom' 我已经尝试了所有可以找到的npm安装，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();

非常感谢您的帮助！

Answer 1

您可能错过了：

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

AND ，因为使用Docker 拖放图像并重新创建它们。这样就解决了问题。
如果不执行以下操作：

运行npm install react-router-dom（或者，如果使用的是Yarn，则用yarn添加react-router-dom）。
然后检查导入是否引用了程序包名称，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();

重新启动开发服务器
检查您是否进行过npm i react react-dom react-router-dom

请提供反馈（评论）解决您问题的方法，然后将此答案标记为已接受

Answer 2

您尝试重新安装npm是因为有时npm版本不符合库要求

Answer 3

因为它正在Docker中运行。

我不得不使用命令make install dev

这似乎可以解决所有问题

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

3 个答案: