CLI移动到一个单独的包中:webpack-cli

Question

CLI移动到一个单独的包中:webpack-cli

pra*_*mar 16 javascript php node.js reactjs webpack

我是React.js的新手,我正在尝试从tutorialspoint的教程中学习,但我遇到了错误.执行npm start命令时,控制台上出现以下错误:

C:\Users\HP\Desktop\reactApp1> npm start
> reactapp1@1.0.0 start C:\Users\HP\Desktop\reactApp1.
> webpack-dev-server --hot

The CLI moved into a separate package: webpack-cli. 
Please install .webpack-cli. in addition to webpack itself to use the CLI.
-> When using npm: npm install webpack-cli -D 
-> When using yarn: yarn add webpack-cli -D 
module.js:540
    throw err; 

Error: Cannot find module .webpack-cli/bin/config-yargs. 
    at Function.Module._resolveFilenam (module.js:538:15) 
    at Function.Module. load (module.j5:668:25) 
    at Module.require (module.js,587.17) 
    at require (internal/module.js:11:18) 
    at Object•<anonymous> (C:\Users\HP\Desktop\reactApp1\node_modules\webpack-dev-server\bin\webpack-dev-server.js:65:1) 

    at Module. compile (module.js:663:30) 
    at Object.Module. extensions. .js (module.js:656:10) 
    at Module.load (module.js:556:32) 
    at tryModuleLoad (module.js:699:12) 
    at Function.Module. load (modul.js:691:3) 
  npm ERR! code ELIFECYCLE 
  npm ERR! errno 1 
  npm ERR! reactapp@1.0.0 start: `webpack-dev-server --hot`
  npm ERR! Exit status 1
  npm ERR!
  npm ERR! Failed at the reactapp@1.0.0 start script. 
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  npm ERR! A complete log of this run can be found in:
  npm ERR!     C:Users\HP\AppData\Roaming\npm-cache\_logs\2018-03-06T05_29_08_833Z-debug.log

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的package.json

     {
      "name": "reactapp1",
      "version": "1.0.0",
      "description": "",
      "main": "index.js",
      "scripts": {
        "start": "webpack-dev-server --hot"
      },
      "author": "",
      "license": "ISC",
      "dependencies": {
        "babel-core": "^6.26.0",
        "babel-preset-es2015": "^6.24.1",
        "babel-preset-react": "^6.24.1",
        "react": "^16.2.0",
        "react-dom": "^16.2.0",
        "webpack": "^4.0.1",
        "webpack-dev-server": "^3.1.0"
      },
      "devDependencies": {
        "babel-loader": "^7.1.3"
      }
    }

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webpack.config.js

var config = {
    entry: './main.js',
    output: {
        path:'./',
        filename: 'index.js',
    },
    devServer: {
        inline: true,
        port: 8090
    },
    module: {
        loaders: [
            {
                test: /\.jsx?$/,
                exclude: /node_modules/,
                loader: 'babel',
                query: {
                    presets: ['es2015', 'react']
                }
            }
        ]
    }
}
module.exports = config;

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main.js

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.jsx';
ReactDOM.render(<App />, document.getElementById('app'));

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App.jsx

import React from 'react';
class App extends React.Component {
    render() {
        return (
            <div>
                Hello World!!!
            </div>
        );
    }
}
export default App;

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的index.html

<!DOCTYPE html>
<html lang = "en">
<head>
    <meta charset = "UTF-8">
    <title>React App</title>
</head>
<body>
<div id = "app"></div>
<script src = "index.js"></script>
</body>
</html>

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Answer 1

Rit*_*ito 17

我经历了同样的例子并遇到了同样的问题.所以按照上面的答案,我首先运行这个命令 -

npm install -g webpack-cli --save-dev

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什么也没发生,仍然面临同样的问题.

然后我跑了这个命令 -

npm install webpack-cli --save-dev

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这个问题已经解决,但我又遇到了另一个错误.

事实证明,在新的Webpack版本中,他们也改变了模块属性.所以你需要在webpack.config.js文件中进行更改.

module: {
        rules: [
          {
             test: /\.jsx?$/,
             exclude: /node_modules/,
             loader: 'babel-loader',
             query: {
                presets: ['es2015', 'react']
             }
          }
        ]
   }

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所以基本上加载器被模块对象内的规则所取代.

我做了这个改变,它对我有用.