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我是 React.js 的新手，我正在尝试从 tutorialspoint 上的教程中学习，但我遇到了错误。这是我执行 npm start 命令时控制台上的错误：
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
包.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"
}
}
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;
主程序
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.jsx';
ReactDOM.render(<App />, document.getElementById('app'));
应用程序.jsx
import React from 'react';
class App extends React.Component {
render() {
return (
<div>
Hello World!!!
</div>
);
}
}
export default App;
索引.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>
原文由 prakash kumar 发布，翻译遵循 CC BY-SA 4.0 许可协议
我经历了同样的例子并面临同样的问题。所以按照上面的答案我首先运行了这个命令 -
什么也没发生，仍然面临同样的问题。
然后我运行了这个命令 -
问题已解决，但我遇到了另一个错误。
事实证明，在新的 Webpack 版本中，他们还更改了模块属性。所以你还需要在 webpack.config.js 文件中进行更改。
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。
希望它能帮助其他正在学习本教程的人。
为了解决
Invalid configuration object问题，我参考了这个答案。 https://stackoverflow.com/a/42482079/5892553