javascript - webpack error report newbie solution

Question

And webpack configuration

package.json

{
  "name": "flower",
  "version": "0.0.0",
  "private": true,
  "scripts": {
    "start": "node ./bin/www"
  },
  "dependencies": {
    "antd": "^2.11.2",
    "body-parser": "~1.17.1",
    "cookie-parser": "~1.4.3",
    "debug": "~2.6.3",
    "express": "~4.15.2",
    "jade": "~1.11.0",
    "morgan": "~1.8.1",
    "react": "^15.6.1",
    "react-dom": "^15.6.1",
    "react-redux": "^5.0.5",
    "react-router": "^4.1.1",
    "redux": "^3.7.1",
    "serve-favicon": "~2.4.2",
    "session": "^0.1.0"
  },
  "devDependencies": {
    "babel-core": "^6.25.0",
    "babel-loader": "^7.1.1",
    "babel-preset-es2015": "^6.24.1",
    "webpack": "^2.2.1"
  }
}

main.js code

import React from "react";
import ReactDOM from "react-dom";
// import {Route,Router,IndexRoute,hashHistory} from "react-router";
// import {Provider} from "react-redux";
//import store from "store";


// class Test extends React.Component{
//          constructor(props){
//             super(props);
//         }
//         render(){
//              return (<p> hello word </p>)
//         }    
//   }


ReactDOM.render(
     <h1> hello word! </h1>,
     document.getElementById('app')
);

Answer 1

//第一步
npm install --save-dev babel-preset-react

//第二步，再在presets中添加react

presets: ['es2015', 'react']

Also, let me say one more thing, most of the configuration items you use are 1 and exist only for compatibility.

For webpack2 or webpack3 related configuration, you can go to the official website to learn by yourself: https://doc.webpack-china.org...

Answer 2

This is not an error of webpack, it’s a problem with your code

ReactDom.render(
<h1>hello world!</h1>,
document.getElementById('app')
)

The first parameter of ReactDom.render here should be the React.Component object