Styjun

I am trying to understand how React, Babel and Webpack interact with each other, but I get the following error: Uncaught TypeError: Super expression must either be null or a function. The CSS is rendering just fine but the HTML isn't, though I was able to see it in the console (view image below).
Any suggestions?

package.json

 "name": "react-raw",
 "version": "1.0.0",
 "description": "",
 "main": "index.js",
 "babel": 
 "presets": [
 "@babel/preset-env",
 "@babel/preset-react"
 ]
 ,
 "scripts": 
 "start": "webpack-dev-server --open"
 ,
 "keywords": [],
 "author": "",
 "license": "ISC",
 "dependencies": 
 "react": "^16.8.4",
 "react-dom": "^16.8.4"
 ,
 "devDependencies": 
 "@babel/core": "^7.4.0",
 "@babel/preset-env": "^7.4.1",
 "@babel/preset-react": "^7.0.0",
 "babel-loader": "^8.0.5",
 "css-loader": "^2.1.1",
 "html-webpack-plugin": "^3.2.0",
 "style-loader": "^0.23.1",
 "webpack": "^4.29.6",
 "webpack-cli": "^3.3.0",
 "webpack-dev-server": "^3.2.1"
 

index.js

var React = require("react");
var ReactDOM = require("react-dom");

require("./index.css");

class App extends React.Component() 
 render() 
 return <div>Hello Christian!!</div>;
 


ReactDOM.render(<App />, document.getElementById("app"));

webpack.config.js

const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin"); //installed via npm
//const webpack = require("webpack"); //to access built-in plugins

module.exports = 
 entry: "./app/index.js",
 output: 
 path: path.resolve(__dirname, "dist"),
 filename: "index_bundle.js"
 ,
 module: 
 rules: [
 test: /.(js)$/, use: "babel-loader" ,
 test: /.css$/, use: ["style-loader", "css-loader"] 
 ]
 ,
 mode: "development",
 plugins: [new HtmlWebpackPlugin( template: "app/index.html" )]
;

index.html

<!DOCTYPE html>
<html lang="en">
 <head>
 <meta charset="UTF-8" />
 <meta name="viewport" content="width=device-width, initial-scale=1.0" />
 <meta http-equiv="X-UA-Compatible" content="ie=edge" />
 <title>React Raw</title>
 </head>
 <body>
 <div id="app"></div>
 </body>
</html>

Your problem is with the signature of your class component:

class App extends React.Component() 
 render() 
 return <div>Hello Christian!!</div>;
 

This is how you need to declare it:

class App extends React.Component
 render() 
 return <div>Hello Christian!!</div>;
 

Note the extra () i omitted

You can read more about classes in here