webpack.config.js

const path = require('path');
const HtmlWebPackPlugin = require('html-webpack-plugin');

module.exports = {
    entry: path.join(__dirname, 'demo/index.jsx'),
    output: {
        path: path.join(__dirname, 'dist'),
        filename: 'bundle.js'
    },
    module: {
        rules: [
            {
                test: /\.(js|jsx)$/,
                use: 'babel-loader',
                exclude: '/node_modules'
            },
            {
                test: /\.(css|scss)$/,
                use: ['style-loader', 'css-loader', 'sass-loader']
            }
        ]
    },

    plugins: [
        new HtmlWebPackPlugin({
            template: path.join(__dirname, 'demo/index.html')
        })
    ],
    resolve: {
        extensions: ['.js', '.jsx']
    },
    devServer: {
        port: 8000,
        disableHostCheck: true
    }
}