webpack.common.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');

module.exports = {
    entry: {
        app: './src/index.js'
    },
    plugins: [
        new CleanWebpackPlugin(['dist']),
        new HtmlWebpackPlugin({
            title: 'Production',
            template: './src/template.html',
            filename: 'index.html'
        })
    ],
    output: {
        filename: '[name].bundle.js',
        path: path.resolve(__dirname, 'dist')
    },
    resolve: {
        extensions: ['.js', '.jsx', '.json']
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                loader: 'babel-loader',
                query: {
                    cacheDirectory: true,
                    presets: ['es2015', 'react'],
                    plugins: ["transform-class-properties"]
                }
            },
            {
                test: /\.scss$/,
                  use: [{
                    loader: "style-loader"
                  }, {
                    loader: "css-loader" 
                  }, {
                    loader: "sass-loader"
                  }]
            },
            {
                test: /\.css$/,
                use: [
                    'style-loader',
                    'css-loader'
                ]
            },
            {
                test: /\.(png|svg|jpg|gif)$/,
                use: [
                    'file-loader'
                ]
            },
            {
                test: /\.(woff|woff2|eot|ttf|otf)$/,
                use: [
                    'file-loader'
                ]
            }
        ]
    }

};