webpack.config.js

var path = require('path');
var webpack = require('webpack');

const ExtractTextPlugin = require('extract-text-webpack-plugin');
module.exports = {
    entry: './src/index.js',
    mode: 'development',
    output: {
        path: path.resolve(__dirname, 'build'),
        filename: 'index.js',
        libraryTarget: 'commonjs2'
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                include: path.resolve(__dirname, 'src'),
                exclude: /(node_modules|bower_components)/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['@babel/preset-env']
                    }
                }
            },
            {
                test: /\.css$/,
                include: path.resolve(__dirname, 'src', 'assets', 'styles'),
                exclude: /(node_modules|bower_components)/,
                use: [
                    { loader: 'style-loader' },
                    { loader: 'css-loader' }
                ]
            }
        ]
    },
    externals: {
        'react': 'commonjs react'
    },
    plugins: [
        new ExtractTextPlugin('react-table.css')
    ]
};