webpack.server.config.js

const nodeExternals = require('webpack-node-externals');
const path = require('path');

const srcPath = path.resolve(__dirname, 'src');
const distPath = path.resolve(__dirname, 'dist');

module.exports = {
    context: srcPath,
    entry: './server/index.js',
    output: {
        path: distPath,
        filename: 'server.js',
        publicPath: '/assets/',
    },
    target: 'node',
    node: {
        __dirname: false,
        __filename: false,
    },
    resolve: {
        modules: ['node_modules', 'src'],
        extensions: ['*', '.js', '.json'],
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                loader: 'babel-loader',
                query: {
                    presets: [
                        ['env', {
                            targets: {
                                node: 8,
                            },
                        }],
                    ],
                },
            },
        ],
    },
    externals: nodeExternals(),
};