sapper/webpack/config.js

const { dest, dev, entry } = require('../lib/config.js');

module.exports = {
	dev,

	client: {
		entry: () => {
			return {
				main: [
					entry.client,
					// workaround for https://github.com/webpack-contrib/extract-text-webpack-plugin/issues/456
					'style-loader/lib/addStyles',
					'css-loader/lib/css-base'
				]
			};
		},

		output: () => {
			return {
				path: `${dest}/client`,
				filename: '[name].[hash].js',
				chunkFilename: '[name].[id].[hash].js',
				publicPath: '/client/'
			};
		}
	},

	server: {
		entry: () => {
			return {
				main: entry.server
			};
		},

		output: () => {
			return {
				path: `${dest}/server`,
				filename: '[name].[hash].js',
				chunkFilename: '[name].[id].[hash].js',
				libraryTarget: 'commonjs2'
			};
		}
	}
};