webpack.config.js

const webpack = require('webpack')
const path = require('path')

let NODE_ENV = 'production'
if (process.env.NODE_ENV) {
    NODE_ENV = process.env.NODE_ENV.replace(/^\s+|\s+$/g, "")
}

module.exports = {
    entry: {
        index: './index.js',
        app: './ui/app/app.js'
    },
    output: {
        path: path.resolve(__dirname, 'build'),
		filename: '[name].js'
    },
    watch: NODE_ENV == 'development',
    module: {
        rules: [{
                test: /\.js$/,
                exclude: [/node_modules/],
                loader: 'babel-loader',
                query: {
                    presets: ['react', 'es2015']
                }
            },
            {
                test: /\.scss$/,
                use: ["style-loader", "css-loader", "sass-loader"]
            }
        ]
    },
    resolve: {
        extensions: ['.js', '.json']
    },
	optimization: {
		minimize: true
	},
    mode: NODE_ENV,
    plugins: [
        new webpack.EnvironmentPlugin('NODE_ENV')
    ]
};