webpack.config.js

let packageConfig = require('./package.json');
let env = process.env.ENV || 'dev';

let Urls = {
    dev: './dist/',
    prod: 'my/deployment/url/maybe/s3/bucket/folder/'
};

let srcServer = Urls[env];

module.exports = {
    entry: './main.js',
    output: {
        path: __dirname + '/dist',
        filename: 'bundle.js'
    },
    module: {
        loaders: [
            {
                test: /\.tag$/,
                exclude: /node_modules/,
                loader: 'string-replace-loader',
                query: {
                    search: /##srcServer##/g,
                    replace: srcServer
                }
            },
            {
                test: /\.(gif|jpg|png|mp3|aac|ogg|m4a)$/,
                loader: 'file-loader'
            },
            {
                test: /\.tag$/,
                exclude: /node_modules/,
                loader: 'riot-tag-loader',
                query: {
                    style: 'scss'
                }
            },
            {
                test: /\.css$/,
                use: ['style-loader', 'css-loader']
            },
            {
                test: /\.scss$/,
                use: ['style-loader', 'css-loader', 'sass-loader']
            },
            {
                test: /\.js$/,
                exclude: /node_modules/,
                loader: 'babel-loader',
                query: {
                    presets: packageConfig.babel.presets,
                    plugins: packageConfig.babel.plugins
                }
            }
        ],
    }
};