dat.gui/webpack.config.js

var path = require("path");

module.exports = {
    target: 'web',

    context: path.resolve(__dirname, 'src'),

    entry: {
        main: '../index'
    },

    module: {
        loaders: [
            { test: /\.css$/, loader: "style-loader!css-loader" },
            { test: /\.png$/, loader: "url-loader?limit=100000" },
            { test: /\.jpg$/, loader: "file-loader" }
        ]
    },

    output: {
        path: path.join(__dirname, 'build'),
        filename: 'dat.gui.js',
        library: ['dat'],
        libraryTarget: 'umd'
    }
};