webpack.library.config.js

const path = require("path");

module.exports = {
  module: {
    rules: [
      {
        test: /\.css$/,
        use: ["style-loader", "css-loader"]
      },
      {
        test: /\.js$/,
        exclude: /(node_modules)/,
        use: {
          loader: "babel-loader"
        }
      },
      {
        test: /\.(wsz|mp3)$/,
        use: [
          {
            loader: "file-loader",
            options: {
              emitFile: true,
              name: "[path][name]-[hash].[ext]"
            }
          }
        ]
      }
    ],
    noParse: [/jszip\.js$/]
  },
  entry: ["babel-polyfill", "./js/winamp.js"],
  output: {
    path: path.resolve(__dirname, "built"),
    filename: "winamp.bundle.js",
    library: "winamp2js",
    libraryTarget: "umd"
  }
};