webpack.config.js

const path = require("path");
const webpack = require("webpack");

module.exports = env => {
  return {
    entry: env.production ? ["./ReactCardFlipper.js"] : ["./Test.js"],
    output: {
      filename: env.production ? "ReactCardFlipper.js" : "test_bundle.js",
      path: env.production
        ? path.resolve(__dirname, "dist")
        : path.resolve(__dirname, "tests"),
      library: "ReactCardFlipper",
      libraryTarget: "umd"
    },
    devServer: {
      contentBase: "./tests"
    },
    module: {
      rules: [
        { test: /\.js$/, exclude: /node_modules/, loader: "babel-loader" },
        {
          test: /\.css$/,
          use: [
            "style-loader",
            { loader: "css-loader", options: { importLoaders: 1 } },
            "postcss-loader"
          ]
        }
      ]
    },
    plugins: [
      env.production
        ? new webpack.DefinePlugin({
            "process.env": { NODE_ENV: JSON.stringify("production") }
          })
        : new webpack.DefinePlugin({
            "process.env": { NODE_ENV: JSON.stringify("develop") }
          }),
      new webpack.optimize.UglifyJsPlugin()
    ]
  };
};