webpack.config.js

var path = require("path");

function resolve(filePath) {
  return path.join(__dirname, filePath)
}

var babelOptions = {
  presets: [
    ["@babel/preset-env", {
      "modules": false
    }]
  ],
  plugins: ["@babel/plugin-transform-runtime"]
}

module.exports = function(env, argv) {
  var isProduction = argv.mode == "production"
  console.log("Bundling for " + (isProduction ? "production" : "development") + "...");

  var ionideExperimental = (env && env.ionideExperimental);
  var outputPath = ionideExperimental ? "release-exp" : "release";
  console.log("Output path: " + outputPath);

  return {
  target: 'node',
  mode: isProduction ? "production" : "development",
  devtool: "source-map",
  entry: './out/fsharp.js',
  output: {
    filename: 'fsharp.js',
    path: resolve('./' + outputPath),
    //library: 'IONIDEFSHARP',
    libraryTarget: 'commonjs2'
  },
  resolve: {
    modules: [resolve("./node_modules/")]
  },
  //externals: [nodeExternals()],
  externals: {
    // Who came first the host or the plugin ?
    "vscode": "commonjs vscode",

    // Optional dependencies of ws
    "utf-8-validate": "commonjs utf-8-validate",
    "bufferutil": "commonjs bufferutil"
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: babelOptions
        },
      }
    ]
  }
};
}