webpack.config.js

const path = require("path");

module.exports = {
  entry: ["./index.js"],
  output: {
    path: path.resolve(__dirname, "dist"),
    filename: "./server.js",
  },
  externals: [
    function(context, request, callback) {
      if (request.indexOf("apollo-engine-binary") > -1) {
        return callback(null, "commonjs " + request);
      }
      callback();
    },
  ],
  target: "node",
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader",
        },
      },
    ],
  },
};