How to use the babel-preset-es2015.default function in babel-preset-es2015

function webpackBuild(filename, libraryName, version) {
  // If this build is part of a pull request, include the pull request number in
  // the version number.
  if (process.env.CIRCLE_PR_NUMBER) {
    version += '+pr.' + process.env.CIRCLE_PR_NUMBER;
  }
  const typeofPlugin = require("babel-plugin-transform-es2015-typeof-symbol")
    .default;

  // babel-plugin-transform-es2015-typeof-symbol is not idempotent, and something
  // else is already running it, so we need to exclude it from the transform.
  const preset2015 = require("babel-preset-es2015").default();
  const es2015WithoutTypeof = {
    plugins: preset2015.plugins.filter(plugin => plugin !== typeofPlugin),
  };

  const config = {
    module: {
      rules: [
        {
          //exclude: /node_modules/,
          test: /\.js$/,
          loader: "babel-loader",
          options: {
            // Some of the node_modules may have their own "babel" section in
            // their project.json (or a ".babelrc" file). We need to ignore
            // those as we're using our own Babel options.
            babelrc: false,