How to use the just-scripts.webpackMerge function in just-scripts

export const defaultConfig = (digestConfig: DigestConfig): webpack.Configuration[] => {
  // TODO: optimize configs to share common instances and remove usage of just (use webpack-merge directly)
  const bundle = webpackMerge(
    webpackConfig,
    htmlOverlay({
      // TODO: is require.resolve really needed here? path.join / __dirname instead?
      template: require.resolve('../assets/index.html'),
    }),
    {
      // TODO: should entry really be pointing to lib output rather than ts?
      // TODO: reduce to entry: string?
      entry: {
        digest: require.resolve('../lib/bundle/index.digest.js'),
      },
      mode: 'production',
      output: {
        filename: '[name].js',
      },
      resolve: {

},
      optimization: {
        minimize: false,
      },
      plugins: [
        // This plugin was added to ignore warnings wherever types are imported.
        new IgnoreNotFoundExportWebpackPlugin({ include: [/\.tsx?$/] }),
      ],
    },
  )

  // This config creates a bundle that can be imported directly by the perf-test script to see all available stories.
  // Currently this is bundling all stories and their dependencies when all the script really needs is the story information.
  // The bundle size may be optimized later somehow, whether by backfilling require.context or somehow using a
  // webpack plugin to extract story information during bundling.
  const stories = webpackMerge(webpackConfig, {
    target: 'node',
    entry: {
      // TODO: If users are passing in require.context args, the entry here should probably
      // be something that just requires.context on those args and returns just story
      // information.
      stories: require.resolve('../lib/bundle/stories.js'),
    },
    mode: 'production',
    output: {
      filename: '[name].js',
      library: 'example',
      libraryTarget: 'umd',
      umdNamedDefine: true,
    },
    resolve: {
      alias: {

const { webpackMerge, htmlOverlay, webpackServeConfig } = require('just-scripts');
module.exports = webpackMerge(webpackServeConfig, htmlOverlay);