How to use the @expo/webpack-config/env.getConfig function in @expo/webpack-config

// Support React Native aliases
  // @ts-ignore: webpack version mismatch
  config = withAlias(config);

  const projectRoot = options.projectRoot || process.cwd();

  const env: any = {
    platform: 'electron',
    projectRoot,
    mode: config.mode === 'production' ? config.mode : 'development',
    locations: getPaths(projectRoot),
  };
  if (!config.plugins) config.plugins = [];
  if (!config.resolve) config.resolve = {};

  env.config = getConfig(env);

  const [plugin] = getPluginsByName(config, 'HtmlWebpackPlugin');
  if (plugin) {
    const { options } = plugin.plugin as any;
    // Replace HTML Webpack Plugin so we can interpolate it
    // @ts-ignore: webpack version mismatch
    config.plugins.splice(plugin.index, 1, new HtmlWebpackPlugin(options));
    config.plugins.splice(
      plugin.index + 1,
      0,
      // Add variables to the `index.html`
      // @ts-ignore
      ExpoInterpolateHtmlPlugin.fromEnv(env, HtmlWebpackPlugin)
    );
  }