remove_dependencies = () => {
  const rm = exec("rm -rf node_modules && rm -rf bower_components");
  return rm;
}
NPM post-install middleware.
By default runs webpack.

Set SKIP_WEBPACK=true` to skip the webpack build.
Set `DELETE_DEPENDENCIES=true` to delete node_modules and bower_components.
Useful when building the client for only the `public` folder.