class Zeitwerk::GemLoader

def warn_on_extra_files
  expected_namespace_dir = @root_file.delete_suffix(".rb")
  ls(@root_dir) do |basename, abspath|
    next if abspath == @root_file
    next if abspath == expected_namespace_dir
    basename_without_ext = basename.delete_suffix(".rb")
    cname = inflector.camelize(basename_without_ext, abspath).to_sym
    ftype = dir?(abspath) ? "directory" : "file"
    warn(<<~EOS)
      WARNING: Zeitwerk defines the constant #{cname} after the #{ftype}
          #{abspath}
      To prevent that, please configure the loader to ignore it:
          loader.ignore("\#{__dir__}/#{basename}")
      Otherwise, there is a flag to silence this warning:
          Zeitwerk::Loader.for_gem(warn_on_extra_files: false)
    EOS
  end
end