class Sass::Plugin::StalenessChecker

def dependencies_stale?(template_file, css_mtime)
  timestamps = @dependencies_stale[template_file] ||= {}
  timestamps.each_pair do |checked_css_mtime, is_stale|
    if checked_css_mtime <= css_mtime && !is_stale
      return false
    elsif checked_css_mtime > css_mtime && is_stale
      return true
    end
  end
  timestamps[css_mtime] = dependencies(template_file).any?(&dependency_updated?(css_mtime))
end