class Sass::Plugin::StalenessChecker

def compute_dependencies(uri, importer)
  tree(uri, importer).grep(Tree::ImportNode) do |n|
    next if n.css_import?
    file = n.imported_file
    key = [file.options[:filename], file.options[:importer]]
    @parse_trees[key] = file.to_tree
    key
  end.compact
end