class Opal::Sprockets::Processor

def process_required_trees(required_trees, context)
  return if required_trees.empty?
  # This is the root dir of the logical path, we need this because
  # the compiler gives us the path relative to the file's logical path.
  dirname = File.dirname(input[:filename]).gsub(/#{Regexp.escape File.dirname(context.logical_path)}#{Opal::REGEXP_END}/, '')
  dirname = Pathname(dirname)
  required_trees.each do |original_required_tree|
    required_tree = Pathname(original_required_tree)
    unless required_tree.relative?
      raise ArgumentError, "require_tree argument must be a relative path: #{required_tree.inspect}"
    end
    required_tree = dirname.join(input[:filename], '..', required_tree)
    unless required_tree.directory?
      raise ArgumentError, "require_tree argument must be a directory: #{{source: original_required_tree, pathname: required_tree}.inspect}"
    end
    context.depend_on required_tree.to_s
    environment = context.environment
    processor = ::Sprockets::DirectiveProcessor.new
    processor.instance_variable_set('@dirname', File.dirname(input[:filename]))
    processor.instance_variable_set('@environment', environment)
    path = processor.__send__(:expand_relative_dirname, :require_tree, original_required_tree)
    absolute_paths = environment.__send__(:stat_sorted_tree_with_dependencies, path).first.map(&:first)
    absolute_paths.each do |path|
      path = Pathname(path)
      pathname = path.relative_path_from(dirname).to_s
      pathname_noext = pathname.sub(sprockets_extnames_regexp, '')
      if path.to_s == logical_path then next
      elsif ::Opal::Config.stubbed_files.include?(pathname_noext) then next
      elsif path.directory? then context.depend_on(path.to_s)
      else context.require_asset(pathname_noext)
      end
    end
  end
end