# File lib/juicer/merger/base.rb, line 24
      def append(file)
        return file.each { |f| self << f } if file.class == Array
        return if @files.include?(file)

        if !@dependency_resolver.nil?
          path = File.expand_path(file)
          resolve_dependencies(path)
        elsif !@files.include?(file)
          @files << file
        end
      end