def clean(individual_files = [])
      file_list(individual_files).each do |(_, css_file, sourcemap_file)|
        if File.exist?(css_file)
          run_deleting_css css_file
          File.delete(css_file)
        end
        if sourcemap_file && File.exist?(sourcemap_file)
          run_deleting_sourcemap sourcemap_file
          File.delete(sourcemap_file)
        end
      end
      nil
    end
def clean(individual_files = [])
      file_list(individual_files).each do |(_, css_file, sourcemap_file)|
        if File.exist?(css_file)
          run_deleting_css css_file
          File.delete(css_file)
        end
        if sourcemap_file && File.exist?(sourcemap_file)
          run_deleting_sourcemap sourcemap_file
          File.delete(sourcemap_file)
        end
      end
      nil
    end
Remove all output files that would be created by calling update_stylesheets, if they exist.

 This method runs the deleting_css and deleting_sourcemap callbacks for
 the files that are deleted.

 @param individual_files [Array<(String, String[, String])>]
   A list of files to check for updates
   **in addition to those specified by the
   {file:SASS_REFERENCE.md#template_location-option `:template_location` option}.**
   The first string in each pair is the location of the Sass/SCSS file,
   the second is the location of the CSS file that it should be compiled to.
   The third string, if provided, is the location of the Sourcemap file.