You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: tmux_helper.rb
    path of file: ./repos/runbook/lib/runbook/helpers
    
    the code of the file until where you have to start completion: module Runbook::Helpers
  modu
    
    def _remove_stale_layouts
      session_panes = _session_panes
      session_layout_files = _session_layout_files
      session_layout_files.each do |file|
        File.delete(file) unless session_panes.any? { |pane| /_#{pane}_/ =~ file }
      end
    end