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: watcher.rb
    path of file: ./repos/discourse/lib/stylesheet
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require "listen"

module Stylesheet
  class Watcher
    def self.watch
    
    def start
      Thread.new do
        begin
          worker_loop while true
        rescue => e
          STDERR.puts "CSS change notifier crashed \n#{e}"
          start
        end
      end