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: vcs.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/tool/lib
    
    the code of the file until where you have to start completion: # vcs
require 'fileutils'
require 'optparse'

# This library is used by several other tools/ scripts to detect the current
# VCS in use (e.g. SVN, Git) or to interact with that VCS.

ENV.delete('PWD')

class VCS
  DEBUG_OUT = STDERR.dup
e
    
    def export_changelog(url = '.', from = nil, to = nil, _path = nil, path: _path)
      range = [to || 'HEAD', (from ? from+1 : branch_beginning(url))].compact.join(':')
      IO.popen({'TZ' => 'JST-9', 'LANG' => 'C', 'LC_ALL' => 'C'},
               %W"#{COMMAND} log -r#{range} #{url}") do |r|
        IO.copy_stream(r, path)
      end
    end