new_contents: #!/usr/bin/env python
  
  import os
  import sys
  
  from lib.util import rm_rf
  
  
  SOURCE_ROOT = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))
  
  
  def main():
    os.chdir(SOURCE_ROOT)
    rm_rf('node_modules')
    rm_rf('out')
    rm_rf('spec/node_modules')
  
  
  if __name__ == '__main__':
    sys.exit(main())
  
subject: Add clean script