old_contents: from django.conf import settings
  from mediasync import JS_MIMETYPES
  import os
  from subprocess import Popen, PIPE
  
  def _yui_path(settings):
      if not hasattr(settings, 'MEDIASYNC'):
          return None
      path = settings.MEDIASYNC.get('YUI_COMPRESSOR_PATH', None)
      if path:
          path = os.path.realpath(os.path.expanduser(path))
      return path
  
  def css_minifier(filedata, content_type, remote_path, is_active):
      is_css = (content_type in JS_MIMETYPES or remote_path.lower().endswith('.css'))
      yui_path = _yui_path(settings)
      if is_css and yui_path and is_active:
          proc = Popen(['java', '-jar', yui_path, '--type', 'css'], stdout=PIPE,
                       stderr=PIPE, stdin=PIPE)
          stdout, stderr = proc.communicate(input=filedata)
          return str(stdout)
  
  def js_minifier(filedata, content_type, remote_path, is_active):
      is_js = (content_type in JS_MIMETYPES or remote_path.lower().endswith('.js'))
      yui_path = _yui_path(settings)
      if is_js and yui_path and is_active:
          proc = Popen(['java', '-jar', yui_path, '--type', 'js'], stdout=PIPE,
                       stderr=PIPE, stdin=PIPE)
          stdout, stderr = proc.communicate(input=filedata)
          return str(stdout)
  
new_contents: from django.conf import settings
  from mediasync import CSS_MIMETYPES, JS_MIMETYPES
  import os
  from subprocess import Popen, PIPE
  
  def _yui_path(settings):
      if not hasattr(settings, 'MEDIASYNC'):
          return None
      path = settings.MEDIASYNC.get('YUI_COMPRESSOR_PATH', None)
      if path:
          path = os.path.realpath(os.path.expanduser(path))
      return path
  
  def css_minifier(filedata, content_type, remote_path, is_active):
      is_css = (content_type in CSS_MIMETYPES or remote_path.lower().endswith('.css'))
      yui_path = _yui_path(settings)
      if is_css and yui_path and is_active:
          proc = Popen(['java', '-jar', yui_path, '--type', 'css'], stdout=PIPE,
                       stderr=PIPE, stdin=PIPE)
          stdout, stderr = proc.communicate(input=filedata)
          return str(stdout)
  
  def js_minifier(filedata, content_type, remote_path, is_active):
      is_js = (content_type in JS_MIMETYPES or remote_path.lower().endswith('.js'))
      yui_path = _yui_path(settings)
      if is_js and yui_path and is_active:
          proc = Popen(['java', '-jar', yui_path, '--type', 'js'], stdout=PIPE,
                       stderr=PIPE, stdin=PIPE)
          stdout, stderr = proc.communicate(input=filedata)
          return str(stdout)
  
subject: Replace incorrect JS_MIMETYPES with CSS_MIMETYPES