function createPlugin(requireClassname, paragraphMode = undefined) {
  field.queryCommandValue('+defaultTag')
      .$anyTimes()
      .$returns(paragraphMode ? TagName.P : undefined);

  plugin = new Blockquote(requireClassname);
  plugin.registerFieldObject(field);
  plugin.enable(field);
}
@suppress {missingProperties,checkTypes} suppression added to enable type
checking