code: function setChecklist(Class, item) {
    var value = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : true;
    var checklist = getChecklist(Class);
  
    if (checklist) {
      // $FlowFixMe
      checklist[item] = value;
    }
  }
docs: Obtains the checklist from the supplied GQLBase extended class. If the
  class has a checklist, its checklist item is set to true or the boolean
  value specified.
  
  @param {Function} Class a reference to the GQLBase class to set
  @param {Symbol} item one of CHECK_SCHEMA, CHECK_RESOLVERS, or
  CHECK_API_DOCS
  @param {Boolean} value the value for the checklist item to set