gengitkan/client/src/store/selectors/flags.ts

export function selectFlagsIsLoading(state: any, ...actionPrefixes: any[]) {
  const { actions } = state.flags;
  return actionPrefixes.reduce((isLoading, prefix) => {
    if (!(prefix in actions)) return isLoading; 
    return isLoading || actions[prefix].isLoading;
  }, false);
};