“订阅字段必须返回异步可迭代。收到：未定义”

Question

我有一个触发频道事件'countIncr'的变体，但是我看不到带有事件有效负载的活动的相应订阅触发。更新：我对此发布内容进行了一些更新，现在我更改标题以更代表我的位置。我收到了graphqlPlayground错误"Subscription field must return Async Iterable. Received: undefined"TGRstack复制我遇到了麻烦： https : //github.com/TGRstack/tgr-apollo-subscription-example-microservice/在没有TGRstack的情况下进行工作复制： https : //github.com/Falieson/fullstack-apollo-subscription-example前端：https： //github.com/TGRstack/tgr-apollo-subscription-example-microservice/blob/master/counter-ui/src/app/routes/Home/HomePage.tsxconst COUNTER_SUBSCRIPTION = gql`subscription onCountIncr {  count}`const Counter = () => (  <Subscription    subscription={COUNTER_SUBSCRIPTION}  >    {({ data, loading }) => {      console.log({loading, data})      return loading        ? <h1>Loading ...</h1>        : data.count          ? <h2>Counter: {data.count}</h2>          : <h1>Counter Subscription Not Available</h1>    }}  </Subscription>)BE解析器：https : //github.com/TGRstack/tgr-apollo-subscription-example-microservice/blob/master/counter-service/src/gql/Resolvers.ts是模式：https : //github.com/TGRstack/tgr-apollo-subscription-example-microservice/blob/master/counter-service/src/gql/Schema.tsBE控制器：https：//github.com/TGRstack/tgr-apollo-subscription-example-microservice/blob/master/counter-service/src/gql/Counter.tsconst count = {  resolve: data => {    console.log('CounterSub>', {data})    return data  },  subscribe: () => pubsub.asyncIterator(['countIncr'])}const CounterSubscriptions = {  count}async function countIncr(root: any, args: any, context: any) {  const count = Counter.increment()  await pubsub.publish('countIncr', count )  console.log('countIncr', '>>>', { count })  return count}