调用socket.send()后出现iterator.next is not a function错误求助

执行socket.send()发送消息时收到错误：

Received message: {"type":"error","id":15,"payload":{"name":"TypeError","message":"iterator.next is not a function"}}

触发错误的代码：

socket.send(JSON.stringify(message))

完整代码如下：

export default function () {
  const url = "wss://test.com/graphql";
  const query = `test ($scope: String = "DEFAULT", $test: Boolean = false) {
    update(scope: $scope: $test) {
      id
      status
        __typename
      }
      __typename
    }
  }
  `;
  const variables = {
    scope: "DEFAULT",
    topic: [
      "football.*.6ec99981-9ffe-4722",
    ],
  };
  const params = {
    headers: {
      Authorization: "testauth",
      "Sec-WebSocket-Protocol": "graphql-ws",
      Pragma: "no-cache",
    },
  };

  const message = {
    id: 15,
    payload: { query, variables },
  };

  const response = ws.connect(url, params, function (socket) {
    socket.on("open", function open() {
      console.log("WebSocket connection established.");

      // Send the GraphQL message
      socket.send(JSON.stringify(message));
    });
}

1. GraphQL查询语法错误：查询中的update(scope: $scope: $test)用冒号分隔参数，正确格式应为逗号，无效语法导致服务端解析器处理时抛出迭代器相关错误。
2. 消息不符合graphql-ws协议规范：graphql-ws要求消息必须包含type字段（比如start用于启动订阅），当前消息缺少该字段，服务端无法识别消息类型。
3. 变量不匹配：查询定义了$test变量，但variables对象中没有对应的test属性，参数缺失引发解析异常。

1. 修正查询语法：将参数分隔的冒号改为逗号，确保参数名与变量名对应：

   test ($scope: String = "DEFAULT", $test: Boolean = false) {
     update(scope: $scope, test: $test) {
       id
       status
       __typename
     }
     __typename
   }
   

2. 完善消息格式：添加符合graphql-ws协议的type字段：

   const message = {
     id: 15,
     type: "start",
     payload: { query, variables },
   };
   

3. 补全变量：在variables中添加test字段匹配查询定义：

   const variables = {
     scope: "DEFAULT",
     test: false,
     topic: [
       "football.*.6ec99981-9ffe-4722",
     ],
   };
   

export default function () {
  const url = "wss://test.com/graphql";
  const query = `test ($scope: String = "DEFAULT", $test: Boolean = false) {
    update(scope: $scope, test: $test) {
      id
      status
      __typename
    }
    __typename
  }`;
  const variables = {
    scope: "DEFAULT",
    test: false,
    topic: [
      "football.*.6ec99981-9ffe-4722",
    ],
  };
  const params = {
    headers: {
      Authorization: "testauth",
      "Sec-WebSocket-Protocol": "graphql-ws",
      Pragma: "no-cache",
    },
  };

  const message = {
    id: 15,
    type: "start",
    payload: { query, variables },
  };

  const response = ws.connect(url, params, function (socket) {
    socket.on("open", function open() {
      console.log("WebSocket connection established.");
      socket.send(JSON.stringify(message));
    });
  });
}

内容的提问来源于stack exchange，提问作者BruceyBandit