Javascript Iterator.Next不是进行socket.end()调用后的函数

当我对一条消息执行socket.send()时，我收到以下错误:Received message: {"type":"error","id":15,"payload":{"name":"TypeError","message":"iterator.next is not a function"}}

不确定显示此问题的原因以及如何修复它.此代码有错误:

socket.send(JSON.stringify(message))

以下是完整的代码:

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));
    });