Function waitForUpgrade

packages/socket.io/client-dist/socket.io.js:2076–2080

()

        close();
      };
      var waitForUpgrade = function waitForUpgrade() {
        // wait for upgrade to finish since we can't send packets while pausing a transport
        _this6.once("upgrade", cleanupAndClose);
        _this6.once("upgradeError", cleanupAndClose);
      };
      if ("opening" === this.readyState || "open" === this.readyState) {
        this.readyState = "closing";
        if (this.writeBuffer.length) {