Function makeDispatcher

github-actions/browserstack/set-browserstack-env.js:19275–19312

(fn)

        set onmessage(fn) {
          if (__privateGet(this, _events).message) {
            this.removeEventListener("message", __privateGet(this, _events).message);
          }
          if (typeof fn === "function") {
            __privateGet(this, _events).message = fn;
            this.addEventListener("message", fn);
          } else {
            __privateGet(this, _events).message = null;
          }
        }
        get onerror() {
          return __privateGet(this, _events).error;
        }
        set onerror(fn) {
          if (__privateGet(this, _events).error) {
            this.removeEventListener("error", __privateGet(this, _events).error);
          }
          if (typeof fn === "function") {
            __privateGet(this, _events).error = fn;
            this.addEventListener("error", fn);
          } else {
            __privateGet(this, _events).error = null;
          }
        }
      };
      _events = new WeakMap();
      _url = new WeakMap();
      _withCredentials = new WeakMap();
      _readyState = new WeakMap();
      _request = new WeakMap();
      _controller = new WeakMap();
      _dispatcher = new WeakMap();
      _state = new WeakMap();
      _connect = new WeakSet();
      connect_fn = function() {
        if (__privateGet(this, _readyState) === CLOSED)
          return;
        __privateSet(this, _readyState, CONNECTING);
        const fetchParams = {
          request: __privateGet(this, _request),
          dispatcher: __privateGet(this, _dispatcher)
        };