Method constructor

deps/undici/undici.js:14524–14537

(type, eventInitDict = {})

      }
      #eventInit;
      constructor(type, eventInitDict = {}) {
        if (type === kConstruct) {
          super(arguments[1], arguments[2]);
          webidl.util.markAsUncloneable(this);
          return;
        }
        const prefix = "MessageEvent constructor";
        webidl.argumentLengthCheck(arguments, 1, prefix);
        type = webidl.converters.DOMString(type, prefix, "type");
        eventInitDict = webidl.converters.MessageEventInit(eventInitDict, prefix, "eventInitDict");
        super(type, eventInitDict);
        this.#eventInit = eventInitDict;
        webidl.util.markAsUncloneable(this);
      }
      get data() {
        webidl.brandCheck(this, _MessageEvent);
        return this.#eventInit.data;