Method constructor

deps/undici/undici.js:14619–14627

(type, eventInitDict)

      }
      #eventInit;
      constructor(type, eventInitDict) {
        const prefix = "ErrorEvent constructor";
        webidl.argumentLengthCheck(arguments, 1, prefix);
        super(type, eventInitDict);
        webidl.util.markAsUncloneable(this);
        type = webidl.converters.DOMString(type, prefix, "type");
        eventInitDict = webidl.converters.ErrorEventInit(eventInitDict ?? {});
        this.#eventInit = eventInitDict;
      }
      get message() {
        webidl.brandCheck(this, _ErrorEvent);
        return this.#eventInit.message;