@throwTypeError("underlyingSink.write should be a function");
    }
    if ("close" in underlyingSink) {
        underlyingSinkDict["close"] = underlyingSink["close"];
        if (typeof underlyingSinkDict["close"] !== "function")
            @throwTypeError("underlyingSink.close should be a function");
    }
    if ("abort" in underlyingSink) {
        underlyingSinkDict["abort"] = underlyingSink["abort"];
        if (typeof underlyingSinkDict["abort"] !== "function")
            @throwTypeError("underlyingSink.abort should be a function");
    }

    @initializeWritableStreamSlots(stream, underlyingSink);
    @setUpWritableStreamDefaultControllerFromUnderlyingSink(stream, underlyingSink, underlyingSinkDict, highWaterMark, sizeAlgorithm);

    return stream;
})