Method doSetHostOnMessage

valdi/src/valdi/runtime/JavaScript/JavaScriptWorker.cpp:113–115

                                           Value(makeShared<ValueFunctionWithCallable>(postMessageFunc)));
    auto closeFunc = [weakSelf](const ValueFunctionCallContext& callContext) -> Value {
        auto self = weakSelf.lock();
        if (self) {
            self->close();
        }
        return Value::undefined();
    };