It doesn’t have a `@flow` annotation. We should start Flow-ifying it to avoid bugs like https://github.com/facebook/react/pull/11173.

@iamdustan Wanna take it?
out += '\n';
      }
      out += innerMarkup;
    } else {
      children = toArray(props.children);
    }
    var frame = {
      domNamespace: getChildNamespace(parentNamespace, element.type),
      tag,
      children,
      childIndex: 0,
      context: context,
      footer: footer,
    };
    if (__DEV__) {
      frame.debugElementStack = [];
    }
    this.stack.push(frame);
    this.previousWasTextNode = false;
    return out;
  }
}
module.exports = ReactDOMServerRenderer;