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?
return this.renderDOM(child, context, parentNamespace);
        } else {
          var children = toArray(child);
          var frame = {
            domNamespace: parentNamespace,
            children,
            childIndex: 0,
            context: context,
            footer: '',
          };
          if (__DEV__) {
            frame.debugElementStack = [];
          }
          this.stack.push(frame);
          return '';
        }
      }
    }
  }
  renderDOM(element, context, parentNamespace) {
    var tag = element.type.toLowerCase();
    let namespace = parentNamespace;
    if (parentNamespace === Namespaces.html) {
      namespace = getIntrinsicNamespace(tag);
    }
    if (__DEV__) {
      if (namespace === Namespaces.html) {
        
        
        warning(