ReasonReact's ReactDOM module is called ReactDOMRe. The module exposes helpers that work with familiar ReactJS idioms.
render:(React.element, Dom.element) => unitunmountComponentAtNode:Dom.element => unithydrate:(React.element, Dom.element) => unitcreatePortal:(React.element, Dom.element) => React.element
ReasonReact's equivalent ReactDOMServer exposes:
renderToString:React.element => stringrenderToStaticMarkup:React.element => string
