Manipulating the body class attribute in react app’s is not straight forward, because of it’s nested components architecture. The workaround demonstrated in this article helps out.
The Ionic dev team has changed the build processes in the beta and release candidate phases quite a bit and I had troubles to figure out solutions for including third party libs. Here is one of them.
After updating a website containing custom extensions built by the extension_builder I encountered the problem of my text fields not showing the RTE anymore.
Fetching data via ajax from your typo3 website frontend can be done with an eid script or a custom typoscript page object targeted with it’s own pagetype. The latter is explained in this post.