Summary & Key Takeaways ​

• TanStack Virtual now supports end-anchored virtualization.
• This feature is designed for dynamic UIs like chat, AI streams, and logs.
• It enables prepend-stable history, ensuring content doesn't jump when new items are added above.
• Append-follow functionality keeps the view pinned to the bottom for new incoming data.
• Streaming output remains pinned, providing a smooth user experience.
• This addresses common challenges in virtualizing non-standard list behaviors.

Our Commentary ​

This is a genuinely clever solution to a problem I've personally wrestled with. Virtualizing chat UIs is a nightmare. The "scroll to bottom, but also allow scrolling up for history" dynamic is deceptively hard. We've all seen chat apps that jump around. This feels like a very practical, much-needed feature. I'm curious how robust it is in practice. It could save a lot of developer headaches.