I'm not seeing React being used, though, just TSX/JSX? All the view and state updating is being done manually, but it looks fairly well-organised. There are small optimisations like debouncing onInput with a timeout (avoiding rapid re-rendering/reacting to every character typed): https://github.com/wisercoder/eureka/blob/master/webapp/Clie...

Is this really much more complicated to implement than the equivalent implementation in React? (It's probably a bit more responsive, at least.)