Svelte seems promising. I think it's a natural evolution from what I think is an over focus on FP and purity in React, to a more natural and intuitive DX without significant drawbacks.

Svelte does have an irritating wart IMO, citing their tutorial:

     Because Svelte's reactivity is triggered by assignments, using array 
     methods like push and splice won't automatically cause updates. 

So for reference types that are mutated in place you need to do something like:

     numbers.push(numbers.length + 1);
     numbers = numbers;

Or:

     numbers = [...numbers, numbers.length + 1];

This looks like a leaky abstraction to me since it forces the developer to work according to the implementation details. Don't know how easy it would be to fix this.