In the last month, both Preact and Qwik announced support for fine-grained reactivity with signals. This is what enables SolidJS to have performance almost as fast as imperative vanilla JS. But the team is working on a new, less capable reactive primitive. It's basically going to do the job of the map RxJS operator.
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Reactivity is for code organizationSynchronization is not enoughAsynchronous reactivity is difficult to supportRxJS is a great temporary solution for any frameworkCurrent state of RxJS compatibility in frameworksConclusionSort: