http://expo.io/

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React Compiler will apply to all React apps including both those that use react-dom and react-native. It will automatically insert memoization where possible for modest performance improvements that are already possible to achieve today with e.g. useMemo. So in that sense it will make React better but it’s not magically going to make an unsuccessful app a successful one for instance.

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Wtf?

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One ever present debate in the React community had been whether you should `useMemo`/`useCallback` all non-primitive props or not. I've often taken the position that you should in real world teams because it's too much work to determine exactly when to otherwise , whereas others argue that it's too much runtime overhead (and noise) and not worth it. u/acemarke has a good summary of the arguments . All that to say, I was curious if this compiler is essentially the React team conceding that you _should_ memoize everything. The answer is pretty interesting - the compiler actually memoizes things in a more efficient way than `useMemo` can . So it's almost the best of all worlds: improved rendering performance from memoization, cheaper memoization cost, and none of the noise of `useMemo`s sprinkled everywhere. I think we'll have to wait a bit longer to see if this works out in practice, and I'm not crazy about having to add another layer of transpilation, but if it works well this will be a pretty big win for React projects in general I think. More on reddit.com