Does it support ssr?

[devnomic]

like set the store initial value on render.

quoting jotai
The primary use case for useHydrateAtoms are SSR apps like Next.js, where an initial value is e.g. fetched on the server, which can be passed to a component by props.
https://jotai.org/docs/utilities/ssr

[bokeeeey]

We hit a concrete case of this in production (TanStack Start; a theme store synced from localStorage; a code-split chunk hydrating late) and traced it to useSelector passing the live client snapshot as getServerSnapshot — so any store write that lands before (late) hydration renders differently from the server HTML, and React reports a hydration mismatch.

I've written up a repro (verified on React 18 and 19), the ecosystem precedent (react-redux serverState, zustand getInitialState, nanostores ssr), and a minimal opt-in proposal here: #344

TL;DR: useSelector(store, selector, { getServerSnapshot }), defaulting to current behavior.