React useUpdateEffect Hook: Skip the First Render (2026) useEffect has no opinion about why it's running. Mount, update, doesn't matter — the callback fires either way. Which is how a "settings saved ✓" toast greets users the moment the page loads, an autosave POSTs a form nobody has touched ye...
Source: [Dev.to](https://dev.to/childrentime/react-useupdateeffect-hook-skip-the-first-render-2026-354d)