--- title: I let React Compiler handle memoization: Here’s what... description: A hands-on account of migrating a production Next.js app to React Compiler v1.0, documenting real breakages encountered along the way. The two main failure... canonical: https://daily.dev/posts/i-let-react-compiler-handle-memoization-here-s-what-actually-broke-gzgm3acvh twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: I let React Compiler handle memoization: Here’s what actually broke | daily.dev og:description: A hands-on account of migrating a production Next.js app to React Compiler v1.0, documenting real breakages encountered along the way. The two main failure... og:url: https://daily.dev/posts/i-let-react-compiler-handle-memoization-here-s-what-actually-broke-gzgm3acvh og:image: https://api.daily.dev/og/posts/gZgm3acvh.png og:image:alt: I let React Compiler handle memoization: Here’s what actually broke og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # I let React Compiler handle memoization: Here’s what actually broke **[LogRocket](https://daily.dev/sources/logrocket)** · 11 min read · 58 upvotes · 5 comments ## Summary A hands-on account of migrating a production Next.js app to React Compiler v1.0, documenting real breakages encountered along the way. The two main failure modes were: React Hook Form's watch() function freezing live previews due to interior mutability incompatibility (fixed with a 'use no memo' wrapper), and stale data in Chart.js click handlers after removing useCallback (which had been masking a timing issue). The post clarifies that the React DevTools Memo badge signals the compiler processed a component, not that optimization succeeded. It also provides guidance on when to keep useMemo/useCallback versus deleting them, and recommends a step-by-step migration order: install and fix lint rules first, then enable the compiler, then audit incompatible libraries. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Community discussion Top comments from developers on daily.dev. **@yaireo** · 7 upvotes > I did this on a complex B2B product with hundreds of components and it went well no problems. No `NextJS` (I despise this monstrous thing) **@confidentcoding** · 4 upvotes > Hooray, a non-AI coding article! That was genuinely helpful. > >  **@pdfopsdev** · 4 upvotes > The chart handler you couldn't delete is the textbook useEffectEvent case: it gives a stable function identity (Chart.js registers once) that still reads the latest data without being a dep. Putting useCallback back works, but the handler still changes whenever onPointClick does and re-registers the effect — useEffectEvent drops it from the deps entirely and keeps one handler for the chart's lifetime. It's the 'stable reference + fresh values' primitive the useCallback was only approximating. ## Similar posts on daily.dev - [React 20: New Compiler and useMemo Changes](https://daily.dev/posts/react-20-new-compiler-and-usememo-changes-7ghtygc1e) · SitePoint · 4 upvotes · 0 comments - [The React Compiler Just Made Your Memoization Knowledge Obsolete. Here’s What to Learn Instead.](https://daily.dev/posts/the-react-compiler-just-made-your-memoization-knowledge-obsolete-here-s-what-to-learn-instead--sfdrxwm6z) · Medium · 65 upvotes · 6 comments - [React Compiler Explained: Do You Still Need useMemo, useCallback, and React.memo?](https://daily.dev/posts/react-compiler-explained-do-you-still-need-usememo-usecallback-and-react-memo--4dhnwgumi) · Syncfusion · 30 upvotes · 1 comments - [React 19 Compiler: What Senior Developers Need to Know](https://daily.dev/posts/react-19-compiler-what-senior-developers-need-to-know-smq3uiudw) · SitePoint · 87 upvotes · 6 comments --- Tags: [#react](https://daily.dev/tags/react), [#nextjs](https://daily.dev/tags/nextjs) [View this post on daily.dev](https://daily.dev/posts/i-let-react-compiler-handle-memoization-here-s-what-actually-broke-gzgm3acvh) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"I let React Compiler handle memoization: Here’s what actually broke","url":"https://daily.dev/posts/i-let-react-compiler-handle-memoization-here-s-what-actually-broke-gzgm3acvh","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/i-let-react-compiler-handle-memoization-here-s-what-actually-broke-gzgm3acvh"},"datePublished":"2026-07-07T10:58:19.116Z","dateModified":"2026-07-08T06:17:32.477Z","description":"A hands-on account of migrating a production Next.js app to React Compiler v1.0, documenting real breakages encountered along the way. 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No NextJS (I despise this monstrous thing)","datePublished":"2026-07-07T11:54:45.769Z","url":"https://daily.dev/posts/gZgm3acvh#c-3LY7tpuoQ","author":{"@type":"Person","name":"Yair Even Or","url":"https://daily.dev/yaireo","image":"https://avatars.githubusercontent.com/u/845031?v=4"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":7}},{"@type":"Comment","text":"Hooray, a non-AI coding article! That was genuinely helpful.","datePublished":"2026-07-08T14:26:47.013Z","dateModified":"2026-07-08T14:28:56.680Z","url":"https://daily.dev/posts/gZgm3acvh#c-zjL44GeJc","author":{"@type":"Person","name":"Lars Faye | Confident Coding","url":"https://daily.dev/confidentcoding","image":"https://media.daily.dev/image/upload/s--OGZu5DEc--/f_auto/v1772569630/avatars/avatar_umWZ9aQAng34qk5aaJl2q?_a=BAMAMiiu0"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":4}},{"@type":"Comment","text":"The chart handler you couldn’t delete is the textbook useEffectEvent case: it gives a stable function identity (Chart.js registers once) that still reads the latest data without being a dep. Putting useCallback back works, but the handler still changes whenever onPointClick does and re-registers the effect — useEffectEvent drops it from the deps entirely and keeps one handler for the chart’s lifetime. It’s the ‘stable reference + fresh values’ primitive the useCallback was only approximating.","datePublished":"2026-07-07T18:11:23.230Z","url":"https://daily.dev/posts/gZgm3acvh#c-WDC8T4Scw","author":{"@type":"Person","name":"PDFops","url":"https://daily.dev/pdfopsdev","image":"https://media.daily.dev/image/upload/s---8isRBKc--/f_auto/v1782922291/avatars/avatar_orjMeK8QKaaVZwGq7ScPz?_a=BAMAMicg0"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":4}}]} ```