--- title: Adapting Library Logic for React Compiler | daily.dev description: React Compiler can silently break library code that relies on object mutation. When passing mutated objects to child components, the compiler's memoization... canonical: https://daily.dev/posts/rdcghzbgr twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Adapting Library Logic for React Compiler | daily.dev og:description: React Compiler can silently break library code that relies on object mutation. When passing mutated objects to child components, the compiler's memoization... og:url: https://daily.dev/posts/rdcghzbgr og:image: https://api.daily.dev/og/posts/rDcGhzBGR.png og:image:alt: Post cover image 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. # Adapting Library Logic for React Compiler **[The React Community](https://daily.dev/sources/the_react_community)** · [@anjapcodes](https://daily.dev/anjapcodes) · 0 upvotes · 0 comments ## Summary React Compiler can silently break library code that relies on object mutation. When passing mutated objects to child components, the compiler's memoization checks referential stability rather than nested property changes, causing updates to fail. ESLint rules don't catch all mutation patterns, especially when using classes with useSyncExternalStore. Enable the panicThreshold flag to detect these issues during development. The fix involves avoiding mutation by creating new objects with useMemo instead of mutating existing ones, letting the compiler handle performance optimizations. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [I let React Compiler handle memoization: Here’s what actually broke](https://daily.dev/posts/i-let-react-compiler-handle-memoization-here-s-what-actually-broke-gzgm3acvh) · LogRocket · 58 upvotes · 5 comments - [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](https://daily.dev/posts/the-react-compiler-9txqkrlpw) · Neciu Dan · 2 upvotes · 0 comments - [Medium](https://daily.dev/posts/medium-tgs0gckgz) · Medium · 6 upvotes · 0 comments - [Your useMemo Probably Isn't Doing Anything](https://daily.dev/posts/your-usememo-probably-isn-t-doing-anything-prlcljav3) · The T-Shaped Dev · 15 upvotes · 4 comments --- Tags: [#javascript](https://daily.dev/tags/javascript), [#react](https://daily.dev/tags/react), [#performance](https://daily.dev/tags/performance), [#compiler](https://daily.dev/tags/compiler) [View this post on daily.dev](https://daily.dev/posts/rdcghzbgr) ```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":"DiscussionForumPosting","mainEntityOfPage":"https://daily.dev/posts/rdcghzbgr","headline":"Adapting Library Logic for React Compiler","text":"Shared: Adapting Library Logic for React Compiler","url":"https://daily.dev/posts/rdcghzbgr","datePublished":"2026-01-24T19:05:18.168Z","dateModified":"2026-01-24T19:05:54.650Z","author":{"@type":"Person","name":"Anja P","url":"https://daily.dev/anjapcodes","image":"https://media.daily.dev/image/upload/s--M_c0s8Ky--/f_auto/v1721658650/avatars/avatar_WVJSfJtDe63PxQFAsmXFO","description":"< Self-taught front-end developer + coding bootcamp grad, tech enthusiast + design lover + poet />","interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"EndorseAction"},"userInteractionCount":51660}},"image":"https://media.daily.dev/image/upload/s--1KxV4ohY--/f_auto/v1722860400/public/Placeholder%2007","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"sharedContent":{"@type":"WebPage","url":"https://api.daily.dev/r/MkFsg6hmv"},"isPartOf":{"@type":"WebPage","url":"https://daily.dev/squads/the_react_community","name":"The React Community"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"The React Community","item":"https://daily.dev/squads/the_react_community"},{"@type":"ListItem","position":3,"name":"Adapting Library Logic for React Compiler"}]} ```