---
title: "Why StyleX is having a moment"
publication: "React Status"
issue: 489
published_at: "2026-09-04"
canonical_url: "https://react.statuscode.com/issues/489"
---

Plus Vitest 5.0, TanStack and Vercel team up, how Turbopack chunks, and a huge Mantine update.        

#​489 — September 4, 2026 

[Read on the Web](https://react.statuscode.com/issues/489)  

Together with [![Sentry logo\](https://res.cloudinary.com/cpress/image/upload/c_fill,g_auto,e_trim,w_350,h_100/e_make_transparent/co_white,e_outline:7/xdmchdxkka938lxfr86f.png)](https://blog.sentry.io/evaluate-session-replay-software/?utm_source=reactstatus&utm_medium=paid-community&utm_campaign=replay-fy27q3-evergreen&utm_content=newsletter-primary-blog-replay-guide-learnmore)  React Status  

[![\](https://res.cloudinary.com/cpress/image/upload/w_1280,e_sharpen:60,q_auto/chyecu202ca5onsfqt58.jpg)](https://linear.app/now/styling-linear-for-the-future-stylex)  

[Linear's `styled-components` to StyleX Migration](https://linear.app/now/styling-linear-for-the-future-stylex) — Linear moved its React apps from `styled-components` to [StyleX](https://stylexjs.com/) and the engineer who led the effort tells the tale: [the codemod](https://github.com/skovhus/styled-components-to-stylex-codemod), where agents helped (and got stuck), and the performance gains made. 

Kenneth Skovhus (Linear)  

💡 Over at _Syntax_, Scott and Wes asked [▶️ why is everyone moving to StyleX?](https://www.youtube.com/watch?v=NIG9GbVU5po) The extra rigidity isn't much fun for humans, but agents thrive on it. ([Transcript](https://syntax.fm/show/1035/why-everyone-is-moving-to-stylex/transcript).)  [![\](https://res.cloudinary.com/cpress/image/upload/c_limit,w_480,h_480,q_auto/copm/a5d0db7f.png)](https://blog.sentry.io/evaluate-session-replay-software/?utm_source=reactstatus&utm_medium=paid-community&utm_campaign=replay-fy27q3-evergreen&utm_content=newsletter-primary-blog-replay-guide-learnmore) 

[How to Evaluate Session Replay Software](https://blog.sentry.io/evaluate-session-replay-software/?utm_source=reactstatus&utm_medium=paid-community&utm_campaign=replay-fy27q3-evergreen&utm_content=newsletter-primary-blog-replay-guide-learnmore) — Use these criteria to compare session replay tools: recording methodology, privacy architecture, integration depth, overhead, AI-readability, and mobile support. These are the choices that determine whether replay helps you ship more reliable software. 

Sentry sponsor   

[How Turbopack Chunks Your JavaScript](https://nextjs.org/blog/turbopack-chunking) — An explainer of how Turbopack chunks a Next.js app's JavaScript, and the (experimental) Next.js 16.3 options for tuning the process. Useful if you're focused on getting smaller client bundles. 

Sam Poder   

**IN BRIEF:** 

- [Vitest 5.0 is out](https://vitest.dev/blog/vitest-5.html) and is ~15% faster on its React SPA benchmark, and adds a built-in [trace view](https://vitest.dev/guide/browser/trace-view) that lets you step back through a browser test after it runs. [The migration guide](https://vitest.dev/guide/migration/) covers breaking changes.
- [𝕏 TanStack and Vercel are teaming up](https://x.com/tan_stack/status/2094888852607652280) to make Vercel a 'first-class home' for [TanStack Start](https://tanstack.com/start/latest), with [a new deploy guide](https://vercel.com/kb/guide/deploy-a-tanstack-start-app-to-vercel) as the starting point.
- A draft [`@types/react` update for React 19.3](https://github.com/DefinitelyTyped/DefinitelyTyped/pull/75429) offers a preview ([in this diff](https://github.com/DefinitelyTyped/DefinitelyTyped/pull/75429/files)) of what's stabilizing, including [`browser()`](https://react.dev/reference/react-dom/browser), `ViewTransition`, and Fragment refs.
- [Margelo is joining Callstack](https://margelo.com/blog/margelo-joins-callstack) in a deal valuing the Nitro Modules and VisionCamera creators at over €20m.   

[_thank u, next_: Replacing Next.js with a Vibe-Coded 'Framework'](https://maxleiter.com/blog/thank-u-next) — An Anthropic engineer replaced Next.js on his personal site with a 'framework' Claude built in a few hours. Even if you dislike the premise, the before/after numbers, cost breakdown, downsides, and browser quirks it surfaced make it a neat writeup. 

Max Leiter   

🤖 [Agentic Coding: Bet on the Primitives](https://www.robinwieruch.de/agentic-coding-bet-on-primitives/) – Why agents able to 'hand roll' code can tip the balance from using big libraries towards simpler primitives. Recharts vs D3, for example. Robin Wieruch 

📄 [How Shopify Raised Mobile End-to-End Test Stability to 98%](https://shopify.engineering/mobile-e2e-testing) – They rebuilt their React Native E2E suite to primarily use computer vision over `testID`s. Michael Garfinkle (Shopify) 

🤖 [Testing Google's _Modern Web Guidance_ Skill Against a Real React App](https://alfy.blog/2026/07/25/modern-web-guidance.html) Ahmad Alfy  

🛠 Code, Tools & Libraries 

[![\](https://res.cloudinary.com/cpress/image/upload/w_1280,e_sharpen:60,q_auto/kxry6khewk7uzwkifsuo.jpg)](https://mantine.dev/changelog/9-6-0/)  

[Mantine 9.6: A Huge Component Library Update](https://mantine.dev/changelog/9-6-0/) — A big update for the popular component library with a new [lightbox](https://mantine.dev/x/lightbox/) component, an [`ActionBar`](https://mantine.dev/core/action-bar/) for contextual bulk actions, four new chart types ([waffle](https://mantine.dev/charts/waffle-chart/), [matrix](https://mantine.dev/charts/matrix-chart/), [gauge](https://mantine.dev/charts/gauge-chart/), and [candlestick](https://mantine.dev/charts/candlestick-chart/)), and _much_ more besides. 

The Mantine Team   

[`cn`: shadcn's Faster Drop-In Replacement for `tailwind-merge` and `clsx`](https://github.com/shadcn-ui/cn) — Precompiles Tailwind's conflict rules into lookup tables rather than working them out every time classes are merged, plus `cn build` can trim the bundle to only the rules needed. [Here's how it works](https://github.com/shadcn-ui/cn/blob/main/docs/how-it-works.md). 

shadcn and Aiden Bai   

[GPUIX: Build GPU-Rendered Native Desktop Apps with React](https://gpuix.dev/) — An interesting attempt to render React components through Zed's (yes, the [Rust-powered code editor](https://zed.dev/)!) GPUI framework, to create native desktop apps in a single binary with no Electron/webview needed. 

Tommy D. Rossi   

[![\](https://res.cloudinary.com/cpress/image/upload/w_1280,e_sharpen:60,q_auto/vgrpnii6qehg4oqqlwy2.jpg)](https://react-aria.adobe.com/releases/v1-21-0)  

- [React Aria 1.21.0](https://react-aria.adobe.com/releases/v1-21-0) – Adobe's popular component suite adds a new `NavigationTree` component _(above)_ and `Menu` gets a big upgrade too.
- [React Countdown Clock 3.0](https://github.com/pughpugh/react-countdown-clock/releases/tag/v3.0.0) – Canvas-based countdown component now rewritten for React 18 and 19 and using `requestAnimationFrame` for smoother rendering. [Live demo](https://pughpugh.github.io/react-countdown-clock/).
- [Uppy 6.0](https://uppy.io/blog/uppy-6.0/) – Popular, powerful modular file uploader, with [React components](https://uppy.io/docs/react/) and [React Router](https://uppy.io/docs/reactrouter/) and [Next.js](https://uppy.io/docs/nextjs/) integrations.
- [Storybook 10.6](https://github.com/storybookjs/storybook/releases/tag/v10.6.0) – The component workshop adds CLI bindings for agents to drive Storybook's tools and skills.
- [React Native WebGPU 0.9](https://github.com/wcandillon/react-native-webgpu) – WebGPU implementation for React Native, now with a [hosted Expo template](https://github.com/wcandillon/react-native-webgpu/tree/main/apps/expo-webgpu) to get started.      

📰 Classifieds   

Know React? You already know how to ship a mobile app. [Expo handles cloud builds, app store submission, and OTA updates](https://try.expo.dev/4iBI3ql). No Xcode required. 

--- 

⚡[Zuplo](https://zuplo.link/iRC6nqO) puts every API, AI, and MCP request behind one gateway. Route traffic, guard your MCP servers, and cap your AI costs. [Try it free](https://zuplo.link/iRC6nqO).     

📢 Elsewhere in the ecosystem 

[![\](https://res.cloudinary.com/cpress/image/upload/w_1280,e_sharpen:60,q_auto/qhg5uwb2bt4l51pjidwq.jpg)](https://zod.dev/blog/zod-4-5)  

- [Zod 4.5 is here](https://zod.dev/blog/zod-4-5) with `z.compile()` for compiling schemas ahead of time, schemas that use 9x less memory, and a fast path for checking validity without a full parse. With how much React form and API code leans on Zod, it's worth investigating.
- ⚠️ With supply chain worms hitting React-related packages recently, [Drydock](https://drydock.org/) may be useful for package authors: it diffs the tarball you're going to publish against the last published version, so you can spot nasties that slipped in.
- Amid the excitement of [the Bun 1.4 release](https://bun.com/blog/bun-v1.4), you may have missed `build` and `Bun.build` now [have a built-in React compiler](https://bun.com/blog/bun-v1.4#built-in-react-compiler) and [`Bun.markdown.react()`](https://bun.com/blog/bun-v1.4#bun-markdown) offers a native way to convert Markdown into React elements.
- [Native HTML and CSS Features That Replaced JavaScript](https://ronaldsvilcins.com/2026/08/30/native-html-and-css-features-that-replaced-javascript/) rounds up the accordions, dialogs, popovers and effects you may no longer need a component/dependency for.         

Curated by Peter Cooper and Terence C. Gannon. 

A **[Cooperpress](https://cooperpress.com/)** publication. 

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