--- title: "Live Dev Session: FlashList v2, Vercel AI SDK, React Compiler" description: "This week's livestream highlighted two major releases reshaping the React and React Native landscape: FlashList v2 and Vercel AI SDK 5. " url: https://www.callstack.com/events/live-dev-session-week-32 updated: 2026-10-24T08:39:20.544Z --- # Live Dev Session: FlashList v2, Vercel AI SDK, React Compiler This week's livestream highlighted two major releases reshaping the React and React Native landscape: FlashList v2 and Vercel AI SDK 5. _Livestream · 8/7/2025, 5PM [CEST] · Online · Recording: 01:54:03 · Category: Community_ Organizer: Callstack Speakers: Łukasz Chludziński (Engineering Manager @ Callstack), Kewin Wereszczyński (Software Engineer @ Callstack) [Watch the recording](https://www.youtube.com/watch?v=2jbaqvmqYxA) This week's livestream highlighted two major releases reshaping the React and React Native landscape: FlashList v2 and Vercel AI SDK 5. Alongside them, we covered key updates across the ecosystem, from compiler enhancements to isolated runtimes and bundler breakthroughs. ## FlashList v2: A major upgrade for high-performance lists in React Native FlashList has long been one of the most efficient list libraries available for React Native, but it wasn't without trade-offs. Developers had to estimate item sizes (`estimatedItemSize` or `overrideItemLayout`), deal with native layout patches, and work around limitations with scroll accuracy and horizontal resizing. [FlashList v2](https://shopify.engineering/flashlist-v2) removes those pain points while keeping its core speed and efficiency. What's improved: - No more estimated sizes or manual layout overrides - Native layout correction modules removed, which means cleaner architecture - Scroll precision is dramatically more accurate - Horizontal lists now support dynamic item heights It's a leaner, more predictable experience for devs, and a smoother one for users. ## Vercel AI SDK 5: A stronger foundation for frontend-led AI development Vercel continues to evolve its AI tooling with a [powerful v5 release](https://vercel.com/blog/ai-sdk-5). This version strengthens the full-stack AI development experience with better abstraction, type safety, and now speech capabilities. Key features in v5: - Speech generation & transcription (experimental) - Agentic loop control: New APIs like `stopWhen` and `prepareStep` enable more controlled, multi-step workflows - Rebuilt `useChat` hook: Clean separation between model and UI messages, typed message streams, and more structure for streaming apps AI SDK 5 continues to evolve rapidly, offering increasingly robust tools for building structured, type-safe AI features; especially in TypeScript-heavy environments. ## Other React & React Native ecosystem updates ### Vercel AI SDK workshop at React Universe Conf 2025 Matt Pocock is leading a [full-day workshop](https://www.reactuniverseconf.com/workshops-2025) on the new AI SDK v5 at React Universe (Day 0). It's hands-on, and designed for devs building production-grade AI experiences. > > So [@mattpocockuk](https://twitter.com/mattpocockuk?ref%5Fsrc=twsrc%5Etfw) just dropped a behind-the-scenes look at his AI workshop prep, and let’s just say it’s packed 😮 From AI agents to memory, observability, and keeping your app from destroying the file system, this is production AI with TypeScript. > > > > Get a combo ticket now to… [pic.twitter.com/8YcIYL1111](https://t.co/8YcIYL1111) > > > > — React Universe Conf | Sept 2-4, 2025 (@reactuniverse\_) [August 5, 2025](https://twitter.com/reactuniverse%5F/status/1952671973076525562?ref%5Fsrc=twsrc%5Etfw) [Post on X](https://twitter.com/reactuniverse_/status/1952671973076525562) ### React Compiler nears stability The React Compiler continues its march [toward stable release](https://react.dev/learn/react-compiler). Recent updates to its documentation introduce new compiler directives like `use memo` and `use no memo`, giving developers fine-grained control over memoization and reactivity. It also now supports incremental adoption, letting teams apply compiler features selectively instead of all at once. ### Next.js 15.4: Turbopack powers production With `next build --turbopack` now passing all 8,298 integration tests for production builds (and powering vercel.com itself), Turbopack is no longer just for development, it's getting production-ready. This [release](https://nextjs.org/blog/next-15-4) marks a major milestone in replacing Webpack across the Next.js ecosystem. ### React Native Sandbox (Callstack Incubator) Callstack's [new library](https://github.com/callstackincubator/react-native-sandbox) enables securely isolated React Native runtimes inside a single app. Think plugin ecosystems, multi-tenant architecture, or AI agents, each running independently, with two-way messaging and crash containment. ## A decade of JavaScript runtimes From the server to the edge, and from mobile to microcontrollers,[ this retrospective](https://buttondown.com/whatever_jamie/archive/the-many-many-many-javascript-runtimes-of-the-last-decade/) covers how JS runtimes like Deno, Bun, Hermes, XS, and V8 expanded JavaScript into every corner of modern computing. Catch the full replay for live demos, in-depth commentary, and dev-first takes on where React and AI development are headed next.