Uploaded December 2025 | Updated September 2026, 5 hours ago
Lynx.js introduces a dual-threaded approach that separates UI responsibilities from background work. This model opens the door for smoother interactions, predictable performance, and a clearer mental model for how logic flows through an application. In this second session, Łukasz Chludziński and Kewin Wereszczyński build on the foundation from part one and show how this structure works in practice.
The session revisits the two-thread design used in Lynx.js: how the main thread and background thread communicate, what developers gain from this division, and how it differs from the traditional React Native execution model, while expanding on areas that sparked the most questions in part one.
From there, Łukasz and Kewin explore the APIs that let developers move work between threads, with added examples and guidance shaped by feedback from the first session. They highlight how to decide which operations belong where and how the runtime manages thread transitions in real applications.
They also return to the live coding portion, this time diving deeper into the dual-threaded model inside a production‑style setup. The comparison to React Native remains, but now with clearer contrasts informed by part-one takeaways, making it easier to see where Lynx.js aligns with familiar patterns and where it opens new possibilities for structuring logic.
See you at other Callstack live streams and webinars ✨ clstk.com/48a2QvI
Follow Callstack on X 🐦 https://x.com/callstackio
Lynx.js introduces a dual-threaded approach that separates UI responsibilities from background work. This model opens the door for smoother interactions, predictable performance, and a clearer mental model for how logic flows through an application. In this second session, Łukasz Chludziński and Kewin Wereszczyński build on the foundation from part one and show how this structure works in practice.
The session revisits the two-thread design used in Lynx.js: how the main thread and background thread communicate, what developers gain from this division, and how it differs from the traditional React Native execution model, while expanding on areas that sparked the most questions in part one.
From there, Łukasz and Kewin explore the APIs that let developers move work between threads, with added examples and guidance shaped by feedback from the first session. They highlight how to decide which operations belong where and how the runtime manages thread transitions in real applications.
They also return to the live coding portion, this time diving deeper into the dual-threaded model inside a production‑style setup. The comparison to React Native remains, but now with clearer contrasts informed by part-one takeaways, making it easier to see where Lynx.js aligns with familiar patterns and where it opens new possibilities for structuring logic.
See you at other Callstack live streams and webinars ✨ clstk.com/48a2QvI
Follow Callstack on X 🐦 https://x.com/callstackio
