React Day Berlin

React Day Berlin 2023

Nicolas Dubien

Break the Race: Easy Race Condition Detection for React

TestJS Summit

TestJS Summit 2023

Fine-Grained Reactivity Without Any Compiler

React Day Berlin 2024

Achieving high-performance reactivity in React without compromising the developer experience has always been a key challenge. When building real-time applications designed to display hundreds of millions of rows without noticeable lag, fine-grained reactivity is essential. But when I started my journey at Pigment, neither Recoil, Jotai, nor Zustand were mature enough, and React Compiler was not yet a thing. Let's explore together how we managed to ingest, display, and update huge datasets seamlessly without sacrificing the developer or the user experience.

Race conditions are among some of the most challenging to detect and reproduce issues. As such they pose a significant challenge in development notably in UI. In this talk, we explore how to detect race conditions by leveraging fuzzing techniques. We walk you through discovering the real problem of race conditions and how they impact user experience. We provide you tools and examples demonstrating how to easily detect them in your daily work thanks to tests relying on fuzzing. After that talk, we hope your React code will be race conditions free or at least that you will have the right tools to help you.