Instrumentation details: branches and event handlers

Can you stress-test a React UI completely hands-free? In this episode, Oskar Wickström and I are joined by Jonathan Chan to discuss the origins of Fuzzmap.

From a janitor’s closet in Figma—where end-to-end tests once lived on a "spicy pillow" MacBook—Jonathan shares how he applied coverage-guided fuzzing (inspired by AFL) to the world of web front-ends. We dive into the gnarly hacks required to instrument React, the challenges of visualizing complex state machines, and the future of "full-stack" fuzzing in the age of LLMs and team agents.