Pretty interesting! I did something similar with UI code recently (https://github.com/omphalos/earhorn https://github.com/omphalos/earhorn), although with the

Pretty interesting! I did something similar with UI code recently (https://github.com/omphalos/earhorn https://github.com/omphalos/earhorn), although with the goal of runtime variable inspection instead of performance tracing. JavaScript makes instrumentation really easy and I kind of feel like the potential of this simple technology as dev tool hasn't been fully tapped.