I am back to bug hunting. Reactive live coding is great when it works but the bugs can be devilishly difficult. The best methodology I have is plotting all the transitions on a timeseries and zooming RIGHT IN. Its a technique I keep coming back to and it has fixed quite a few subtle issues. I used to think the dependancy graph would be useful but actually a lot of the reactivity bugs occur via hidden event coupling occurring outside the programming model, for example, mouse events, url events, local storage events. They can cause different cells to trigger each other but not through the normal notification mechanisms.