Being able to automate tests for memory leaks is very helpful but I would much rather incorporate the browser dev tools than not when debugging memory. Doing it only in javascript feels very janky (weak maps, attaching giant array objects to things, waiting ?? amount of time for the automated GC to run).

I was debugging memory leaks in some pretty large javascript products and while I did initially start with methods like this post, I only started to make reliable progress when I became familiar with the heap snapshot tool. Diagnosing problem is trivial (just filter the heap snapshot by a Class name and count the instances) and it is The Tool To Use to actually resolve it (tracing the chain of references in the retainers view)

In the future if I need to write automated tests to identify memory leaks I will look into automating the Dev Tools rather than fumbling with WeakMap or performance.memory.usedJSHeapSize