ascii-progress

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I wanted to simulate showing the progress of downloading hundreds of files but throttled to a small number of simultaneous downloads, so I created a simple example: https://gist.github.com/erhhung/3b8bdcbac3004907acf28de40a1cf21a

It seems that new ProgressBar instances are continuously being pushed onto the global instances[] array but never removed. I haven't looked into the code in detail to locate resource leaks, though the heap usage seems to be fairly stable.

I do see a couple of .forEach() loops on the instances[] array, so it will unnecessarily check more and more completed bars over time.