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As promised, here's the typescript port, a few months late!
Up to you if you want to accept the patch - IMO adding types is a way to bring errors to light and to synchronize across big codebases, but this code is very clean and there's not as much to gain. But, it does offer types to downstream users for free. Other than that, it turned up a couple of very minor bugs (functions called with an extra argument) and clarified the relationship between
{ x, y, w, h }objects representing grid positions and the same-shaped objects representing pixel positions.