Thanks for clarifying this. In some ambiguous contexts, lightweight might imply having less features / functionality (than the competition), which is not the case here. Anime is a fully-grown library with most of the features that you would need when working with animation in JS. And, yes, it has a really small (file)size - and this makes one love it even more! :)
Indeed, it is very functional and has many great features out of the box! So I totally agree with you that Anime.js is a mature tool for creating complex animations. And, yes, 'lightweight' - is just about its size.
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