One library I recently "finished" was github.com/vinaypillai/ac-colors. I wanted to solve some the issues with picking colors with HSL color pickers, like how changing the hue in HSL might make colors seem brighter or darker (read more about that here). The color library I wrote was meant to address these issues, and offer a few common utilities that developers often need, like contrast ratio checking and random color generation. I think as a whole I was pretty successful, but there are still more features I want to add, like additional support for the LUV and LCHuv color spaces.
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