lightDark helper in css-utils

[johnnyggalt]

Hi,

Maybe I'm missing or misunderstanding something, but would it make sense for the css-utils package to include a lightDark function? I went there looking for one and was surprised to find only the calc function in it. Basically I want something to replace interpolating light-dark CSS calls:

color: `light-dark(${something}, ${somethingElse})`,

versus

color: lightDark(something, somethingElse),

I can of course write my own helper, but my immediate thought was: surely vanilla-extract already provides something for this.

[askoufis]

Utils haven't been a priority recently, especially ones that are simple string replacements like light-dark.

calc is common enough, quite generic but can be used to form quite complex expressions, so it made sense to provide a utility for it early on.

light-dark on the other hand is very simple, and might make more sense implemented in userland with values scoped to known design token strings, for example.

TL;DR most utils aren't high priority and can be easily (and often to better effect) implemented in userland. They may eventually be implemented in the future.