Add validation check for type scale accessibility #2
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Background: If you're not careful, when using fluid typography it's possible to end up violating the WCAG SC 1.4.4 accessibility rule (about zooming text).
Fortunately it's possible to do some math to ensure that the rule is not violated. More details here:
https://www.smashingmagazine.com/2023/11/addressing-accessibility-concerns-fluid-type/
I'm not a math whiz myself, but fortunately someone already implemented the validation discussed in the article, so I was able to adapt the code from this existing repo:
https://github.com/barvian/fluid-tailwind/blob/f85f1ae5a50ec1a37f99418d6d087a3a2e783e1b/packages/fluid-tailwind/src/util/expr.ts#L116
I decided to make it an error by default and also to still show it as a warning if you set
typeScale.validateAccessibilityto false, but I could of course change the PR if different behavior is desired.