feat: add variant utility, fixes #16

[johanneslumpe]

No description provided.

[codecov-io]

Codecov Report

Merging #17 into master will decrease coverage by 0.08%.
The diff coverage is 97.5%.

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
- Coverage   99.91%   99.83%   -0.09%     
==========================================
  Files         281      284       +3     
  Lines        1152     1177      +25     
  Branches      292      298       +6     
==========================================
+ Hits         1151     1175      +24     
- Misses          1        2       +1

Impacted Files	Coverage Δ
src/index.ts	0% <0%> (ø)	⬆️
src/style.ts	100% <100%> (ø)	⬆️
src/variant.ts	100% <100%> (ø)
src/constants.ts	100% <100%> (ø)
src/createBreakpointStyles.ts	100% <100%> (ø)

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