[allover]

Several CSS-in-JS libs support all of CSS, and allow you to write actual CSS and not camelCase styles.

styled-components [1] is prob the most popular example.

Your complaint they are evaluating JS just to set styles is valid, tho some libs, like emotion [2] support static CSS extraction.

[1] https://www.styled-components.com/docs/api#supported-css [2] https://github.com/emotion-js/emotion