You can get some Sass/LESS benefit using PostCSS with CSSNext plugin. CSSNext will give you ability to use future CSS syntax now. If you want to go further, the

You can get some Sass/LESS benefit using PostCSS with CSSNext plugin. CSSNext will give you ability to use future CSS syntax now. If you want to go further, there is even a PostCSS plugin precss that can replace Sass/LESS. I just use CSSNext + autoprefixer + cssnano.