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Everything that can be written in JS will be written in JS
"Node-sass is a library that provides binding for Node.js to LibSass, the C version of the popular stylesheet preprocessor, Sass."
post-css follow the next css proposals while scss is not
post-css has an extensible list of plugins and optimizers
bootstrap 4 use sass. we stick with bootstrap
postcss has backward compatibility with both sass and less. bootstrap 5 might be written in postcss