# React

Functionallity varies between projects, some do not generate correct sourcemaps for all the CSS. React projects often generate incorrect line numbers for CSS in JS.

# Next

By default, using @zeit/next-css or @zeit/styled-jsx, sourcemaps are not correctly generated.

# Gatsby

Fully working using CSS files (like 404.css).

# Styled Components

Does not support sourcemaps yet, there is currently an open pull request to add sourcemaps to styled components.