This package exports a few of the CSS variables that we use in Facebook projects. This is not the full list we have internally but focused on making available the minimum set needed by our open source projects.
Client-side support for CSS custom properties (aka "CSS variables") in legacy and modern browsers
Micro-library to split a DOM element's words & chars into elements populated with CSSvars.
PostCSS plugin to insert variables from a data source based on discovered usage