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DevGitHub Blogabout 1 hour ago

GitHub Migrates Primer Design System to CSS Modules

9 min read

GitHub migrated its Primer design system from CSS-in-JS to CSS Modules by December 2024, cutting server-side render time by 55% and component initialization by 25%. The team then removed roughly 7,760 sx props across the codebase, finishing in April 2026, though styled-components still powers seven themes and their high contrast variants.

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