feat: add Tailwind CSS prefix support - #408
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When cn() output (e.g. 'tw:size-full') is passed as className to a child component that also calls cn() with the same prefix, prefixClasses() was naively prepending the prefix again, producing 'tw:tw:size-full'. Fix: skip classes that already start with the prefix+colon sentinel. Add tests for both the all-already-prefixed and mixed cases.
- Bump changeset to minor (new feature, not patch) - Rename shadowed cn import to baseCn in code-block/body.tsx - Document that user className values are also prefixed Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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awesome PR, thanks @sleitor 🙏 |
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Adds a
prefixprop to<Streamdown>that prepends a configurable prefix to all Tailwind utility classes in the rendered output.This enables seamless integration with Tailwind v4's
prefix()feature, where all utilities are namespaced (e.g.,tw:flexinstead offlex).Usage
With
prefix="tw", all rendered elements will use prefixed classes:flex items-center→tw:flex tw:items-centerdark:bg-red-500→tw:dark:bg-red-500When no prefix is specified, behavior is unchanged (zero overhead).
Implementation
prefixClasses()utility transforms class stringsPrefixContextprovides a prefix-awarecn()to all componentscnviauseCn()hooktailwind-mergeresolutionCloses #190