Streamdown 2.5 is now available
By Steven Van ·
Streamdown 2.5 adds inline KaTeX, staggered streaming animations, and fixes for CSV exports and Tailwind v3 compatibility.
Vercel's Vercel has released Streamdown 2.5, an update to the React component library for rendering streaming markdown in AI applications. The release covers streaming parser fixes, new animation controls, and code block improvements.
- A new inlineKatex option (off by default) auto-completes $formula to $formula$ while streaming, so it no longer conflicts with currency symbols; block KaTeX completion is also fixed for a partial closing $.
- A single ~ between word characters, as in 20~25°C, is now escaped so it doesn't render as strikethrough, controlled by a new singleTilde option that is on by default.
- Streaming word and character animations now cascade instead of appearing all at once, with timing set by a new stagger option (40ms default); setting stagger: 0 restores the old behaviour.
- Code blocks gain a meta prop exposing the raw fence metastring to custom renderers, plus a lineNumbers prop to turn off line numbers. Long lines now scroll horizontally instead of clipping, completed blocks no longer re-render on new streamed content, and unrecognised or truncated language identifiers fall back to plain text instead of throwing an error.
- save() now prepends a UTF-8 BOM to CSV exports so Excel on Windows detects the encoding correctly, and Tailwind v4-only *:last:/*:first: syntax has been replaced with arbitrary-variant equivalents, fixing caret rendering under Tailwind CSS v3.
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