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streamdown@1.3.0

vercel/streamdownstreamdown@1.3.0Sep 16, 2025

AI Summary

This release adds several new features including a controls prop for copy/download button visibility, component memoization for better performance, custom Mermaid configuration support, and table text/html copy functionality for Excel compatibility. It also includes various bug fixes for markdown parsing issues, Shiki language handling, and UI improvements.

Key Highlights

  • Add controls prop to control copy/download button visibility
  • Memoize components to prevent child re-renders
  • Add custom Mermaid configuration support
  • Fix word-internal underscores being incorrectly treated as incomplete markdown
  • Add table text/html copy for Excel recognition

New Features

  • Add controls prop to control copy/download button visibility
  • Memoize components to prevent child re-renders
  • Add custom Mermaid configuration support
  • Add table text/html copy for Excel recognition
  • Fix <br> in markdown tables from gpt-oss being encoded
  • Fallback to plain text when unsupported language is passed to Shiki
  • Fix long link text overflows

Full Release Notes

### Minor Changes

-   73b17a4: Add controls prop to control copy/download button visibility.
-   64b5afa: feat: memoize components to prevent child re-renders
-   d2edc90: feat: add custom Mermaid configuration support

### Patch Changes

-   f34c039: fix: <br> in markdown tables from gpt-oss seem encoded or printed to output

-   11b347e: `fix: fallback to plain text when unsupported language is passed to Shiki, preventing runtime errors`

-   266fa2b: Fix word-internal underscores being incorrectly treated as incomplete markdown

    Previously, underscores used as word separators (e.g., `hello_world`, `snake_case`) were incorrectly identified as incomplete italic markdown, causing an extra underscore to be appended. This fix:

    -   Detects when underscores are between word characters and treats them as literals
    -   Preserves the streaming markdown completion for genuine incomplete italics (e.g., `_italic text`)
    -   Correctly handles trailing newlines when completing italic formatting

    Fixes the issue where `hello_world` would become `hello_world_` when `parseIncompleteMarkdown` was enabled.

-   0ebf67d: misc 1.3 fixes and cleanup

-   d29281e: Fix the background color of `TableDropDownMenu` from `bg-white` to `bg-background`

-   333df85: Update moduleResolution in tsconfig.json to bundler

-   d583b1f: import `Lexer` only for possible tree-shaking

-   20330ba: add table text/html copy so that it can be recognized as table format in applications like Excel

-   7ae9881: fix: long link text overflows (#139)