Version Packages

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Releases

@streamdown/code@2.0.0

Major Changes

• db6fefc: Upgrade Shiki to v4. Node.js 20 or newer is now required when using @streamdown/code.

streamdown@2.7.0

Minor Changes

• b1965bb: feat: add fallbackComponent prop for missing map entries / allowedTags

  Adds a new fallbackComponent prop to <Streamdown>. When provided, it is
  used as a fallback renderer for any HTML tag or allowed custom tag that does
  not have an explicit entry in the components map:

  <Streamdown
    allowedTags={{ mention: ["user_id"] }}
    fallbackComponent={({ node, children, ...props }) =>
      createElement(node!.tagName, props, children)
    }
  >
    {markdown}
  </Streamdown>

  fallbackComponent applies to custom tags declared via allowedTags (with no
  explicit component entry) and to standard HTML tags absent from the built-in
  component set (e.g. <span>, <em>, <div>, <br>). Built-in and explicit
  components entries always win — this is not a full unstyled mode.

  Refs Make tailwind optional #543

Patch Changes

• c971f42: Wire onCopy and onError through default code and Mermaid copy controls via controls.code.copy and controls.mermaid.copy.

• 163c63b: fix(code-block): use absolute positioning for action buttons to fix click events in nested scroll containers

  Switches the code block action button wrapper from position: sticky to
  position: absolute (with position: relative on the container) so that
  hit-testing works correctly in layouts with multiple nested overflow: auto
  scroll containers. Previously, the sticky + pointer-events-none/auto
  pattern caused browsers to mis-route click events to the code block wrapper
  rather than the buttons when the component was embedded in 2+ nested scroll
  containers.

• e0ce123: Incomplete images during streaming now render a loading placeholder instead of being removed entirely. Incomplete images (e.g. ![alt](https://exampl) are replaced with ![alt](streamdown:incomplete-image) by remend, and the streamdown ImageComponent renders an animated skeleton for this special URL. This mirrors the existing behavior for incomplete links (streamdown:incomplete-link). The streamdown protocol is allowlisted for img[src] in the default sanitize schema so the sentinel survives rehype-sanitize + rehype-harden.

• 5b26c28: Speed up block parsing by lexing only block tokens and reusing already parsed blocks while a document streams.

• 18dcb20: Add a top-level portal prop for configuring the container used by Mermaid fullscreen, table fullscreen, and the built-in link safety modal.

• fdf4e33: Fix Mermaid diagrams so text is readable and diagrams auto-fit container.

  • Normalize SVG to remove responsive shrinking
  • Extract intrinsic size from viewBox
  • Add width-and-height auto-fit in PanZoom
  • Preserve user zoom/pan after initial fit
  • Add tests for SVG utilities and auto-fit behavior

• 53812cf: fix: unwrap a single paragraph child inside list items

  Loose list items from the markdown pipeline are often wrapped in a <p>. MemoLi now detects that sole paragraph child (including the memoized paragraph component) and renders its contents directly, so list items stay visually tight. Also updates the list animation retrigger test to match the unwrapped markup.

  Fixes Blank lines between list items cause unwanted <p> wrapping inside <li> #475

• a155a9e: Update marked from ^17.0.1 to ^18.0.11.

  marked v18 no longer folds a block token's trailing blank line(s) into its own raw; that whitespace now surfaces as a separate space token immediately following the block (e.g. after html, heading, and table tokens). This changed the token stream shape that parseMarkdownIntoBlocks consumes, causing a dangling space token after a closed custom-tag HTML block to be emitted as its own standalone block. parseMarkdownIntoBlocks now folds a space token into the preceding block instead of pushing it as a new one, restoring v17-identical block boundaries and counts. The lossless token.raw concatenation invariant is preserved.

• Updated dependencies [e0ce123]

  • remend@1.3.2

remend@1.3.2

Patch Changes

• e0ce123: Incomplete images during streaming now render a loading placeholder instead of being removed entirely. Incomplete images (e.g. ![alt](https://exampl) are replaced with ![alt](streamdown:incomplete-image) by remend, and the streamdown ImageComponent renders an animated skeleton for this special URL. This mirrors the existing behavior for incomplete links (streamdown:incomplete-link). The streamdown protocol is allowlisted for img[src] in the default sanitize schema so the sentinel survives rehype-sanitize + rehype-harden.

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Project	Deployment	Actions	Updated
streamdown	Ready	Preview, v0	Sep 14, 2026 3:28pm UTC