WORK-418
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ID:WORK-418Status:done

Image-src scheme registry + resolver hook

The foundation for SPEC-106: recognise custom URL schemes in a Markdown image's src during the transform and resolve them to a renderable, before the generic <img> fallback. Custom schemes (placeholder:, icon:) already survive markdown-it's validateLink, so ![alt](scheme:arg) arrives as an image node with src intact.

Priority:mediumComplexity:moderateMilestone:v0.22.0Source:SPEC-106
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Criteria completion

Criteria completion: 3 of 3 (100%) checked; tracking started on Jun 13, no incremental history yet0%25%50%75%100%Jun 13Jun 15

Tracking started Jun 13 — check back for trends.

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Implements 1
Related 3
Branches 3
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claude/spec-106-image-src-schemes doneclaude/spec-image-src-scheme-sugar readymain done

Scope

  • Extend the image schema transform (packages/runes/src/nodes.ts) with a small scheme → resolver registry. Each resolver receives the argument (after scheme:) plus the node's alt/title/property and returns a renderable Tag (typically an inline <svg>, mirroring the existing svgFiles inline-SVG branch).
  • Unrecognised schemes (and ordinary paths/URLs) fall through to the normal <img> path unchanged.
  • Establish the registry so the icon: (WORK-419) and placeholder: (WORK-420) resolvers plug in; ship neither resolver here (a no-op/test resolver proves the hook).

Acceptance Criteria

  • The image transform matches src against a scheme registry before the <img> fallback; a registered resolver's returned Tag replaces the <img>.
  • Unknown schemes, relative paths, and absolute URLs pass through to <img> unchanged (existing svgFiles behaviour preserved).
  • Resolvers receive the scheme argument + alt/title/property; a unit test exercises the hook with a stub resolver.

References

  • SPEC-106 · packages/runes/src/nodes.ts (the image schema transform).

Resolution

Completed: 2026-06-13

Branch: claude/spec-106-image-src-schemes

What was done

  • Added packages/runes/src/lib/image-schemes.ts — a scheme → resolver registry (registerImageScheme, hasImageScheme, resolveImageScheme). Schemes are matched by the leading run before the first colon per URI generic syntax; bare paths, absolute URLs, and data: URIs never match and fall through.
  • Wired the hook into the image schema transform (packages/runes/src/nodes.ts): resolution runs before path-joining and the <img> fallback; a resolved Tag replaces the <img> and inherits data-field when property is set. The existing svgFiles inline-SVG branch is preserved untouched.
  • Exported the registry API from @refrakt-md/runes so plugins can register their own schemes.
  • Tests in packages/runes/test/image-schemes.test.ts exercise the hook with a stub resolver (arg + alt/title/property), img replacement, and unknown-scheme/path passthrough.

Notes

  • Resolver signature: (arg, { alt, title, property, config }) => Tag | null. Returning null is reserved for future opt-out; the core resolvers always return a Tag.