Fix Markdoc custom transform dropped for tag/node names with dashes

[eldardada]

Changes

Custom Markdoc transform functions were being dropped for tags and nodes whose names need bracket access, like side-note.

Here is why. When you set a custom render component, resolveComponentImports removes the transform unless that transform "respects" render (issue #9708, added in #15335). It worked that out by string-matching the transform's source for config.tags?.<key>?.render or config.nodes?.<key>?.render, which only covers dot notation.

A key like side-note can't be read with dot notation at all (config.tags?.side-note?.render parses as a subtraction), so those transforms have to use bracket notation: config.tags?.['side-note']?.render. The old check never matched that, so the transform was always treated as not respecting render and deleted, which broke the tag.

The detection now handles bracket notation alongside dot notation, plus optional chaining and whitespace. Includes a changeset (@astrojs/markdoc patch).

Fixes #17118.

Testing

Added packages/integrations/markdoc/test/resolve-component-imports.test.ts, a unit test over the exported resolveComponentImports:

• a render-respecting transform on a dashed tag (side-note, via bracket access) is kept;
• a transform that does not respect render is still removed so render wins.

I checked it both ways: the first case fails on main (transform deleted) and passes with this change. The full package suite is green too. pnpm --filter @astrojs/markdoc test runs 50 tests, including the existing render-with-transform test for #9708. tsc -b, biome check, prettier --check, and eslint are all clean on the changed files.

Docs

No docs changes. This restores the documented behavior (a custom render together with a custom transform) for tag and node names that contain dashes, and there is no public API change.

[changeset-bot]

🦋 Changeset detected

Latest commit: 391e07a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 24 packages

Name	Type
@astrojs/markdoc	Patch
@performance/mdoc	Patch
@test/content-intellisense	Patch
@test/core-image-deletion	Patch
@test/markdoc-content-collections	Patch
@test/content-layer-markdoc	Patch
@test/headings-custom	Patch
@test/headings	Patch
@test/image-assets-custom	Patch
@test/image-assets	Patch
@test/markdoc-propagated-assets	Patch
@test/markdoc-render-with-space	Patch
@test/markdoc-render-html	Patch
@test/markdoc-render-null	Patch
@test/markdoc-render-partials	Patch
@test/markdoc-render-simple	Patch
@test/markdoc-render-table-attrs	Patch
@test/markdoc-render-typographer	Patch
@test/markdoc-render-with-components	Patch
@test/markdoc-render-with-config	Patch
@test/markdoc-render-with-extends-components	Patch
@test/markdoc-render-with-indented-components	Patch
@test/markdoc-render-with-transform	Patch
@test/markdoc-variables	Patch

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