feat(core): hide the noLink magic comment in every mark mode

[ocavue]

The noLink magic comment is editor metadata, so it now renders as an always-hidden mdMagic run in every mark mode instead of dim source text in show mode. The hidden-run caret rules (snap, Enter relocation, backspace dissolve) now cover magic runs in focus and show mode too, so deleting into the comment removes it whole and the URL autolinks again.

Summary by CodeRabbit

• New Features
  • Added support for preserving noLink magic comments through Markdown conversion and clipboard operations.
  • Magic comments remain hidden in all display modes while retaining their underlying metadata.
  • Improved caret navigation, editing, deletion, undo, and autolinking behavior around hidden magic comments.
• Bug Fixes
  • Fixed inconsistent handling of hidden comments across show, focus, and hide modes.
  • Ensured semantic clipboard output excludes magic comments while preserving them in Markdown data.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
meowdown	Ready	Preview	Aug 30, 2026 4:18pm

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 78b57218-3fbc-480b-8b4b-aaef969bdc75

📥 Commits

Reviewing files that changed from the base of the PR and between cd582b7 and 109cdd4.

📒 Files selected for processing (15)

• packages/core/src/converters/roundtrip.test.ts
• packages/core/src/extensions/clipboard/plain-text.test.ts
• packages/core/src/extensions/clipboard/semantic-inline.test.ts
• packages/core/src/extensions/hidden-run-caret.test.ts
• packages/core/src/extensions/hidden-run-caret.ts
• packages/core/src/extensions/hidden-run.ts
• packages/core/src/extensions/inline-marks.ts
• packages/core/src/extensions/inline-text-to-mark-chunks.test.ts
• packages/core/src/extensions/inline-text-to-mark-chunks.ts
• packages/core/src/extensions/mark-mode.test.ts
• packages/core/src/extensions/mark-names.ts
• packages/core/src/extensions/virtual-caret.ts
• packages/core/src/style.css
• packages/core/src/testing/selection-snapshot.ts
• packages/react/src/components/markdown-view.test.tsx

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

---

📝 Walkthrough

Walkthrough

The change adds the mdMagic mark for noLink comments. URL conversion, visibility, caret handling, clipboard serialization, rendering, and markdown roundtrips now preserve or hide these comments according to the active mode.

Changes

Magic comment handling

Layer / File(s)	Summary
Magic comment representation and URL conversion packages/core/src/extensions/mark-names.ts, packages/core/src/extensions/inline-marks.ts, packages/core/src/extensions/inline-text-to-mark-chunks.ts, packages/core/src/extensions/*test.ts	mdMagic is registered as Markdown syntax. noLink comments are attached to URL units with the mdMagic mark.
Hidden-run predicate and caret interaction packages/core/src/extensions/hidden-run.ts, packages/core/src/extensions/hidden-run-caret.ts, packages/core/src/extensions/virtual-caret.ts, packages/core/src/testing/selection-snapshot.ts, packages/core/src/extensions/hidden-run-caret.test.ts	Hidden-run operations use the active mode predicate. Caret movement, splitting, deletion, undo, and caret-tail calculation cover magic comments in show and focus modes.
Rendering, clipboard, and roundtrip behavior packages/core/src/style.css, packages/core/src/extensions/clipboard/*, packages/core/src/extensions/mark-mode.test.ts, packages/core/src/converters/roundtrip.test.ts, packages/react/src/components/markdown-view.test.tsx	Magic comments render as zero-width spans. Clipboard and roundtrip tests verify comment preservation or removal by mode.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: ⚪ Minimal · up to 109cd

The change hides noLink metadata consistently and preserves atomic deletion and URL relinking across mark modes; no actionable merge-blocking risk remains beyond normal checks and review.

Suggested reviewers: maccman

Sequence Diagram(s)

sequenceDiagram
  participant MarkdownInput
  participant walkUnlinkedURL
  participant ProseMirrorDocument
  participant getHiddenPredicate
  participant createSnapPlugin
  MarkdownInput->>walkUnlinkedURL: URL followed by noLink comment
  walkUnlinkedURL->>ProseMirrorDocument: create mdPack and mdMagic
  ProseMirrorDocument->>getHiddenPredicate: active mark mode
  getHiddenPredicate-->>createSnapPlugin: hidden-run predicate
  createSnapPlugin->>ProseMirrorDocument: adjust caret position

Loading

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 76.19% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 21 functions across 14 files. (1 skipped:…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: hiding the noLink magic comment in every mark mode. It matches the pull request objectives and changes.

Full details: Docstring Coverage

Explanation

Docstring coverage is 76.19% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 21 functions across 14 files. (1 skipped: 1 unsupported.)

• Fix all pre-merge checks with AI

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch magic-comment-hidden-all-modes

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@meowdown/core@523

npm i https://pkg.pr.new/@meowdown/markdown@523

npm i https://pkg.pr.new/@meowdown/react@523

commit: 109cdd4

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	94.1%	5093 / 5412
🔵	Statements	91.82%	5754 / 6266
🔵	Functions	92%	1219 / 1325
🔵	Branches	87.82%	3728 / 4245

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
packages/core/src/style.css	0%	0%	0%	0%
packages/core/src/extensions/hidden-run-caret.ts	92.18%	86.53%	100%	94.23%	39, 103, 127, 136-137
packages/core/src/extensions/hidden-run.ts	93.91%	91.81%	100%	100%	49, 104, 106, 123, 126, 146, 213
packages/core/src/extensions/inline-marks.ts	88.88%	0%	91.17%	88.88%	125-126, 187, 249
packages/core/src/extensions/inline-text-to-mark-chunks.ts	95.45%	92.38%	100%	96.65%	345, 357, 376-377, 515, 524, 576, 677, 732, 778-779, 882
packages/core/src/extensions/mark-names.ts	100%	100%	100%	100%
packages/core/src/extensions/virtual-caret.ts	99.08%	94.33%	100%	100%	124
packages/core/src/testing/selection-snapshot.ts	100%	100%	100%	100%

Generated in workflow #2079 for commit 109cdd4 by the Vitest Coverage Report Action