refactor(tiptap): extract shared isProseMirrorDoc guard, drop 3 as-casts - #2121
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tiptap/types.ts (extractMentions, docToPlainText) and tiptap/first-paragraph.ts (extractFirstParagraph) each hand-rolled the same runtime shape check (typeof d === "object" && d.type === "doc" && Array.isArray(d.content)) and then cast the value with `as ProseMirrorDoc`. Consolidate that into a single `isProseMirrorDoc(value: unknown): value is ProseMirrorDoc` type guard in types.ts and reuse it at all three sites. The guard narrows with `typeof`/`in`/`Array.isArray` and carries no `as` cast of its own, so the three unsafe `as ProseMirrorDoc` downcasts disappear (CORE-TS-007, Rule-of-Three). Behavior is unchanged — the guard is exactly equivalent to each former inline check for every input class. Adds direct unit coverage for the guard (valid/malformed/nullish/primitive/ array inputs) plus malformed-input assertions on extractMentions and docToPlainText to lock in the delegated default-return behavior. Bead: PP-h038 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01B3R5MgzzDRjH7bEymgzdPa
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📝 WalkthroughWalkthroughThe PR adds a shared ChangesProseMirror validation
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~15 minutes Change: Refactor Merge Risk: 🟡 Moderate · up to Malformed stored or supplied document content containing an invalid child can now crash mention, plain-text, or first-paragraph extraction instead of returning the documented empty fallback. Validate child nodes before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@src/lib/tiptap/types.ts`:
- Line 65: Update isProseMirrorDoc to recursively validate every child in
content before narrowing to ProseMirrorDoc, rejecting null, non-node values, and
invalid nested content arrays. Preserve the existing malformed-input fallback
behavior in extractMentions, docToPlainText, and extractFirstParagraph, and add
coverage for null and invalid nested nodes.
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src/lib/tiptap/first-paragraph.tssrc/lib/tiptap/types.test.tssrc/lib/tiptap/types.ts
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What
Consolidates a duplicated ProseMirror-doc shape check into a single type guard and removes three unsafe
as ProseMirrorDoccasts (CORE-TS-007, Rule-of-Three). Implements PP-h038.Three functions each hand-rolled the same runtime check —
typeof d === "object" && d.type === "doc" && Array.isArray(d.content)— and then cast the value withas ProseMirrorDoc:src/lib/tiptap/types.ts→extractMentionssrc/lib/tiptap/types.ts→docToPlainTextsrc/lib/tiptap/first-paragraph.ts→extractFirstParagraphHow
isProseMirrorDoc(value: unknown): value is ProseMirrorDoctotypes.ts, next to the other doc helpers. It narrows withtypeof/in/Array.isArrayand carries noascast of its own — so all threeas ProseMirrorDocdowncasts disappear, and each call site now narrows via the guard.{ type: "doc" }, non-arraycontent, wrong type, null/undefined/string/number/array/{}). No behavior change.Tests
isProseMirrorDoc(valid, malformed, nullish, primitive, array inputs, plus thecontent: undefinedbranch).extractMentionsanddocToPlainTextto lock in the delegated default-return wiring.src/lib/tiptap/unit tests: 34 pass.typecheck,typecheck:tests,oxlint, andprettierall clean. (Fullpnpm run checkcouldn't complete in this cloud sandbox only becauseyamllintisn't installed — unrelated to this diff.)Scope
Deliberately limited to the three shape-check-then-cast sites the bead named. Other
as ProseMirrorDoccasts in the repo are deserialization-boundary casts (JSON.parse(...),editor.getJSON()) of a different character and are out of scope here.ownerless). Opened by the automated nightly bead session — no session is watching its CI or driving review. It reached review genuinely unreviewed (the nightly's subagent review is its own and does not attest a human/Codex review). An orchestrator or Tim should pick it up from theownerlessqueue.🤖 Generated with Claude Code
https://claude.ai/code/session_01B3R5MgzzDRjH7bEymgzdPa
Generated by Claude Code
Summary by CodeRabbit
Bug Fixes
Tests