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feat(oxlint-config): reject formatter ignores that cover a workspace package - #212

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fix/fmt-ignore-workspace-roots
Oct 22, 2026
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fix/fmt-ignore-workspace-roots

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The formatter policy now rejects a repository ignorePatterns entry in bunfig.toml [fmt] that covers a workspace package, so bun fmt --check cannot silently skip package sources.

Workspace packages are the directories of the manifests that the root workspaces globs select (array or { packages } form). A pattern covers a package when, read with ignore-file semantics (a match on the path or any ancestor, anywhere when the pattern has no inner slash), it matches the package manifest or src/index.ts. Negations and the shared generated-file patterns are skipped. Patterns for generated or vendored paths inside a package, such as packages/benchmark/vendor/**, stay allowed, and so do directories outside the workspaces (for example npm/ platform packages).

Tests cover the array and object workspace forms, narrow allowed patterns, and rejected directory, subtree, catch-all, unanchored and source-glob patterns.

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Reviewing files that changed from the base of the PR and between 181bd25 and a2f9c45.

📒 Files selected for processing: 3
  • .changeset/fmt-ignore-workspace-roots.md
  • packages/oxlint-config/src/toolchain-formatter.test.ts
  • packages/oxlint-config/src/toolchain-formatter.ts
📝 Walkthrough

The formatter check now discovers workspace package roots and evaluates bunfig.toml ignore patterns against representative package paths. It reports non-shared patterns that cover those paths, accounting for anchored patterns, negations, and excluded directories. Tests cover workspace declarations and pattern cases.

Changes: Workspace formatter policy

Layer / File(s) Summary
Discover workspace roots and evaluate ignore patterns
packages/oxlint-config/src/toolchain-formatter.ts
The checker discovers workspace package roots and evaluates ignore patterns against representative paths. Matching accounts for anchored and unanchored patterns, ordered negations, and excluded directories.
Report ignored workspace paths
packages/oxlint-config/src/toolchain-formatter.ts, packages/oxlint-config/src/toolchain-formatter.test.ts, .changeset/fmt-ignore-workspace-roots.md
The formatter check reports patterns that cover workspace package paths, except patterns in the shared policy’s ignorePatterns. The caller supplies discovered package roots. Tests cover workspace declaration shapes and pattern cases. A changeset records the formatter policy.

Priority: ⚪ Pending latest changes

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Possibly related PRs

  • stella/tooling#202: Introduces the formatter-policy contract for bunfig.toml [fmt] and the checkFormatter checker extended by this change.
Merge Risk: 🔵 Low · up to 181bd

The new formatter-ignore check can miss one unusual pattern ordering, where a file-specific ignore is followed by a negation of its parent directory. This is a narrow gap in a new policy check and does not affect runtime behavior, so it can be fixed in a follow-up.

Pre-merge checks: Passed 5
Check name Status Explanation
Description check Passed The description clearly explains the formatter policy change, workspace package detection, ignore-pattern behaviour, and test coverage.
Title check Passed The title clearly and concisely states the main change: rejecting formatter ignore patterns that cover workspace packages.
Docstring Coverage Passed No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
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.
Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 1

🧹 Nitpick comments: 1
packages/oxlint-config/src/toolchain-formatter.ts: 1

280-280: 📐 Maintainability & Code Quality | 🔵 Trivial | 💤 Low value

Pass the formatter-check inputs in a named options object.

checkFormatConfig now takes three positional arguments. Use a named options type at the declaration and call site. As per coding guidelines: “Use a named SomethingOptions, SomethingArgs, or SomethingParams object for 3+ arguments.”

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Review comment at @packages/oxlint-config/src/toolchain-formatter.ts at line
280:
Update the checkFormatConfig declaration and its call site to use a named
options object instead of three positional arguments; define a named options
type that groups the existing inputs and preserve their current behaviour.

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Inline comments:
Review comments at @packages/oxlint-config/src/toolchain-formatter.ts:
- Line 272: Update the ignore-negation handling around `directoryExcluded` so a
negation matching only an ancestor directory does not clear the file-specific
match in `active`; clear it only when the negation also applies to the file. Add
a regression case using the `packages/mcp/src/index.ts` ignore and
`packages/mcp/src/` negation.

---

Nitpick comments:
Review comments at @packages/oxlint-config/src/toolchain-formatter.ts:
- Line 280: Update the checkFormatConfig declaration and its call site to use a
named options object instead of three positional arguments; define a named
options type that groups the existing inputs and preserve their current
behaviour.

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Comment thread packages/oxlint-config/src/toolchain-formatter.ts
@jan-kubica
jan-kubica added this pull request to the merge queue Oct 22, 2026
Merged via the queue into main with commit ddd6275 Oct 22, 2026
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