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fix(linter/no-loop-func): allow safe let closures#22811

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May 28, 2026
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fix(linter/no-loop-func): allow safe let closures#22811
graphite-app[bot] merged 1 commit into
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@camc314 camc314 commented May 28, 2026

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Oxlint’s eslint/no-loop-func was reporting safe closures that ESLint allows, including callbacks capturing let bindings from containing for loop headers and outer let values only written before the loop.

This updates the let safety check to match ESLint more closely and adds a regression test for the reported false positives.

fixes #22804

Copilot AI review requested due to automatic review settings May 28, 2026 19:49
@camc314 camc314 self-assigned this May 28, 2026
@github-actions github-actions Bot added the A-linter Area - Linter label May 28, 2026

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@camc314 camc314 changed the title fix(linter): allow safe let closures in no-loop-func fix(linter/no-loop-func): allow safe let closures May 28, 2026
@camc314 camc314 requested a review from Copilot May 28, 2026 19:53

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@camc314 camc314 added the 0-merge Merge with Graphite Merge Queue label May 28, 2026

camc314 commented May 28, 2026

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codspeed-hq Bot commented May 28, 2026

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Merging this PR will not alter performance

✅ 5 untouched benchmarks
⏩ 52 skipped benchmarks1


Comparing codex/fix-no-loop-func-let-scope (649a977) with main (8422e8b)2

Open in CodSpeed

Footnotes

  1. 52 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports.

  2. No successful run was found on main (1599f11) during the generation of this report, so 8422e8b was used instead as the comparison base. There might be some changes unrelated to this pull request in this report.

Oxlint’s `eslint/no-loop-func` was reporting safe closures that ESLint allows, including callbacks capturing `let` bindings from containing `for` loop headers and outer `let` values only written before the loop.

This updates the `let` safety check to match ESLint more closely and adds a regression test for the reported false positives.

fixes #22804
@graphite-app graphite-app Bot force-pushed the codex/fix-no-loop-func-let-scope branch from 649a977 to 0a9a735 Compare May 28, 2026 20:02
@graphite-app graphite-app Bot merged commit 0a9a735 into main May 28, 2026
29 checks passed
@graphite-app graphite-app Bot removed the 0-merge Merge with Graphite Merge Queue label May 28, 2026
@graphite-app graphite-app Bot deleted the codex/fix-no-loop-func-let-scope branch May 28, 2026 20:07
camc314 pushed a commit that referenced this pull request Jun 1, 2026
# Oxlint
### 🚀 Features

- e4b1f46 linter/typescript: Implement `method-signature-style` rule
(#22679) (Mikhail Baev)
- bc462ca linter/vue: Implement no-reserved-component-names rule
(#22741) (bab)
- ef9e751 linter/vue: Implement component-definition-name-casing rule
(#22818) (bab)
- d67f51a linter/vue: Implement require-prop-type-constructor rule
(#22708) (bab)
- 1444f82 linter/promise/spec-only: Add `Promise.try` to `Promise`
static methods (#22812) (Ben Saufley)
- 8422e8b linter/jsdoc: Implement `require-yields-description` rule
(#22805) (Mikhail Baev)
- fe93f97 linter/eslint: Implement `prefer-named-capture-group` rule
(#22759) (Sebastian Poxhofer)
- 1a7798b linter: Add suggestion for `unicorn/no-new-array` (#22682)
(Sysix)

### 🐛 Bug Fixes

- 760a9f9 linter: Report errors when writing to the filesystem (#22881)
(camc314)
- e5a2748 linter: Avoid no-unreachable false positive after conditional
loop (#22869) (camc314)
- 39d92d6 linter/arrow-body-style: Preserve comments within function
(#22854) (Sysix)
- 3d13e29 parser: Reject `declare` in an already-ambient context
(TS1038) (#22850) (Boshen)
- 5152854 parser: Reject statements in ambient contexts (TS1036)
(#22849) (Boshen)
- 2eafea6 parser: Reject function implementations in ambient contexts
(TS1183) (#22845) (Boshen)
- c645615 parser: Reject incompatible class member modifiers (#22843)
(Boshen)
- 4a1ca4a linter/export: Detect duplicate explicit exports (#22798)
(camc314)
- 0a9a735 linter/no-loop-func: Allow safe let closures (#22811)
(camc314)
- 1599f11 linter: Align lsp extends default plugins (#22788) (camc314)
- db32ec9 linter/no-accumulating-spread: Use loop as primary span
(#22800) (camc314)
- 33ec6b4 linter/consistent-test-it: Avoid adjacent describe leakage
(#22796) (camc314)
- 2606069 linter/no-array-sort: Unwrap parenthesized sort args (#22794)
(camc314)
- 9f2f709 linter/no-array-sort: Skip non compare fn sort arguments
(#22752) (Gaurav Dubey)
- 27268a0 linter/no-else-return: Preserve statement boundary in fixer
(#22687) (camc314)
- d9cb6d8 linter/no-empty-function: Allow functions callbacks with
`allow: functions` (#22764) (camc314)
- a40a314 linter/no-shadow-restricted-names: Ignore enum members
(#22762) (camc314)
- 82366d9 linter/no-cond-assign: Align ternary handling (#22761)
(camc314)

### 📚 Documentation

- 5e113ba linter: Add license notices for ported ESLint plugins (#22768)
(Boshen)
# Oxfmt
### 🚀 Features

- d75cbbf oxfmt: Format `parser:json` files by `oxc_formatter_json`
(#22709) (leaysgur)
- 49db054 formatter_json: Implement `oxc_formatter_json` (json variant
only) (#22641) (leaysgur)
- 9c71f2e ast, codegen, formatter: Add `WithClauseKeyword::as_str`
helper and use it (#22791) (camc314)

### 🐛 Bug Fixes

- d3cdd62 oxfmt: Skip formatting for whitespace-only file (#22780)
(leaysgur)
- 23f0cc8 formatter: Don't move comments inside variable declaration in
for in loop (#22776) (leaysgur)
- f200c40 formatter: Don't move comments inside variable declaration in
for of loop (#22773) (Leonabcd123)

### 📚 Documentation

- 845f393 oxfmt,formatter,formatter_json,formatter_core: Add/update
AGENTS.md (#22873) (leaysgur)
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linter: eslint/no-loop-func flags safe let-scoped callbacks

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