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feat(linter/unicorn): implement no-useless-iterator-to-array rule#20945

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camc314 merged 3 commits intooxc-project:mainfrom
baevm:unicorn/no_useless_iterator_to_array
Apr 5, 2026
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feat(linter/unicorn): implement no-useless-iterator-to-array rule#20945
camc314 merged 3 commits intooxc-project:mainfrom
baevm:unicorn/no_useless_iterator_to_array

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@baevm baevm commented Apr 1, 2026

this PR implements unicorn/no-useless-iterator-to-array rule, issue #684

@github-actions github-actions bot added A-linter Area - Linter C-enhancement Category - New feature or request labels Apr 1, 2026
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codspeed-hq bot commented Apr 1, 2026

Merging this PR will not alter performance

✅ 4 untouched benchmarks
⏩ 47 skipped benchmarks1


Comparing baevm:unicorn/no_useless_iterator_to_array (774d420) with main (af89923)

Open in CodSpeed

Footnotes

  1. 47 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.

@baevm baevm force-pushed the unicorn/no_useless_iterator_to_array branch from 201c091 to af459db Compare April 2, 2026 07:11
@baevm baevm marked this pull request as ready for review April 2, 2026 07:11
@baevm baevm requested a review from camc314 as a code owner April 2, 2026 07:11
Copilot AI review requested due to automatic review settings April 2, 2026 07:11
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baevm commented Apr 2, 2026

@codex code review

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To use Codex here, create an environment for this repo.

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Pull request overview

Implements the unicorn/no-useless-iterator-to-array lint rule in oxc_linter, adding diagnostics for unnecessary Iterator.prototype.toArray() calls in contexts that accept iterables directly.

Changes:

  • Added a new Unicorn rule implementation with coverage for new expressions, static calls (e.g. Array.from, Promise.all), for…of, yield*, and spread contexts.
  • Added rule tests and a new snapshot to validate diagnostics output.
  • Registered the rule across the linter’s module tree and generated rule enums/runners.

Reviewed changes

Copilot reviewed 3 out of 5 changed files in this pull request and generated 1 comment.

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File Description
crates/oxc_linter/src/rules/unicorn/no_useless_iterator_to_array.rs New rule implementation + unit tests for detecting unnecessary .toArray() usage.
crates/oxc_linter/src/snapshots/unicorn_no_useless_iterator_to_array.snap New snapshot covering diagnostics emitted by the rule tests.
crates/oxc_linter/src/rules.rs Exposes the new Unicorn rule module.
crates/oxc_linter/src/generated/rules_enum.rs Registers the rule in the generated rule enum, IDs, metadata wiring, and factory.
crates/oxc_linter/src/generated/rule_runner_impls.rs Adds AST node-type wiring so the runner invokes the rule on relevant nodes.

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Thank yoU!

@camc314 camc314 merged commit 7fdf722 into oxc-project:main Apr 5, 2026
24 of 25 checks passed
leaysgur pushed a commit that referenced this pull request Apr 7, 2026
# Oxlint
### 💥 BREAKING CHANGES

- 22ce6af oxlint/lsp: [**BREAKING**] Show/fix safe suggestions by
default (#19816) (Sysix)

### 🚀 Features

- 7a7b7b8 oxlint/lsp: Add source.fixAllDangerous.oxc code action kind
(#20526) (bab)
- 9cfe57e linter/unicorn: Implement prefer-import-meta-properties rule
(#20662) (Irfan - ئىرفان)
- 1edb391 linter/eslint: Implement `no-restricted-exports` rule (#20592)
(Nicolas Le Cam)
- 0f12bcd linter/react: Implement `hook-use-state` rule (#20986) (Khaled
Labeb)
- 1513a9f oxlint/lsp: Show note field for lsp diagnostic (#20983)
(Sysix)
- 7fdf722 linter/unicorn: Implement `no-useless-iterator-to-array` rule
(#20945) (Mikhail Baev)
- 39c8f2c linter/jest: Implement padding-around-after-all-blocks
(#21034) (Sapphire)
- ac39e51 linter/eslint-vitest-plugin: Prefer importing vitest globals
(#20960) (Said Atrahouch)
- 0b84de1 oxlint: Support allow option for prefer-promise-reject-errors
(#20934) (camc314)
- 23db851 linter/consistent-return: Move rule from nursery to suspicious
(#20920) (camc314)
- 9a27e32 linter/no-unnecessary-type-conversion: Move rule from nursery
to suspicious (#20919) (camc314)
- 1ca7b58 linter/dot-notation: Move rule from nursery to style (#20918)
(camc314)
- 73ba81a linter/consistent-type-exports: Move rule from nursery to
style (#20917) (camc314)
- b9199b1 linter/unicorn: Implement switch-case-break-position (#20872)
(Mikhail Baev)
- 3435ff8 linter: Implements `prefer-snapshot-hint` rule in Jest and
Vitest (#20870) (Said Atrahouch)
- 98510d2 linter: Implement react/prefer-function-component (#19652)
(Connor Shea)
- 871f9d9 linter: Implement no-useless-assignment (#15466) (Zhaoting
Zhou)
- 0f01fbd linter: Implement eslint/object-shorthand (#17688) (yue)

### 🐛 Bug Fixes

- dd2df87 npm: Export package.json for oxlint and oxfmt (#20784) (kazuya
kawaguchi)
- 9bc77dd linter/no-unused-private-class-members: False positive with
await expr (#21067) (camc314)
- 60a57cd linter/const-comparisons: Detect equality contradictions
(#21065) (camc314)
- 2bb2be2 linter/no-array-index-key: False positive when index is passed
as function argument (#21012) (bab)
- 6492953 linter/no-this-in-sfc: Only flag `this` used as member
expression object (#20961) (bab)
- 9446dcc oxlint/lsp: Skip `node_modules` in oxlint config walker
(#21004) (copilot-swe-agent)
- af89923 linter/no-namespace: Support glob pattern matching against
basename (#21031) (bab)
- 64a1a7e oxlint: Don't search for nested config outside base config
(#21051) (Sysix)
- 3b953bc linter/button-has-type: Ignore `document.createElement` calls
(#21008) (Said Atrahouch)
- 8c36070 linter/unicorn: Add support for `Array.from()` for
`prefer-set-size` rule (#21016) (Mikhail Baev)
- c1a48f0 linter: Detect vitest import from vite-plus/test (#20976)
(Said Atrahouch)
- 5c32fd1 lsp: Prevent corrupted autofix output from overlapping text
edits (#19793) (Peter Wagenet)
- ca79960 linter/no-array-index-key: Move span to `key` property
(#20947) (camc314)
- 2098274 linter: Add suggestion for `jest/prefer-equality-matcher`
(#20925) (eryue0220)
- 6eb77ec linter: Allow default-import barrels in import/named (#20757)
(Bazyli Brzóska)
- 9c218ef linter/eslint-vitest-plugin: Remove pending fix status for
require-local-test-context-for-concurrent-snapshot (#20890) (Said
Atrahouch)

### ⚡ Performance

- fb52383 napi/parser, linter/plugins: Clear buffers and source texts
earlier (#21025) (overlookmotel)
- 3b7dec4 napi/parser, linter/plugins: Use `utf8Slice` for decoding
UTF-8 strings (#21022) (overlookmotel)
- 012c924 napi/parser, linter/plugins: Speed up decoding strings in raw
transfer (#21021) (overlookmotel)
- 55e1e9b napi/parser, linter/plugins: Initialize vars as 0 (#21020)
(overlookmotel)
- c25ef02 napi/parser, linter/plugins: Simplify branch condition in
`deserializeStr` (#21019) (overlookmotel)
- 9f494c3 napi/parser, linter/plugins: Raw transfer use
`String.fromCharCode` in string decoding (#21018) (overlookmotel)
- 0503a78 napi/parser, linter/plugins: Faster deserialization of `raw`
fields (#20923) (overlookmotel)
- a24f75e napi/parser: Optimize string deserialization for non-ASCII
sources (#20834) (Joshua Tuddenham)

### 📚 Documentation

- af72b80 oxlint: Fix typo for --tsconfig (#20889) (leaysgur)
- 70c53b1 linter: Highlight that tsconfig is not respected in type aware
linting (#20884) (camc314)
# Oxfmt
### 🚀 Features

- 35cf6e8 oxfmt: Add node version hint for ts config import failures
(#21046) (camc314)

### 🐛 Bug Fixes

- dd2df87 npm: Export package.json for oxlint and oxfmt (#20784) (kazuya
kawaguchi)
- 9d45511 oxfmt: Propagate file write errors instead of panicking
(#20997) (leaysgur)
- 139ddd9 formatter: Handle leading comment after array elision (#20987)
(leaysgur)
- 4216380 oxfmt: Support `.editorconfig` `tab_width` fallback (#20988)
(leaysgur)
- d10df39 formatter: Resolve pending space in fits measurer before
expanded-mode early exit (#20954) (Dunqing)
- f9ef1bd formatter: Avoid breaking after `=>` when arrow body has JSDoc
type cast (#20857) (bab)

Co-authored-by: Boshen <1430279+Boshen@users.noreply.github.com>
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