fix(eslint-plugin): [switch-exhaustiveness-check] always sort literal cases in stable order by JoshuaKGoldberg · Pull Request #12885 · typescript-eslint/typescript-eslint

JoshuaKGoldberg · 2026-09-15T19:05:21Z

PR Checklist

Addresses an existing open issue: groundwork for feat(typescript-estree): add projectService.EXPERIMENTAL_backend for TypeScript 7.1 native parser support over IPC #12803
That issue was marked as accepting prs
Steps in Contributing were taken

Overview

switch-exhaustiveness-check currently adds missing cases based on whatever the compiler gives back. Which in tests used to be one ordering (roughly alphabetical), but with TS7.1 / stableTypeOrdering can now be different.

The rule needs to not be different in TS 5/6 vs. TS 7 / stableTypeOrdering. Both in general to not confuse users or be inconvenient when they upgrade, and so that our own test suites in #12803 show the same rule reports.

This PR changes the rule to manually sort missing cases using the existing naive typeToString.

💖

typescript-eslint · 2026-09-15T19:05:24Z

Thanks for the PR, @JoshuaKGoldberg!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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nx-cloud · 2026-09-15T19:06:13Z

View your CI Pipeline Execution ↗ for commit 6341ff6

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☁️ Nx Cloud last updated this comment at 2026-09-20 15:36:01 UTC

codecov · 2026-09-16T00:56:14Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.00%. Comparing base (8f141a2) to head (6341ff6).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12885   +/-   ##
=======================================
  Coverage   95.00%   95.00%           
=======================================
  Files         229      229           
  Lines       11668    11675    +7     
  Branches     3877     3876    -1     
=======================================
+ Hits        11085    11092    +7     
  Misses        251      251           
  Partials      332      332

Flag	Coverage Δ
eslint-plugin	`94.89% <100.00%> (?)`
typescript-eslint	`97.50% <ø> (?)`
unittest	`?`

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...nt-plugin/src/rules/switch-exhaustiveness-check.ts	`100.00% <100.00%> (ø)`

... and 1 file with indirect coverage changes

🚀 New features to boost your workflow:

❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
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… cases in stable order The rule listed missing cases in whatever order the compiler built the union in, which is neither the declared order nor a sorted one. For a union declared `10 | 2 | 1 | 100 | 20`, TypeScript hands back exactly that, so the report read `10 | 2 | 1 | 100 | 20` and the suggestion wrote its cases in the same jumble. The message and the suggestion could even disagree with each other. Every literal kind now has a place. Strings, numbers, and bigints sort by value, booleans put `false` first, and enum members and unique symbols sort by where they were declared. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011KSpN2n5ch3Fqro14mYEqG

…iteral sorting Reuses the existing `getValueOfLiteralType` util instead of hand-rolling the `ts.PseudoBigInt` conversion, and restores the declaration ordering the PR description promises for enum members and unique symbols: `Enum.Up | Enum.Down` rather than the alphabetical `Enum.Down | Enum.Up`. Only string, number, and bigint literals sort by value; every other kind keeps the order it was declared in, which also stops two enums in one union from interleaving. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

…by their enum Which of two enums the compiler resolves first depends on the other files in the lint run, so a union of two enums could report and fix in one order for a staged-files lint and another for a full one. Grouping the members by their enum's name pins that down while still leaving each enum's own members in declaration order.

…num case discriminating `Pending, Active, Done` numbered themselves 0, 1, 2, so declaration order happened to match both the numeric order and the alphabetical one and the test would have passed under any of the three. Numbering them out of order pins the declaration ordering down.

…by their printed type Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

…es directly Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

bradzacher

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You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.70.1](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8701-2026-09-21) ##### 🩹 Fixes - **eslint-plugin:** \[no-misused-promises] handle multiple Promise constituents ([#12904](typescript-eslint/typescript-eslint#12904)) - **eslint-plugin:** \[no-useless-default-assignment] convert the fixer to a suggestion fixer ([#12826](typescript-eslint/typescript-eslint#12826)) - **eslint-plugin:** \[no-unnecessary-condition] handle union-keyed index access on the left-hand side of nullish assignment ([#12747](typescript-eslint/typescript-eslint#12747)) - **eslint-plugin:** \[unbound-method] treat Intl.Collator.prototype.compare as spec-bound ([#12845](typescript-eslint/typescript-eslint#12845)) - **eslint-plugin:** \[no-unnecessary-parameter-property-assignment] account for parameter reassignment ([#12880](typescript-eslint/typescript-eslint#12880)) - **eslint-plugin:** \[await-thenable] prevent autofix from breaking code when removing `await` ([#12716](typescript-eslint/typescript-eslint#12716)) - **eslint-plugin:** \[no-meaningless-void-operator] allow void on assignment expressions ([#12873](typescript-eslint/typescript-eslint#12873)) - **eslint-plugin:** \[no-unnecessary-type-assertion] false positive for empty object asserted to a type alias of Record ([#12869](typescript-eslint/typescript-eslint#12869)) - **eslint-plugin:** \[no-misused-spread] omit WeakMap spread suggestions ([#12850](typescript-eslint/typescript-eslint#12850)) - **eslint-plugin:** \[no-generated-empty-object-type] don't report a mapped type whose keys are not resolved yet ([#12854](typescript-eslint/typescript-eslint#12854)) - **eslint-plugin:** \[no-explicit-any] use unknown\[] for bare any rest parameters ([#12818](typescript-eslint/typescript-eslint#12818)) - **eslint-plugin:** \[no-unnecessary-type-parameters] handle type precedence in the suggestion fixer ([#12637](typescript-eslint/typescript-eslint#12637)) - **eslint-plugin:** \[no-useless-default-assignment] avoid false positives on tuples with a rest element ([#12768](typescript-eslint/typescript-eslint#12768)) ##### ❤️ Thank You - Brad Zacher [@bradzacher](https://github.com/bradzacher) - Diptajoy Mistry [@diptomistry](https://github.com/diptomistry) - Grit [@Grit03](https://github.com/Grit03) - Hugo [@hugop95](https://github.com/hugop95) - Michael Naumov [@mnaoumov](https://github.com/mnaoumov) - Mikhail Baev [@baevm](https://github.com/baevm) - Om Rawat - Sanath [@sansynx](https://github.com/sansynx) - Shinji - Vinccool96 - 김채영 [@cchaeyoung](https://github.com/cchaeyoung) - 송재욱 See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.70.1) for more information. 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You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.70.1](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8701-2026-09-21) ##### 🩹 Fixes - **eslint-plugin:** \[no-misused-promises] handle multiple Promise constituents ([#12904](typescript-eslint/typescript-eslint#12904)) - **eslint-plugin:** \[no-useless-default-assignment] convert the fixer to a suggestion fixer ([#12826](typescript-eslint/typescript-eslint#12826)) - **eslint-plugin:** \[no-unnecessary-condition] handle union-keyed index access on the left-hand side of nullish assignment ([#12747](typescript-eslint/typescript-eslint#12747)) - **eslint-plugin:** \[unbound-method] treat Intl.Collator.prototype.compare as spec-bound ([#12845](typescript-eslint/typescript-eslint#12845)) - **eslint-plugin:** \[no-unnecessary-parameter-property-assignment] account for parameter reassignment ([#12880](typescript-eslint/typescript-eslint#12880)) - **eslint-plugin:** \[await-thenable] prevent autofix from breaking code when removing `await` ([#12716](typescript-eslint/typescript-eslint#12716)) - **eslint-plugin:** \[no-meaningless-void-operator] allow void on assignment expressions ([#12873](typescript-eslint/typescript-eslint#12873)) - **eslint-plugin:** \[no-unnecessary-type-assertion] false positive for empty object asserted to a type alias of Record ([#12869](typescript-eslint/typescript-eslint#12869)) - **eslint-plugin:** \[no-misused-spread] omit WeakMap spread suggestions ([#12850](typescript-eslint/typescript-eslint#12850)) - **eslint-plugin:** \[no-generated-empty-object-type] don't report a mapped type whose keys are not resolved yet ([#12854](typescript-eslint/typescript-eslint#12854)) - **eslint-plugin:** \[no-explicit-any] use unknown\[] for bare any rest parameters ([#12818](typescript-eslint/typescript-eslint#12818)) - **eslint-plugin:** \[no-unnecessary-type-parameters] handle type precedence in the suggestion fixer ([#12637](typescript-eslint/typescript-eslint#12637)) - **eslint-plugin:** \[no-useless-default-assignment] avoid false positives on tuples with a rest element ([#12768](typescript-eslint/typescript-eslint#12768)) ##### ❤️ Thank You - Brad Zacher [@bradzacher](https://github.com/bradzacher) - Diptajoy Mistry [@diptomistry](https://github.com/diptomistry) - Grit [@Grit03](https://github.com/Grit03) - Hugo [@hugop95](https://github.com/hugop95) - Michael Naumov [@mnaoumov](https://github.com/mnaoumov) - Mikhail Baev [@baevm](https://github.com/baevm) - Om Rawat - Sanath [@sansynx](https://github.com/sansynx) - Shinji - Vinccool96 - 김채영 [@cchaeyoung](https://github.com/cchaeyoung) - 송재욱 See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.70.1) for more information. 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| datasource | package | from | to | | ---------- | -------------------------------- | ------ | ------ | | npm | @typescript-eslint/eslint-plugin | 8.69.0 | 8.71.0 | | npm | @typescript-eslint/parser | 8.69.0 | 8.71.0 | ## [v8.71.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8710-2026-09-28) ##### 🚀 Features - **eslint-plugin:** \[no-unsafe-enum-assignment] add rule ([#12732](typescript-eslint/typescript-eslint#12732)) ##### 🩹 Fixes - **eslint-plugin:** \[no-misused-promises] handle a return outside of any function ([#12912](typescript-eslint/typescript-eslint#12912)) - **eslint-plugin:** \[no-unnecessary-type-assertion] specialize generic assertion report message ([#12832](typescript-eslint/typescript-eslint#12832)) - **eslint-plugin:** \[unbound-method] respect `this: void` on class properties ([7fce9127d](typescript-eslint/typescript-eslint@7fce9127d)) - **eslint-plugin:** \[switch-exhaustiveness-check] always sort literal cases in stable order ([#12885](typescript-eslint/typescript-eslint#12885)) ##### ❤️ Thank You - Evyatar Daud [@StyleShit](https://github.com/StyleShit) - Fatih Çakır [@wfatih](https://github.com/wfatih) - Josh Goldberg - Josh Goldberg ✨ - Zamiell [@Zamiell](https://github.com/Zamiell) See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.71.0) for more information. You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.70.1](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8701-2026-09-21) ##### 🩹 Fixes - **eslint-plugin:** \[no-misused-promises] handle multiple Promise constituents ([#12904](typescript-eslint/typescript-eslint#12904)) - **eslint-plugin:** \[no-useless-default-assignment] convert the fixer to a suggestion fixer ([#12826](typescript-eslint/typescript-eslint#12826)) - **eslint-plugin:** \[no-unnecessary-condition] handle union-keyed index access on the left-hand side of nullish assignment ([#12747](typescript-eslint/typescript-eslint#12747)) - **eslint-plugin:** \[unbound-method] treat Intl.Collator.prototype.compare as spec-bound ([#12845](typescript-eslint/typescript-eslint#12845)) - **eslint-plugin:** \[no-unnecessary-parameter-property-assignment] account for parameter reassignment ([#12880](typescript-eslint/typescript-eslint#12880)) - **eslint-plugin:** \[await-thenable] prevent autofix from breaking code when removing `await` ([#12716](typescript-eslint/typescript-eslint#12716)) - **eslint-plugin:** \[no-meaningless-void-operator] allow void on assignment expressions ([#12873](typescript-eslint/typescript-eslint#12873)) - **eslint-plugin:** \[no-unnecessary-type-assertion] false positive for empty object asserted to a type alias of Record ([#12869](typescript-eslint/typescript-eslint#12869)) - **eslint-plugin:** \[no-misused-spread] omit WeakMap spread suggestions ([#12850](typescript-eslint/typescript-eslint#12850)) - **eslint-plugin:** \[no-generated-empty-object-type] don't report a mapped type whose keys are not resolved yet ([#12854](typescript-eslint/typescript-eslint#12854)) - **eslint-plugin:** \[no-explicit-any] use unknown\[] for bare any rest parameters ([#12818](typescript-eslint/typescript-eslint#12818)) - **eslint-plugin:** \[no-unnecessary-type-parameters] handle type precedence in the suggestion fixer ([#12637](typescript-eslint/typescript-eslint#12637)) - **eslint-plugin:** \[no-useless-default-assignment] avoid false positives on tuples with a rest element ([#12768](typescript-eslint/typescript-eslint#12768)) ##### ❤️ Thank You - Brad Zacher [@bradzacher](https://github.com/bradzacher) - Diptajoy Mistry [@diptomistry](https://github.com/diptomistry) - Grit [@Grit03](https://github.com/Grit03) - Hugo [@hugop95](https://github.com/hugop95) - Michael Naumov [@mnaoumov](https://github.com/mnaoumov) - Mikhail Baev [@baevm](https://github.com/baevm) - Om Rawat - Sanath [@sansynx](https://github.com/sansynx) - Shinji - Vinccool96 - 김채영 [@cchaeyoung](https://github.com/cchaeyoung) - 송재욱 See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.70.1) for more information. 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| datasource | package | from | to | | ---------- | -------------------------------- | ------ | ------ | | npm | @typescript-eslint/eslint-plugin | 8.69.0 | 8.71.0 | | npm | @typescript-eslint/parser | 8.69.0 | 8.71.0 | ## [v8.71.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8710-2026-09-28) ##### 🚀 Features - **eslint-plugin:** \[no-unsafe-enum-assignment] add rule ([#12732](typescript-eslint/typescript-eslint#12732)) ##### 🩹 Fixes - **eslint-plugin:** \[no-misused-promises] handle a return outside of any function ([#12912](typescript-eslint/typescript-eslint#12912)) - **eslint-plugin:** \[no-unnecessary-type-assertion] specialize generic assertion report message ([#12832](typescript-eslint/typescript-eslint#12832)) - **eslint-plugin:** \[unbound-method] respect `this: void` on class properties ([7fce9127d](typescript-eslint/typescript-eslint@7fce9127d)) - **eslint-plugin:** \[switch-exhaustiveness-check] always sort literal cases in stable order ([#12885](typescript-eslint/typescript-eslint#12885)) ##### ❤️ Thank You - Evyatar Daud [@StyleShit](https://github.com/StyleShit) - Fatih Çakır [@wfatih](https://github.com/wfatih) - Josh Goldberg - Josh Goldberg ✨ - Zamiell [@Zamiell](https://github.com/Zamiell) See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.71.0) for more information. You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.70.1](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8701-2026-09-21) ##### 🩹 Fixes - **eslint-plugin:** \[no-misused-promises] handle multiple Promise constituents ([#12904](typescript-eslint/typescript-eslint#12904)) - **eslint-plugin:** \[no-useless-default-assignment] convert the fixer to a suggestion fixer ([#12826](typescript-eslint/typescript-eslint#12826)) - **eslint-plugin:** \[no-unnecessary-condition] handle union-keyed index access on the left-hand side of nullish assignment ([#12747](typescript-eslint/typescript-eslint#12747)) - **eslint-plugin:** \[unbound-method] treat Intl.Collator.prototype.compare as spec-bound ([#12845](typescript-eslint/typescript-eslint#12845)) - **eslint-plugin:** \[no-unnecessary-parameter-property-assignment] account for parameter reassignment ([#12880](typescript-eslint/typescript-eslint#12880)) - **eslint-plugin:** \[await-thenable] prevent autofix from breaking code when removing `await` ([#12716](typescript-eslint/typescript-eslint#12716)) - **eslint-plugin:** \[no-meaningless-void-operator] allow void on assignment expressions ([#12873](typescript-eslint/typescript-eslint#12873)) - **eslint-plugin:** \[no-unnecessary-type-assertion] false positive for empty object asserted to a type alias of Record ([#12869](typescript-eslint/typescript-eslint#12869)) - **eslint-plugin:** \[no-misused-spread] omit WeakMap spread suggestions ([#12850](typescript-eslint/typescript-eslint#12850)) - **eslint-plugin:** \[no-generated-empty-object-type] don't report a mapped type whose keys are not resolved yet ([#12854](typescript-eslint/typescript-eslint#12854)) - **eslint-plugin:** \[no-explicit-any] use unknown\[] for bare any rest parameters ([#12818](typescript-eslint/typescript-eslint#12818)) - **eslint-plugin:** \[no-unnecessary-type-parameters] handle type precedence in the suggestion fixer ([#12637](typescript-eslint/typescript-eslint#12637)) - **eslint-plugin:** \[no-useless-default-assignment] avoid false positives on tuples with a rest element ([#12768](typescript-eslint/typescript-eslint#12768)) ##### ❤️ Thank You - Brad Zacher [@bradzacher](https://github.com/bradzacher) - Diptajoy Mistry [@diptomistry](https://github.com/diptomistry) - Grit [@Grit03](https://github.com/Grit03) - Hugo [@hugop95](https://github.com/hugop95) - Michael Naumov [@mnaoumov](https://github.com/mnaoumov) - Mikhail Baev [@baevm](https://github.com/baevm) - Om Rawat - Sanath [@sansynx](https://github.com/sansynx) - Shinji - Vinccool96 - 김채영 [@cchaeyoung](https://github.com/cchaeyoung) - 송재욱 See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.70.1) for more information. You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.70.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8700-2026-09-07) ##### 🚀 Features - **eslint-plugin:** \[no-generated-empty-object-type] add rule ([#12730](typescript-eslint/typescript-eslint#12730)) ##### 🩹 Fixes - **eslint-plugin:** \[no-deprecated] report deprecated imported values used in object shorthand properties ([#12780](typescript-eslint/typescript-eslint#12780)) - **eslint-plugin:** \[no-unnecessary-condition] no false positive on RHS of a nested logical expression ([#12728](typescript-eslint/typescript-eslint#12728)) - **eslint-plugin:** \[member-ordering] don't report fields that read fields declared before them ([#12729](typescript-eslint/typescript-eslint#12729)) ##### ❤️ Thank You - Josh Goldberg ✨ [@JoshuaKGoldberg](https://github.com/JoshuaKGoldberg) - Ulrich Stark [@ulrichstark](https://github.com/ulrichstark) See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.70.0) for more information. You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website.

JoshuaKGoldberg mentioned this pull request Sep 15, 2026

test: enable stableTypeOrdering in RuleTester tests #12872

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JoshuaKGoldberg commented Sep 15, 2026

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JoshuaKGoldberg commented Sep 15, 2026

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JoshuaKGoldberg mentioned this pull request Sep 15, 2026

fix(eslint-plugin): [unbound-method] respect this: void on class properties #12886

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JoshuaKGoldberg changed the title ~~fix(eslint-plugin): sort literal cases in switch-exhaustiveness-check~~ fix(eslint-plugin): [switch-exhaustiveness-check] always sort literal cases in stable order Sep 15, 2026

JoshuaKGoldberg force-pushed the fix/switch-exhaustiveness-check-sort-literals branch 2 times, most recently from 79d5a12 to 6d0f687 Compare September 16, 2026 00:50

JoshuaKGoldberg force-pushed the fix/switch-exhaustiveness-check-sort-literals branch from 6d0f687 to 16d18bb Compare September 16, 2026 01:15

JoshuaKGoldberg force-pushed the fix/switch-exhaustiveness-check-sort-literals branch from 16d18bb to d3c82bf Compare September 16, 2026 01:27

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JoshuaKGoldberg commented Sep 19, 2026

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JoshuaKGoldberg commented Sep 19, 2026

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JoshuaKGoldberg and others added 5 commits September 18, 2026 22:28

fix(eslint-plugin): [switch-exhaustiveness-check] sort missing cases …

716ef48

…by their printed type Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

fix(eslint-plugin): [switch-exhaustiveness-check] compare printed typ…

6b7d634

…es directly Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

JoshuaKGoldberg marked this pull request as ready for review September 19, 2026 16:23

StyleShit reviewed Sep 20, 2026

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JoshuaKGoldberg requested a review from StyleShit September 20, 2026 15:32

StyleShit approved these changes Sep 22, 2026

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github-actions Bot added the 1 approval >=1 team member has approved this PR; we're now leaving it open for more reviews before we merge label Sep 22, 2026

bradzacher approved these changes Sep 22, 2026

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bradzacher merged commit ce70016 into main Sep 22, 2026
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bradzacher deleted the fix/switch-exhaustiveness-check-sort-literals branch September 22, 2026 07:11

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fix(eslint-plugin): [switch-exhaustiveness-check] always sort literal cases in stable order - #12885

fix(eslint-plugin): [switch-exhaustiveness-check] always sort literal cases in stable order#12885
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