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fix(visitor-keys): fix visitor keys order#11279

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bradzacher merged 1 commit intotypescript-eslint:mainfrom
overlookmotel:fix-visitor-keys-order
Jun 7, 2025
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fix(visitor-keys): fix visitor keys order#11279
bradzacher merged 1 commit intotypescript-eslint:mainfrom
overlookmotel:fix-visitor-keys-order

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@overlookmotel overlookmotel commented Jun 6, 2025 •
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PR Checklist

Overview

As discussed in #11276, visitor keys are not in source code order for 5 types:

  • TSImportType
  • TSIndexedAccessType
  • TSMethodSignature
  • TSPropertySignature
  • TSTypePredicate

This PR fixes that by altering the order of keys in AdditionalKeys.

The changes to test snapshots are incidental details.

It appears that visitation happening in source code order is not covered by tests, but no lint rules are impacted by this change. If required, I would be happy to add tests, if someone can point me to where to put them.

FYI: Oxc's JS-side AST for TS files now aligns exactly with TS-ESLint parser's. The discrepancies in visitation order addressed in this PR were discovered during the work on alignment to get there. Our conformance testing ensures that visitor keys (after the changes in this PR) result in visitation in source code order for all AST types, for all Test262 and TypeScript test cases.

Except... ExportSpecifier where local and exported are visited in wrong order. However, TS-ESLint inherits that problem from eslint-visitor-keys. eslint/js#655 hopes to address that one upstream.

Anyway, my point is: I imagine it'd be preferable for TS-ESLint to have your own test coverage for visitation order. However, if you choose to believe me, I can tell you that the types changed in this PR + ExportSpecifier are the only places where there is a problem.

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codecov bot commented Jun 6, 2025 •
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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.91%. Comparing base (0f5c59c) to head (b5f8186).
Report is 2 commits behind head on main.

Additional details and impacted files 
@@           Coverage Diff           @@
##             main   #11279   +/-   ##
=======================================
  Coverage   90.91%   90.91%           
=======================================
  Files         501      501           
  Lines       50869    50869           
  Branches     8382     8382           
=======================================
  Hits        46248    46248           
  Misses       4606     4606           
  Partials       15       15
Flag Coverage Δ
unittest 90.91% <100.00%> (ø)

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

Files with missing lines Coverage Δ
packages/visitor-keys/src/visitor-keys.ts 100.00% <100.00%> (ø)
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kirkwaiblinger
kirkwaiblinger approved these changes Jun 6, 2025
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Thanks for sending this!

RE the test coverage - I think let's get this merged and I'd invite you to file a followup issue for the test coverage question.

@kirkwaiblinger kirkwaiblinger added the 1 approval >=1 team member has approved this PR; we're now leaving it open for more reviews before we merge label Jun 6, 2025
bradzacher
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lgtm15.jpg

@bradzacher bradzacher merged commit 1e0ba62 into typescript-eslint:main Jun 7, 2025
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@overlookmotel overlookmotel deleted the fix-visitor-keys-order branch June 7, 2025 09:47
@overlookmotel overlookmotel mentioned this pull request Jun 7, 2025
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overlookmotel commented Jun 7, 2025

I'd invite you to file a followup issue for the test coverage question.

#11282

This was referenced Jun 10, 2025
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@bradzacher bradzacher bradzacher approved these changes

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Bug: Visitor keys for 5 types are not in source order

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