fix(eslint-plugin): [consistent-indexed-object-style] skip fixer if interface is a default export

[camc314]

PR Checklist

• Addresses an existing open issue: fixes #000
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

checkout the playground: https://typescript-eslint.io/play#ts=5.9.2&fileType=.tsx&code=FAUwHgDg9gTgLgAgCYgGYEMCuAbRBLAOzhBgwGMQEBlMgCxCRxKpIDc8KEBvYBPhANoBrEAE8AXAgDOcGIQDmAXUmYCQglADuBANzAAvkA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6MgeyeUuX0Ra1mAE0QAPRMNocARgCtEZOn0JJ0URNGgdokcGAC%2BIA0A&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA&tokens=false

export default interface SchedulerService {
    [key: string]: unknown;
}

has a quick fix to:

export default type SchedulerService = Record<string, unknown>;

But this creates invalid source code, as you cannot have export default type

Refs: oxc-project/oxc#17866

Note: I used AI for this PR, but I've reviewed the code it's written and I take responsibility for it's correcness and it's quality

[typescript-eslint]

Thanks for the PR, @camc314!

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]

View your CI Pipeline Execution ↗ for commit 84c382f

Command	Status	Duration	Result
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nx run-many -t typecheck	✅ Succeeded	2m 3s	View ↗
nx test typescript-estree --coverage=false	✅ Succeeded	2s	View ↗
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---

☁️ Nx Cloud last updated this comment at 2026-01-11 13:55:16 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.73%. Comparing base (dd90da8) to head (84c382f).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11951   +/-   ##
=======================================
  Coverage   90.72%   90.73%           
=======================================
  Files         527      527           
  Lines       53678    53679    +1     
  Branches     9026     9027    +1     
=======================================
+ Hits        48702    48703    +1     
  Misses       4963     4963           
  Partials       13       13           

Flag	Coverage Δ
unittest	90.73% <100.00%> (+<0.01%)	⬆️

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

Files with missing lines	Coverage Δ
...lugin/src/rules/consistent-indexed-object-style.ts	99.32% <100.00%> (+<0.01%)	⬆️

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[JoshuaKGoldberg]

Thanks!

It's odd to me that export default type isn't allowed. 🤷