Before You File a Bug Report Please Confirm You Have Done The Following...

• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.
• I have searched for related issues and found none that matched my issue.
• I have read the FAQ and my problem is not listed.

Relevant Package

ast-spec

Playground Link

https://typescript-eslint.io/play/#ts=5.8.3&showAST=es&fileType=.ts&code=G4QwTgBCBcEN4QNoGsIEsB2UME8C6sIuEAvgFBmiQBGsCK6WR%2BA-IceZeBAMZ0RgApiAAmAewwAbHElSZs%2BdjM5UII-gGohoidNmMFeNgtIVVg-gFpt4qTIbzmBEySA&eslintrc=N4KABGBEBOCuA2BTAzpAXGYBfEWg&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA&tokens=true

Repro Code

var a: { [k in any]: any }

var b: { [k in any]?: any }

var c: { readonly [k in any]: any }

var d: { +readonly [k in any]?: any }

var e: { -readonly [k in any]: any }

ESLint Config

tsconfig

Expected Result

The 1st TSMappedType should have properties { optional: false, readonly: undefined }

The 2nd TSMappedType should have property { readonly: undefined }

The 3rd TSMappedType should have property { optional: false }

The 5th TSMappedType should have property { optional: false }

Actual Result

The aforementioned TSMappedTypes are missing such properties, resulted to inconsistent AST shapes.

Additional Info

No response

Versions