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Regression Crash: RangeError: Maximum call stack size exceeded in isThisInTypeQuery on Nightly #63015
Description
🔎 Search Terms
RangeError: Maximum call stack size exceeded
isThisInTypeQuery
Regression
typeof crash
🕗 Version & Regression Information
Works in: v5.7.3, v5.8.3, v5.9.3 (Reports standard errors: TS2448, TS2345, etc.)
Crashes in: Nightly
⏯ Playground Link
💻 Code
unionOfDifferentReturnType1(true); // error in type of parameter
const unionOfDifferentReturnType1: {
(a: any): number;
} | {
(a: number): typeof Date;
};🙁 Actual behavior
.\ts-versions\nightly\node_modules\.bin\tsc.cmd .\unionTypeCallSignatures_6.ts
D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:123178
throw e;
^
RangeError: Maximum call stack size exceeded
at isThisIdentifier (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:16646:26)
at isThisInTypeQuery (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:16656:8)
at checkIdentifier (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:71968:9)
at checkExpressionWorker (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:80857:16)
at checkExpression (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:80800:32)
at checkExpressionWithTypeArguments (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:77806:182)
at getTypeFromTypeQueryNode (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:60457:20)
at getTypeFromTypeNodeWorker (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:63099:16)
at getTypeFromTypeNode (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:63055:41)
at getReturnTypeFromAnnotation (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:59715:14)
Node.js v22.19.0
🙂 Expected behavior
The compiler should not crash.
Additional information about the issue
No response
Activity
Andarist commentedon Jan 20, 2026
This is a fallout of https://github.com/microsoft/TypeScript/pull/62243/files#r2264931395 . I'm investigating this and I'll put up a PR with a fix soon
RyanCavanaugh commentedon Jan 20, 2026
🤖 Thank you for your issue! I've done some analysis to help get you started. This response is automatically generated; feel free to 👍 or 👎 this comment according to its usefulness.
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