Microsoft/TypeScript
Crash: RangeError: Maximum call stack size exceeded in addTypesToUnion when using incomplete keyof type annotation on object destructuring
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#62,993 opened on 2026/01/16
BugDomain: CrashesHelp Wanted
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説明
🔎 Search Terms
addTypesToUnion stack overflow
getUnionTypeWorker crash
keyof missing type crash
Internal Compiler Error destructuring
🕗 Version & Regression Information
v5.7.3 / v5.8.3 / v5.9.3 / Nightly: Crashes（This crash only occurs when the --strict flag is enabled.）
⏯ Playground Link
💻 Code
const { c, d, e, f, g }: keyof = {
...{
...{
...{
c: 0,
},
d: 0
},
e: 0
},
f
};
🙁 Actual behavior
.\ts-versions\nightly\node_modules\.bin\tsc.cmd --strict .\mutated\destructuringSpread_mutated_batch15.ts
D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:123166
throw e;
^
RangeError: Maximum call stack size exceeded
at addTypesToUnion (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:61209:27)
at getUnionTypeWorker (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:61385:22)
at getUnionType (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:61381:12)
at mapType (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:69885:37)
at getApparentTypeOfContextualType (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:73263:28)
at checkObjectLiteral (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:73978:28)
at checkExpressionWorker (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:80883:16)
at checkExpression (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:80794:32)
at checkObjectLiteral (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:74062:37)
at checkExpressionWorker (D:\do\typeFuzz\ts-versions\nightly\node_modules\typescript\lib\_tsc.js:80883:16)
Node.js v22.19.0
🙂 Expected behavior
The compiler should report a syntax error and not crash.
Additional information about the issue
No response