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RangeError: Maximum call stack size exceeded at getAwaitedTypeNoAliasย #49723
Description
Bug Report
Moved from #47208 (comment)
๐ Search Terms
RangeError Maximum call stack size exceeded getAwaitedTypeNoAlias
๐ Version & Regression Information
- This is the behavior in every version I tried.
โฏ Playground Link
๐ป Code
type T = 1 | Promise<T> | T[];
export async function myFunction(param: T) {
const awaited = await param
}๐ Actual behavior
RangeError: Maximum call stack size exceeded
at getAwaitedTypeNoAlias (src\compiler\checker.ts:36632:70)
at mapper (src\compiler\checker.ts:36628:71)
at mapType (src\compiler\checker.ts:23959:95)
at getAwaitedTypeNoAlias (src\compiler\checker.ts:36629:60)
at getAwaitedTypeNoAlias (src\compiler\checker.ts:36678:37)
at mapper (src\compiler\checker.ts:36628:71)
at mapType (src\compiler\checker.ts:23959:95)
at getAwaitedTypeNoAlias (src\compiler\checker.ts:36629:60)
at getAwaitedTypeNoAlias (src\compiler\checker.ts:36678:37)
at mapper (src\compiler\checker.ts:36628:71)
at mapType (src\compiler\checker.ts:23959:95)
at getAwaitedTypeNoAlias (src\compiler\checker.ts:36629:60)
at getAwaitedTypeNoAlias (src\compiler\checker.ts:36678:37)
at mapper (src\compiler\checker.ts:36628:71)
at mapType (src\compiler\checker.ts:23959:95)
at getAwaitedTypeNoAlias (src\compiler\checker.ts:36629:60)
at getAwaitedTypeNoAlias (src\compiler\checker.ts:36678:37)
๐ Expected behavior
No crash.
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jakebailey commentedon Jun 29, 2022
Actually, this is a dupe of #49646 and should be fixed by #49677.
fatcerberus commentedon Jun 29, 2022
I'm not sure how to read this type. Does this mean
Tis either:11s1s11s1s1s...or is it just a completely circular definition?
jakebailey commentedon Jun 29, 2022
It's just circular; there's an error message for types like these that can't be resolved (see the linked PR).
fatcerberus commentedon Jun 29, 2022
That's what I thought; I guess I'm just confused because I thought when TS produced an error for a circular type it subsequently treated the type as
any, which should be enough to prevent the crash onawait... I guess the bug is that this case isn't being detected as circularAndarist commentedon Jun 29, 2022
Yep, notice how I've fixed this by just adding the circularity tracking~ here:
https://github.com/microsoft/TypeScript/pull/49677/files#diff-d9ab6589e714c71e657f601cf30ff51dfc607fc98419bf72e04f6b0fa92cc4b8R36628
Add test from microsoft#49723