Improve relationship check for mapped type sources under exactOptionalPropertyTypes
#60890
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Andarist
commented
Dec 31, 2024
| @@ -12337,7 +12337,24 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker { | |||
| } | |||
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| function getNonMissingTypeOfSymbol(symbol: Symbol) { | |||
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This is used by isPropertySymbolTypeRelated, the problem is that - at times - the instantiated mapped symbol is still deferred~ and is an indexed access type. When that happens, this function can't remove the missing type because it's not yet there.
To accommodate that, I clone the indexed access types resulting from that mapped symbol intantiation with a new AccessFlags.NonMissing so when the constraint of that indexed access gets finally requested the missing type can still be removed from it, like this code here intended to.
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fixes #60233