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🤖 Pick PR #54507 (Ensure we don't overwrite computed ...) into release-5.1 #54545

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Merged
merged 1 commit into from
Jun 7, 2023
Merged

🤖 Pick PR #54507 (Ensure we don't overwrite computed ...) into release-5.1 #54545

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8 changes: 6 additions & 2 deletions src/compiler/checker.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -18768,8 +18768,12 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
// If none of the type arguments for the outer type parameters contain type variables, it follows
// that the instantiated type doesn't reference type variables.
if (result.flags & TypeFlags.ObjectFlagsType && !((result as ObjectFlagsType).objectFlags & ObjectFlags.CouldContainTypeVariablesComputed)) {
(result as ObjectFlagsType).objectFlags |= ObjectFlags.CouldContainTypeVariablesComputed |
(some(typeArguments, couldContainTypeVariables) ? ObjectFlags.CouldContainTypeVariables : 0);
const resultCouldContainTypeVariables = some(typeArguments, couldContainTypeVariables);
// The above check may have caused the result's objectFlags to update if the result is referenced via typeArguments.
if (!((result as ObjectFlagsType).objectFlags & ObjectFlags.CouldContainTypeVariablesComputed)) {
(result as ObjectFlagsType).objectFlags |= ObjectFlags.CouldContainTypeVariablesComputed |
(resultCouldContainTypeVariables ? ObjectFlags.CouldContainTypeVariables : 0);
}
}
target.instantiations.set(id, result);
}
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