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Ensure we don't overwrite computed CouldContainTypeVariables in new optimization (#54507)

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Jake Bailey 2023-06-05 15:31:19 -07:00 committed by GitHub
parent 160d1b7d0a
commit e3c5209ae2
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1 changed files with 6 additions and 2 deletions
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8
src/compiler/checker.ts
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@ -18801,8 +18801,12 @@ 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);
}