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Merge pull request #28718 from Microsoft/fixDefinitelyAssignableRelation

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Fix definitely assignable relation
This commit is contained in:
Anders Hejlsberg
2018-11-28 17:38:51 -08:00
committed by GitHub
parent 9319ea4941 ff456ab171
commit 36dc04b982
6 changed files with 97 additions and 1 deletions
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3
src/compiler/checker.ts
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@@ -12259,7 +12259,8 @@ namespace ts {
else if (target.flags & TypeFlags.IndexedAccess) {
// A type S is related to a type T[K], where T and K aren't both type variables, if S is related to C,
// where C is the base constraint of T[K]
if (relation !== identityRelation && !(isGenericObjectType((<IndexedAccessType>target).objectType) && isGenericIndexType((<IndexedAccessType>target).indexType))) {
if (relation !== identityRelation && relation !== definitelyAssignableRelation &&
!(isGenericObjectType((<IndexedAccessType>target).objectType) && isGenericIndexType((<IndexedAccessType>target).indexType))) {
const constraint = getBaseConstraintOfType(target);
if (constraint && constraint !== target) {
if (result = isRelatedTo(source, constraint, reportErrors)) {