Fix check in isMappedTypeGenericIndexedAccess

ahejlsberg · ahejlsberg · commit d347d8778223 · 2022-06-01T09:38:32.000-07:00
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
@@ -12308,7 +12308,7 @@ namespace ts {
             let objectType;
             return !!(type.flags & TypeFlags.IndexedAccess && getObjectFlags(objectType = (type as IndexedAccessType).objectType) & ObjectFlags.Mapped &&
                 !isGenericMappedType(objectType) && isGenericIndexType((type as IndexedAccessType).indexType) &&
-                !(objectType as MappedType).declaration.questionToken && !(objectType as MappedType).declaration.nameType);
+                !(getMappedTypeModifiers(objectType as MappedType) & MappedTypeModifiers.ExcludeOptional) && !(objectType as MappedType).declaration.nameType);
         }
 
         /**

Original file line number	Diff line number	Diff line change
`@@ -12308,7 +12308,7 @@ namespace ts {`
`12308`	`12308`	`let objectType;`
`12309`	`12309`	`return !!(type.flags & TypeFlags.IndexedAccess && getObjectFlags(objectType = (type as IndexedAccessType).objectType) & ObjectFlags.Mapped &&`
`12310`	`12310`	`!isGenericMappedType(objectType) && isGenericIndexType((type as IndexedAccessType).indexType) &&`
`12311`		`- !(objectType as MappedType).declaration.questionToken && !(objectType as MappedType).declaration.nameType);`
	`12311`	`+ !(getMappedTypeModifiers(objectType as MappedType) & MappedTypeModifiers.ExcludeOptional) && !(objectType as MappedType).declaration.nameType);`
`12312`	`12312`	`}`
`12313`	`12313`
`12314`	`12314`	`/**`