Only normalize intersections that include {}

ahejlsberg · ahejlsberg · commit 7bd2a6eeb73d · 2022-08-30T07:41:04.000-07:00
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
@@ -18493,7 +18493,7 @@ namespace ts {
             if (reduced !== type) {
                 return reduced;
             }
-            if (type.flags & TypeFlags.Intersection) {
+            if (type.flags & TypeFlags.Intersection && some((type as IntersectionType).types, isEmptyAnonymousObjectType)) {
                 const normalizedTypes = sameMap(type.types, t => getNormalizedType(t, writing));
                 if (normalizedTypes !== type.types) {
                     return getIntersectionType(normalizedTypes);

Original file line number	Diff line number	Diff line change
`@@ -18493,7 +18493,7 @@ namespace ts {`
`18493`	`18493`	`if (reduced !== type) {`
`18494`	`18494`	`return reduced;`
`18495`	`18495`	`}`
`18496`		`- if (type.flags & TypeFlags.Intersection) {`
	`18496`	`+ if (type.flags & TypeFlags.Intersection && some((type as IntersectionType).types, isEmptyAnonymousObjectType)) {`
`18497`	`18497`	`const normalizedTypes = sameMap(type.types, t => getNormalizedType(t, writing));`
`18498`	`18498`	`if (normalizedTypes !== type.types) {`
`18499`	`18499`	`return getIntersectionType(normalizedTypes);`