Revert "Revert #37106 (#38172)"

This reverts commit 84c83da.

Author: DanielRosenwasser

src/compiler/checker.ts

@@ -20555,7 +20555,7 @@ namespace ts {
             }
 
             function narrowByInKeyword(type: Type, literal: LiteralExpression, assumeTrue: boolean) {
-                if (type.flags & (TypeFlags.Union | TypeFlags.Object) || isThisTypeParameter(type)) {
+                if (type.flags & (TypeFlags.Union | TypeFlags.Object | TypeFlags.Intersection) || isThisTypeParameter(type)) {
                     const propName = escapeLeadingUnderscores(literal.text);
                     return filterType(type, t => isTypePresencePossible(t, propName, assumeTrue));
                 }

tests/baselines/reference/inKeywordTypeguard.errors.txt

@@ -19,10 +19,9 @@ tests/cases/compiler/inKeywordTypeguard.ts(74,32): error TS2339: Property 'a' do
 tests/cases/compiler/inKeywordTypeguard.ts(82,39): error TS2339: Property 'b' does not exist on type 'A'.
 tests/cases/compiler/inKeywordTypeguard.ts(84,39): error TS2339: Property 'a' does not exist on type 'B'.
 tests/cases/compiler/inKeywordTypeguard.ts(94,26): error TS2339: Property 'a' does not exist on type 'never'.
-tests/cases/compiler/inKeywordTypeguard.ts(103,13): error TS2322: Type '{ a: string; } & { b: string; }' is not assignable to type 'never'.
 
 
-==== tests/cases/compiler/inKeywordTypeguard.ts (18 errors) ====
+==== tests/cases/compiler/inKeywordTypeguard.ts (17 errors) ====
     class A { a: string; }
     class B { b: string; }
 
@@ -164,8 +163,6 @@ tests/cases/compiler/inKeywordTypeguard.ts(103,13): error TS2322: Type '{ a: str
             let s: string = x.a;
         } else {
             let n: never = x;
-                ~
-!!! error TS2322: Type '{ a: string; } & { b: string; }' is not assignable to type 'never'.
         }
     }
 

tests/baselines/reference/inKeywordTypeguard.types

@@ -318,7 +318,7 @@ function positiveIntersectionTest(x: { a: string } & { b: string }) {
     } else {
         let n: never = x;
 >n : never
->x : { a: string; } & { b: string; }
+>x : never
     }
 }