Update node types.isMap tests

microsoft/TypeScript#49625 improves handling of
unions in type predicates so that unions are correctly preserved. This
breaks types.isMap in node.

For now I just changed the tests' expected type, but the type of isMap doesn't
make much sense to me. It should probably be changed, but that's a much
more complex task.

This break is tracked at
microsoft/TypeScript#49988 although it's
correct, I think,  so not very likely to be reverted.

Author: sandersn

types/node/test/util_types.ts

@@ -60,7 +60,7 @@ if (types.isMap(object)) {
     object; // $ExpectType Map<unknown, unknown>
 
     if (types.isMap(readonlyMapOrRecord)) {
-        readonlyMapOrRecord; // $ExpectType ReadonlyMap<any, any>
+        readonlyMapOrRecord; // $ExpectType ReadonlyMap<any, any> || ReadonlyMap<any, any> | Map<unknown, unknown>
     }
 }
 if (types.isNativeError(object)) {

types/node/v14/test/util.ts

@@ -257,7 +257,7 @@ function testUtilTypes(
         object; // $ExpectType Map<any, any>
 
         if (util.types.isMap(readonlyMapOrRecord)) {
-            readonlyMapOrRecord; // $ExpectType ReadonlyMap<any, any>
+            readonlyMapOrRecord; // $ExpectType ReadonlyMap<any, any> || Map<any, any> | ReadonlyMap<any, any>
         }
     }
     if (util.types.isNativeError(object)) {

types/node/v16/test/util_types.ts

@@ -56,11 +56,12 @@ if (types.isInt16Array(object)) {
 if (types.isInt32Array(object)) {
     object; // $ExpectType Int32Array
 }
+
 if (types.isMap(object)) {
     object; // $ExpectType Map<unknown, unknown>
 
     if (types.isMap(readonlyMapOrRecord)) {
-        readonlyMapOrRecord; // $ExpectType ReadonlyMap<any, any>
+        readonlyMapOrRecord; // $ExpectType ReadonlyMap<any, any> || ReadonlyMap<any, any> | Map<unknown, unknown>
     }
 }
 if (types.isNativeError(object)) {