Fix JSType equality bug leading to bad type errors with native module checks.

This is a partial fix for b/140763807. The underlying issue is that while the typed universe is still being created, before a type is ultimately marked "resolved", nominal types are compared solely based on name. The Closure type system allows unique types in different scopes to share a name, though.

This fixes that bug for the specific case of one or both names being in a different goog.module. It's not a general fix, but should be enough to prevent this bug from blocking native module typechecking for goog.module.

PiperOrigin-RevId: 705118303

Author: lauraharker

src/com/google/javascript/rhino/jstype/EqualityChecker.java

@@ -235,7 +235,10 @@ private boolean areEqualInternal(JSType left, JSType right) {
         // TODO(b/140763807): this is not valid across scopes pre-resolution.
         String nameOfleft = checkNotNull(leftUnwrapped.getReferenceName());
         String nameOfright = checkNotNull(rightUnwrapped.getReferenceName());
-        return Objects.equals(nameOfleft, nameOfright);
+        String googModuleIdOfLeft = getGoogModuleId(leftUnwrapped);
+        String googModuleIdOfRight = getGoogModuleId(rightUnwrapped);
+        return Objects.equals(nameOfleft, nameOfright)
+            && Objects.equals(googModuleIdOfLeft, googModuleIdOfRight);
       }
     }
 
@@ -286,6 +289,16 @@ private boolean areUnionEqual(UnionType left, UnionType right) {
     return true;
   }
 
+  private static @Nullable String getGoogModuleId(ObjectType type) {
+    if (type instanceof FunctionType) {
+      return ((FunctionType) type).getGoogModuleId();
+    }
+    if (type.getConstructor() != null) {
+      return type.getConstructor().getGoogModuleId();
+    }
+    return null;
+  }
+
   /**
    * Two function types are equal if their signatures match. Since they don't have signatures, two
    * interfaces are equal if their names match.

test/com/google/javascript/rhino/jstype/JSTypeTest.java

@@ -6437,6 +6437,47 @@ public void testEqualityOfClassTypes_withSameReferenceName_preResolution() {
     }
   }
 
+  @Test
+  public void testEqualityOfClassTypes_withSameReferenceName_differentGoogModuleId_preResolution() {
+    try (JSTypeResolver.Closer closer = registry.getResolver().openForDefinition()) {
+      FunctionType classACtor =
+          FunctionType.builder(registry)
+              .forConstructor()
+              .withName("Foo")
+              .setGoogModuleId("module1")
+              .build();
+
+      FunctionType classBCtor =
+          FunctionType.builder(registry).forConstructor().withName("Foo").build();
+
+      // the different goog module id indicate the types are not equal.
+      assertType(classACtor.getInstanceType()).isNotEqualTo(classBCtor.getInstanceType());
+    }
+  }
+
+  @Test
+  public void testEqualityOfClassTypes_withSameReferenceName_sameGoogModuleId_preResolution() {
+    try (JSTypeResolver.Closer closer = registry.getResolver().openForDefinition()) {
+      FunctionType classACtor =
+          FunctionType.builder(registry)
+              .forConstructor()
+              .withName("Foo")
+              .setGoogModuleId("module1")
+              .build();
+
+      FunctionType classBCtor =
+          FunctionType.builder(registry)
+              .forConstructor()
+              .withName("Foo")
+              .setGoogModuleId("module1")
+              .build();
+
+      // Currently, to handle NamedTypes, we treat unresolved type equality as purely based on
+      // reference name & goog module id.
+      assertType(classACtor.getInstanceType()).isEqualTo(classBCtor.getInstanceType());
+    }
+  }
+
   @Test
   public void testEqualityOfClassTypes_withSameReferenceName_postResolution() {
     FunctionType classACtor =