fix nits

CHANGELOG.md

@@ -9,7 +9,7 @@
 * Require dart_style >= 2.3.7, so that the current Dart language version can be
   passed to `DartFormatter`.
 * Add topics to `pubspec.yaml`.
-* Fix a bug where typedef-aliases in type arguments were not correctly
+* Fix a bug where type aliases in type arguments were not correctly
   resolved.
 * Fix a bug where record types were not correctly resolved.
 

lib/src/builder.dart

@@ -180,10 +180,14 @@ $rawOutput
         return;
       }
       seenTypes.add(type);
-      librariesWithTypes.addAll([
-        if (type.element?.library != null) type.element!.library!,
-        if (type.alias?.element.library != null) type.alias!.element.library,
-      ]);
+
+      if (type.element?.library case var library?) {
+        librariesWithTypes.add(library);
+      }
+      if (type.alias?.element.library case var library?) {
+        librariesWithTypes.add(library);
+      }
+
       type.element?.accept(typeVisitor);
       type.alias?.element.accept(typeVisitor);
       switch (type) {

test/builder/auto_mocks_test.dart

@@ -3583,8 +3583,7 @@ void main() {
         expect(mocksContent, contains('implements _i2.Baz'));
       });
 
-      test('when its a type parameter of function which returns another type',
-          () async {
+      test('when it\'s a function which returns any type', () async {
         final mocksContent = await buildWithNonNullable({
           ...annotationsAsset,
           'foo|lib/foo.dart': dedent(r'''
@@ -3612,14 +3611,15 @@ void main() {
         expect(mocksContent, contains('class MockFoo extends _i1.Mock'));
         expect(mocksContent, contains('implements _i2.Foo'));
       });
-      test('when its a duplicate type parameter', () async {
+      test('when the underlying type is identical to another type alias',
+          () async {
         final mocksContent = await buildWithNonNullable({
           ...annotationsAsset,
           'foo|lib/foo.dart': dedent(r'''
             class Bar {}
             typedef BarDef = int Function();
             typedef BarDef2 = int Function();
-            class BaseFoo<T,P> {
+            class BaseFoo<T, P> {
               BaseFoo(this.t1, this.t2);
               final T t1;
               final P t2;
@@ -3707,7 +3707,7 @@ void main() {
               contains('returnValue: _i3.Future<(int, {_i2.Bar bar})>.value('),
               contains('bar: _FakeBar_0('))));
     });
-    test('are supported as typedefs', () async {
+    test('are supported as type arguments', () async {
       final mocksContent = await buildWithNonNullable({
         ...annotationsAsset,
         'foo|lib/foo.dart': dedent(r'''
@@ -3731,7 +3731,7 @@ void main() {
       expect(mocksContent, contains('class MockFoo extends _i1.Mock'));
       expect(mocksContent, contains('implements _i2.Foo'));
     });
-    test('are supported as nested typedefs', () async {
+    test('are supported as nested type arguments', () async {
       final mocksContent = await buildWithNonNullable({
         ...annotationsAsset,
         'foo|lib/foo.dart': dedent(r'''