Use the library effective language version when formatting

Author: srawlins

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## 5.4.6
 
-* Pass actual language version of generating package to formatter.
+* When formatting a generated mocks library, use the language version of the
+  library with the mockito annotation.
 
 ## 5.4.5
 
@@ -25,9 +26,9 @@
 
 ## 5.4.3
 
-* Require analyzer 5.12.0, allow analyzer version 6.x;
+* Require analyzer 5.12.0, allow analyzer version 6.x.
 * Add example of writing a class to mock function objects.
-* Add support for the `build_extensions` build.yaml option
+* Add support for the `build_extensions` build.yaml option.
 * Require Dart >=3.1.0.
 * **Potentially breaking** Changed default `String` value returned by nice
   mocks' unstubbed method to include some useful info. This could break the

lib/src/builder.dart

@@ -44,9 +44,7 @@ import 'package:collection/collection.dart';
 import 'package:dart_style/dart_style.dart';
 import 'package:mockito/annotations.dart';
 import 'package:mockito/src/version.dart';
-import 'package:package_config/package_config_types.dart';
 import 'package:path/path.dart' as p;
-import 'package:pub_semver/pub_semver.dart';
 import 'package:source_gen/source_gen.dart';
 
 /// For a source Dart library, generate the mocks referenced therein.
@@ -144,16 +142,9 @@ class MockBuilder implements Builder {
         useNullSafetySyntax: sourceLibIsNonNullable);
     final rawOutput = mockLibrary.accept(emitter).toString();
 
-    final packageConfig = await buildStep.packageConfig;
-    var surroundingLanguageVersion = DartFormatter.latestLanguageVersion;
-    if (packageConfig[mockLibraryAsset.package]
-        case Package(:final languageVersion?)) {
-      surroundingLanguageVersion =
-          Version(languageVersion.major, languageVersion.minor, 0);
-    }
-
     final mockLibraryContent =
-        DartFormatter(languageVersion: surroundingLanguageVersion).format('''
+        DartFormatter(languageVersion: entryLib.languageVersion.effective)
+            .format('''
 // Mocks generated by Mockito $packageVersion from annotations
 // in ${entryLib.definingCompilationUnit.source.uri.path}.
 // Do not manually edit this file.

pubspec.yaml

@@ -20,9 +20,7 @@ dependencies:
   dart_style: '>=2.3.7 <4.0.0'
   matcher: ^0.12.16
   meta: ^1.15.0
-  package_config: ^2.1.1
   path: ^1.9.0
-  pub_semver: ^2.1.5
   source_gen: ">=1.4.0 <3.0.0"
   test_api: ">=0.6.1 <0.8.0"
 
@@ -32,4 +30,5 @@ dev_dependencies:
   build_web_compilers: ^4.0.11
   http: ^1.0.0
   lints: ^5.1.0
+  package_config: ^2.1.1
   test: ^1.24.4