Support YAML list format for analysis_options includes, and update tests accordingly

lib/src/dependency_validator.dart

@@ -199,7 +199,8 @@ Future<bool> checkPackage({required String root}) async {
   final packagesUsedOutsidePublicDirs = <String>{
     // For more info on analysis options:
     // https://dart.dev/guides/language/analysis-options#the-analysis-options-file
-    if (optionsIncludePackage != null) optionsIncludePackage,
+    if (optionsIncludePackage != null && optionsIncludePackage.isNotEmpty)
+      ...optionsIncludePackage,
   };
   for (final file in nonPublicDartFiles) {
     packagesUsedOutsidePublicDirs.addAll(getDartDirectivePackageNames(file));

lib/src/utils.dart

@@ -31,19 +31,45 @@ final Logger logger = Logger('dependency_validator');
 String bulletItems(Iterable<String> items) =>
     items.map((l) => '  * $l').join('\n');
 
-/// Returns the name of the package referenced in the `include:` directive in an
-/// analysis_options.yaml file, or null if there is not one.
-String? getAnalysisOptionsIncludePackage({String? path}) {
+/// Returns the names of the packages referenced in the `include:` directive in an
+/// analysis_options.yaml file, or null if there are none.
+///
+/// Supports both single string includes:
+///   include: package:flutter_lints/flutter.yaml
+///
+/// And list includes:
+///   include:
+///     - package:flutter_lints/flutter.yaml
+///     - package:another_package/config.yaml
+Set<String>? getAnalysisOptionsIncludePackage({String? path}) {
   final optionsFile = File(p.join(path ?? p.current, 'analysis_options.yaml'));
   if (!optionsFile.existsSync()) return null;
 
   final YamlMap? analysisOptions = loadYaml(optionsFile.readAsStringSync());
   if (analysisOptions == null) return null;
 
-  final String? include = analysisOptions['include'];
-  if (include == null || !include.startsWith('package:')) return null;
+  final dynamic include = analysisOptions['include'];
+  if (include == null) return null;
+
+  final Set<String> packageNames = <String>{};
+
+  if (include is String) {
+    // Handle single string include
+    if (include.startsWith('package:')) {
+      final packageName = Uri.parse(include).pathSegments.first;
+      packageNames.add(packageName);
+    }
+  } else if (include is YamlList) {
+    // Handle list of includes
+    for (final dynamic item in include) {
+      if (item is String && item.startsWith('package:')) {
+        final packageName = Uri.parse(item).pathSegments.first;
+        packageNames.add(packageName);
+      }
+    }
+  }
 
-  return Uri.parse(include).pathSegments.first;
+  return packageNames.isEmpty ? null : packageNames;
 }
 
 /// Returns an iterable of all Dart files (files ending in .dart) in the given

test/utils_test.dart

@@ -43,7 +43,44 @@ linter:
       await d.file('analysis_options.yaml', '''
 include: package:pedantic/analysis_options.1.8.0.yaml
 ''').create();
-      expect(getAnalysisOptionsIncludePackage(path: d.sandbox), 'pedantic');
+      expect(getAnalysisOptionsIncludePackage(path: d.sandbox), {'pedantic'});
+    });
+
+    test('returns package names from list `include:`', () async {
+      await d.file('analysis_options.yaml', '''
+include:
+  - package:flutter_lints/flutter.yaml
+  - package:pedantic/analysis_options.1.8.0.yaml
+''').create();
+      expect(getAnalysisOptionsIncludePackage(path: d.sandbox),
+          {'flutter_lints', 'pedantic'});
+    });
+
+    test('filters out non-package includes from list', () async {
+      await d.file('analysis_options.yaml', '''
+include:
+  - package:flutter_lints/flutter.yaml
+  - analysis_options_shared.yaml
+  - package:pedantic/analysis_options.1.8.0.yaml
+''').create();
+      expect(getAnalysisOptionsIncludePackage(path: d.sandbox),
+          {'flutter_lints', 'pedantic'});
+    });
+
+    test('returns null for list with no package includes', () async {
+      await d.file('analysis_options.yaml', '''
+include:
+  - analysis_options_shared.yaml
+  - ../common_options.yaml
+''').create();
+      expect(getAnalysisOptionsIncludePackage(path: d.sandbox), isNull);
+    });
+
+    test('handles empty list', () async {
+      await d.file('analysis_options.yaml', '''
+include: []
+''').create();
+      expect(getAnalysisOptionsIncludePackage(path: d.sandbox), isNull);
     });
   });