class CustomPlugin extends ServerPlugin {
  CustomPlugin(ResourceProvider provider): super(provider);
  @override
  List<String> get fileGlobsToAnalyze => const ['*.dart'];
  @override
  String get name => 'My custom plugin';
  @override
  String get version => '1.0.0';
  @override
  AnalysisDriverGeneric createAnalysisDriver(ContextRoot contextRoot) {
    // implementation
  }
}

@override
  AnalysisDriverGeneric createAnalysisDriver(plugin.ContextRoot contextRoot) {
    final root = ContextRoot(contextRoot.root, contextRoot.exclude,
        pathContext: resourceProvider.pathContext)
      ..optionsFilePath = contextRoot.optionsFile;
    final contextBuilder = ContextBuilder(resourceProvider, sdkManager, null)
      ..analysisDriverScheduler = analysisDriverScheduler
      ..byteStore = byteStore
      ..performanceLog = performanceLog
      ..fileContentOverlay = fileContentOverlay;
    final dartDriver = contextBuilder.buildDriver(root);
    dartDriver.results.listen((analysisResult) {
      _processResult(dartDriver, analysisResult);
    });
    return dartDriver;
  }

abstract class ResolveResult implements AnalysisResultWithErrors {
  /// The content of the file that was scanned, parsed and resolved.
  String get content;
  /// The element representing the library containing the compilation [unit].
  LibraryElement get libraryElement;
  /// The type provider used when resolving the compilation [unit].
  TypeProvider get typeProvider;
  /// The type system used when resolving the compilation [unit].
  TypeSystem get typeSystem;
  /// The fully resolved compilation unit for the [content].
  CompilationUnit get unit;
}

String checkCompilationUnit(CompilationUnit unit) {
  final visitor = _Visitor();
  unit.visitChildren(visitor);
  return visitor.result;
}
class _Visitor extends RecursiveAstVisitor<void> {
  String result = ‘’;
  @override
  void visitMethodInvocation(MethodInvocation node) {
    super.visitMethodInvocation(node);
    // implementation
  }
}

void start(Iterable<String> _, SendPort sendPort) {
  ServerPluginStarter(CustomPlugin(PhysicalResourceProvider.INSTANCE))
      .start(sendPort);

dart_code_metrics:
  anti-patterns:
    - long-method
    - long-parameter-list
  metrics:
    cyclomatic-complexity: 20
    number-of-arguments: 4
  metrics-exclude:
    - test/**
  rules:
    - binary-expression-operand-order
    - double-literal-format
    - newline-before-return
    - no-boolean-literal-compare
    - no-equal-then-else
    - prefer-conditional-expressions
    - prefer-trailing-comma-for-collection

const _content = '''
Object function(Object param) {
  return null;
}
''';
void main() {
  test('should return correct result', () {
    final sourceUrl = Uri.parse('/example.dart');
    final parseResult = parseString(
        content: _content,
        featureSet: FeatureSet.fromEnableFlags([]),
        throwIfDiagnostics: false);
    final result = checkCompilationUnit(parseResult.unit);
    expect(
      result,
      isNotEmpty,
    );
  });
}