void visitNamedType()

in lib/src/rules/prefer_void_to_null.dart [114:156]

31 lines of code
15 McCabe index (conditional complexity)


  void visitNamedType(NamedType node) {
    var nodeType = node.type;
    if (nodeType == null || !nodeType.isDartCoreNull) {
      return;
    }

    var parent = node.parent;

    // Null Function()
    if (parent is GenericFunctionType) {
      return;
    }

    // Function(Null)
    if (parent is SimpleFormalParameter &&
        parent.parent is FormalParameterList &&
        parent.parent?.parent is GenericFunctionType) {
      return;
    }

    // <Null>[] or <Null, Null>{}
    if (parent is TypeArgumentList) {
      var literal = parent.parent;
      if (literal is ListLiteral && literal.elements.isEmpty) {
        return;
      } else if (literal is SetOrMapLiteral && literal.elements.isEmpty) {
        return;
      }
    }

    // extension _ on Null {}
    if (parent is ExtensionDeclaration) {
      return;
    }

    // https://github.com/dart-lang/linter/issues/2792
    if (parent is MethodDeclaration &&
        isVoidIncompatibleOverride(parent, node)) {
      return;
    }

    rule.reportLint(node.name);
  }