[SEVERE] ngdart on web/main.dart: Null check operator used on a null value #0 ElementAnnotationExtensions.targetKinds (package:analyzer/src/dart/element/extensions.dart:44:53)

[insinfo]

Which ng* package(s) are the source of the bug?

ngdart

Which operating system(s) does this bug appear on?

Windows

Which browser(s) does this bug appear on?

Chrome 117.0.5938.132 64 bits

Is this a regression?

Yes

Description

I've been working on an AngularDart project of mine every day, and today I started getting this error "ngdart on web/main.dart: Null check operator used on a null value"

Please provide the steps to reproduce the bug

create a simple angular project and run webdev serve

https://github.com/insinfo/dart_bug_demo

Please provide the exception or error you saw

PS C:\MyDartProjects\dart_bug_demo> webdev serve
[INFO] Building new asset graph completed, took 1.7s
[INFO] Checking for unexpected pre-existing outputs. completed, took 0ms
[INFO] Serving `web` on http://127.0.0.1:8080
[SEVERE] ngdart on web/main.dart: Null check operator used on a null value
#0      ElementAnnotationExtensions.targetKinds (package:analyzer/src/dart/element/extensions.dart:44:53)
#1      BestPracticesVerifier.visitAnnotation (package:analyzer/src/error/best_practices_verifier.dart:323:25)
#2      AnnotationImpl.accept (package:analyzer/src/dart/ast/ast.dart:318:50)
#3      NodeListImpl.accept (package:analyzer/src/dart/ast/ast.dart:8777:20)
#4      AnnotatedNodeImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:154:17)
#5      ClassDeclarationImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:1823:11)
#6      RecursiveAstVisitor.visitClassDeclaration (package:analyzer/dart/ast/visitor.dart:793:10)
#7      BestPracticesVerifier.visitClassDeclaration (package:analyzer/src/error/best_practices_verifier.dart:404:13)
#8      ClassDeclarationImpl.accept (package:analyzer/src/dart/ast/ast.dart:1799:50)
#9      NodeListImpl.accept (package:analyzer/src/dart/ast/ast.dart:8777:20)
#10     CompilationUnitImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:2455:21)
#11     RecursiveAstVisitor.visitCompilationUnit (package:analyzer/dart/ast/visitor.dart:817:10)
#12     CompilationUnitImpl.accept (package:analyzer/src/dart/ast/ast.dart:2448:50)
#13     LibraryAnalyzer._computeHints (package:analyzer/src/dart/analysis/library_analyzer.dart:344:10)
#14     LibraryAnalyzer._computeDiagnostics.<anonymous closure> (package:analyzer/src/dart/analysis/library_analyzer.dart:274:9)
#15     _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:617:13)
#16     LibraryAnalyzer._computeDiagnostics (package:analyzer/src/dart/analysis/library_analyzer.dart:273:13)        
#17     LibraryAnalyzer.analyze (package:analyzer/src/dart/analysis/library_analyzer.dart:92:5)
#18     AnalysisDriver._computeAnalysisResult.<anonymous closure> (package:analyzer/src/dart/analysis/driver.dart:1373:11)
<asynchronous suspension>
#19     PerformanceLog.runAsync (package:analyzer/src/dart/analysis/performance_logger.dart:50:14)
<asynchronous suspension>
#20     AnalysisDriver._computeErrors (package:analyzer/src/dart/analysis/driver.dart:1410:26)
<asynchronous suspension>
#21     AnalysisDriver.performWork (package:analyzer/src/dart/analysis/driver.dart:1118:20)
<asynchronous suspension>
#22     AnalysisDriverScheduler._run (package:analyzer/src/dart/analysis/driver.dart:2171:7)
<asynchronous suspension>

[INFO] 10.7s elapsed, 29/33 actions completed.^CDeseja finalizar o arquivo em lotes (S/N)? s
PS C:\MyDartProjects\dart_bug_demo>

Please provide the dependency environment you discovered this bug in (run dart pub deps -s compact)

PS C:\MyDartProjects\dart_bug_demo> dart pub deps -s compact
Dart SDK 2.18.7
dart_bug_demo 0.0.0

dependencies:
- ngdart 7.1.1 [built_collection built_value collection intl js logging meta stack_trace stream_transform ngast ngcompiler build build_config code_builder csslib path quiver source_gen source_span]

dev dependencies:
- build_runner 2.3.3 [args async analyzer build build_config build_daemon build_resolvers build_runner_core code_builder collection crypto dart_style frontend_server_client glob graphs http_multi_server io js logging meta mime package_config path pool pub_semver pubspec_parse shelf shelf_web_socket stack_trace stream_transform timing watcher web_socket_channel yaml]
- build_web_compilers 3.2.6 [analyzer archive bazel_worker build build_config build_modules collection glob js logging path pool scratch_space source_maps source_span stack_trace]

transitive dependencies:
- _fe_analyzer_shared 47.0.0 [meta]
- analyzer 4.7.0 [_fe_analyzer_shared collection convert crypto glob meta package_config path pub_semver source_span watcher yaml]
- archive 3.4.2 [crypto path pointycastle]
- args 2.4.1
- async 2.11.0 [collection meta]
- bazel_worker 1.0.2 [async protobuf]
- boolean_selector 2.1.1 [source_span string_scanner]
- build 2.3.1 [analyzer async convert crypto glob logging meta path]
- build_config 1.1.1 [checked_yaml json_annotation path pubspec_parse yaml]
- build_daemon 3.1.1 [built_collection built_value http_multi_server logging path pool shelf shelf_web_socket stream_transform watcher web_socket_channel]
- build_modules 4.0.6 [analyzer async bazel_worker build build_config collection crypto glob graphs json_annotation logging path scratch_space stream_transform]
- build_resolvers 2.0.10 [analyzer async build crypto graphs logging path package_config pool pub_semver stream_transform yaml]
- build_runner_core 7.2.7 [async build build_config build_resolvers collection convert crypto glob graphs json_annotation logging meta path package_config pool timing watcher yaml]
- build_test 2.1.7 [async build build_config build_resolvers crypto glob html logging matcher package_config path stream_transform test test_core watcher]
- built_collection 5.1.1
- built_value 8.6.3 [built_collection collection fixnum meta]
- charcode 1.3.1
- checked_yaml 2.0.2 [json_annotation source_span yaml]
- clock 1.1.1
- code_builder 4.4.0 [built_collection built_value collection matcher meta]
- collection 1.18.0
- convert 3.1.1 [typed_data]
- coverage 1.6.3 [args logging package_config path source_maps stack_trace vm_service]
- crypto 3.0.2 [typed_data]
- csslib 0.17.2 [source_span]
- dart_style 2.2.4 [analyzer args path pub_semver source_span]
- file 6.1.4 [meta path]
- fixnum 1.0.1
- frontend_server_client 3.2.0 [async path]
- glob 2.1.1 [async collection file path string_scanner]
- graphs 2.3.1 [collection]
- html 0.15.3 [csslib source_span]
- http_multi_server 3.2.1 [async]
- http_parser 4.0.2 [collection source_span string_scanner typed_data]
- intl 0.17.0 [clock path]
- io 1.0.4 [meta path string_scanner]
- js 0.6.5 [meta]
- json_annotation 4.8.0 [meta]
- logging 1.1.1
- matcher 0.12.16 [async meta stack_trace term_glyph test_api]
- meta 1.10.0
- mime 1.0.4
- ngast 2.1.4 [charcode collection meta source_span string_scanner]
- ngcompiler 2.1.3 [ngdart ngast analyzer args build build_test code_builder collection csslib dart_style logging meta package_config path source_gen source_span stack_trace]
- node_preamble 2.0.2
- package_config 2.1.0 [path]
- path 1.8.3
- pointycastle 3.7.3 [collection convert js]
- pool 1.5.1 [async stack_trace]
- protobuf 2.1.0 [fixnum collection meta]
- pub_semver 2.1.4 [collection meta]
- pubspec_parse 1.2.3 [checked_yaml collection json_annotation pub_semver yaml]
- quiver 3.2.1 [matcher]
- scratch_space 1.0.1 [build crypto path pool]
- shelf 1.4.1 [async collection http_parser path stack_trace stream_channel]
- shelf_packages_handler 3.0.2 [path shelf shelf_static]
- shelf_static 1.1.2 [convert http_parser mime path shelf]
- shelf_web_socket 1.0.4 [shelf stream_channel web_socket_channel]
- source_gen 1.2.6 [analyzer async build dart_style glob meta path source_span yaml]
- source_map_stack_trace 2.1.1 [path source_maps stack_trace]
- source_maps 0.10.12 [source_span]
- source_span 1.10.0 [collection path term_glyph]
- stack_trace 1.11.1 [path]
- stream_channel 2.1.1 [async]
- stream_transform 2.1.0
- string_scanner 1.2.0 [source_span]
- term_glyph 1.2.1
- test 1.24.3 [analyzer async boolean_selector collection coverage http_multi_server io js node_preamble package_config path pool shelf shelf_packages_handler shelf_static shelf_web_socket source_span stack_trace stream_channel typed_data web_socket_channel webkit_inspection_protocol yaml test_api test_core matcher]
- test_api 0.6.0 [async boolean_selector collection meta source_span stack_trace stream_channel string_scanner term_glyph]
- test_core 0.5.3 [analyzer async args boolean_selector collection coverage frontend_server_client glob io meta package_config path pool source_map_stack_trace source_maps source_span stack_trace stream_channel vm_service yaml test_api]
- timing 1.0.1 [json_annotation]
- typed_data 1.3.2 [collection]
- vm_service 11.2.0
- watcher 1.0.2 [async path]
- web_socket_channel 2.4.0 [async crypto stream_channel]
- webkit_inspection_protocol 1.2.0 [logging]
- yaml 3.1.1 [collection source_span string_scanner]
PS C:\MyDartProjects\dart_bug_demo>

Anything else?

No response

[insinfo]

It's strange because it's reporting the problem in this line 44 var index = kindObject.getField('index')!.toIntValue()!;

C:\Users\isaque.neves\AppData\Local\Pub\Cache\hosted\pub.dartlang.org\analyzer-4.7.0\lib\src\dart\element\extensions.dart

If I edit this file by placing an if to check if kindObject.getField('index') != null the problem apparently disappears

after

/// Return the target kinds defined for this [ElementAnnotation].
  Set<TargetKind> get targetKinds {
    final element = this.element;
    InterfaceElement? interfaceElement;
    if (element is PropertyAccessorElement) {
      if (element.isGetter) {
        var type = element.returnType;
        if (type is InterfaceType) {
          interfaceElement = type.element2;
        }
      }
    } else if (element is ConstructorElement) {
      interfaceElement = element.enclosingElement3;
    }
    if (interfaceElement == null) {
      return const <TargetKind>{};
    }
    for (var annotation in interfaceElement.metadata) {
      if (annotation.isTarget) {
        var value = annotation.computeConstantValue()!;
        var kinds = <TargetKind>{};

        for (var kindObject in value.getField('kinds')!.toSetValue()!) {
          // We can't directly translate the index from the analyzed TargetKind
          // constant to TargetKinds.values because the analyzer from the SDK
          // may have been compiled with a different version of pkg:meta.
          // add this if
        if(kindObject.getField('index') != null){
            var index = kindObject.getField('index')!.toIntValue()!;
            var targetKindClass =
                (kindObject.type as InterfaceType).element2 as EnumElementImpl;
            // Instead, map constants to their TargetKind by comparing getter
            // names.
            var getter = targetKindClass.constants[index];
            var name = 'TargetKind.${getter.name}';

            var foundTargetKind = _targetKindsByName[name];
            if (foundTargetKind != null) {
              kinds.add(foundTargetKind);
            }
          }
        }
        return kinds;
      }
    }
    return const <TargetKind>{};
  }