Analysis server fails to initialize/create contexts with an invalid entry in lint rules

[DanTup]

I had this in my analysis_options.yaml (note the blank entry at the end):

linter:
  rules:
    - camel_case_types
    - file_names
    - non_constant_identifier_names
    - comment_references
    -

It caused the server to fail to create analysis roots during initialization:

1714403559225:Ex:An error occurred while handling initialized notification
type 'Null' is not a subtype of type 'Object' in type cast
#0      YamlNodeExtension.valueOrThrow (package::analyzer/src/util/yaml.dart::147::36)
#1      _LintConfig.asString (package::analyzer/src/lint/config.dart::93::47)
#2      _LintConfig._parseYaml.<anonymous closure> (package::analyzer/src/lint/config.dart::136::29)
#3      _LinkedHashMapMixin.forEach (dart::collection-patch/compact_hash.dart::633::13)
#4      MapView.forEach (dart::collection/maps.dart::347::10)
#5      _LintConfig._parseYaml (package::analyzer/src/lint/config.dart::117::16)
#6      new LintConfig.parseMap (package::analyzer/src/lint/config.dart::38::62)
#7      parseConfig (package::analyzer/src/lint/config.dart::15::25)
#8      AnalysisOptionsImplExtensions.applyOptions (package::analyzer/src/analysis_options/apply_options.dart::229::18)
#9      ContextBuilderImpl._createOptionsMap (package::analyzer/src/dart/analysis/context_builder.dart::210::15)
#10     ContextBuilderImpl.createContext (package::analyzer/src/dart/analysis/context_builder.dart::135::15)
#11     new AnalysisContextCollectionImpl (package::analyzer/src/dart/analysis/analysis_context_collection.dart::104::36)
#12     ContextManagerImpl._createAnalysisContexts.performContextRebuildGuarded.performContextRebuild (package::analysis_server/src/context_manager.dart::547::40)
<asynchronous suspension>
#13     ContextManagerImpl._createAnalysisContexts.performContextRebuildGuarded (package::analysis_server/src/context_manager.dart::697::11)
<asynchronous suspension>
#14     _CancellingTaskQueue.queue.<anonymous closure> (package::analysis_server/src/context_manager.dart::981::15)
<asynchronous suspension>
#15     ContextManagerImpl.setRoots (package::analysis_server/src/context_manager.dart::363::5)
<asynchronous suspension>
#16     LspAnalysisServer._refreshAnalysisRoots (package::analysis_server/src/lsp/lsp_analysis_server.dart::1072::9)
<asynchronous suspension>
#17     LspAnalysisServer.updateWorkspaceFolders (package::analysis_server/src/lsp/lsp_analysis_server.dart::940::5)
<asynchronous suspension>

This seems like an error that should be non-fatal.

[lucasjinreal]

Hello. my I ask when will flutter have this patch update?

Currently using flutter latest 3.24.1 suffering from this issue for a long time....
Without dart LSP, i can not code flutter.....

[bwilkerson]

Given that the fix landed on Aug. 28, I would expect to see it released in Flutter 3.26.

Currently using flutter latest 3.24.1 suffering from this issue for a long time....

I'm sorry for your difficulty, but I'm not sure I understand the cause of the problem you're experiencing. As I understand it, this issue is about a problem that occurs when the analysis_options.yaml file contains invalid data. If you fix the content of the file to be valid then it's my understanding that analysis should work as expected.

Can you explain what it is that's preventing you from using VS Code (or whatever LSP client you're using)?

[bwilkerson]

Sorry, I hadn't seen that the same comment had been raised and answered in #56429 (comment). You can ignore my question.