Analyzer uses too much memory when there is many lints enabled

[pedromassango]

The Dart Analyzer is taking 1,811.0MB of RAM when I have 125 lint rules enabled in analysis_options.yaml. After removing the 125 lint rules the memory usage decreased to 450MB (max).

• Analyzer
• Dart SDK Version: the stable version before 2.8.1
• Windows

The lint rules that I had enabled in analysis_options.yaml file are:

analysis_options.yaml

linter:
  rules:
    - always_declare_return_types
    - always_put_control_body_on_new_line
    # conflicts with the Flutter convention of putting {Key key} first and {Widget child} last
    # - always_put_required_named_parameters_first
    - always_require_non_null_named_parameters
    - annotate_overrides
    # conflicts with type_annotate_public_apis and implicit-dynamic:false
    # - avoid_annotating_with_dynamic
    # conflicts with `implicit-dynamic: false`
    #- avoid_as
    - avoid_bool_literals_in_conditional_expressions
    - avoid_catches_without_on_clauses
    - avoid_catching_errors
    - avoid_classes_with_only_static_members
    - avoid_double_and_int_checks
    - avoid_empty_else
    - avoid_field_initializers_in_const_classes
    - avoid_function_literals_in_foreach_calls
    - avoid_implementing_value_types
    - avoid_init_to_null
    - avoid_js_rounded_ints
    - avoid_null_checks_in_equality_operators
    - avoid_positional_boolean_parameters
    - avoid_private_typedef_functions
    - avoid_relative_lib_imports
    - avoid_renaming_method_parameters
    - avoid_return_types_on_setters
    - avoid_returning_null
    - avoid_returning_null_for_void
    - avoid_returning_this
    - avoid_setters_without_getters
    - avoid_single_cascade_in_expression_statements
    - avoid_slow_async_io
    - avoid_types_as_parameter_names
    - avoid_unused_constructor_parameters
    - avoid_void_async
    - await_only_futures
    - camel_case_types
    - cancel_subscriptions
    #- cascade_invocations
    - close_sinks
    - comment_references
    - constant_identifier_names
    - control_flow_in_finally
    - curly_braces_in_flow_control_structures
    - directives_ordering
    - empty_catches
    - empty_constructor_bodies
    - empty_statements
    - file_names
    #- flutter_style_todos
    - hash_and_equals
    - implementation_imports
    - invariant_booleans
    - iterable_contains_unrelated_type
    - join_return_with_assignment
    - library_names
    - library_prefixes
    - list_remove_unrelated_type
    - literal_only_boolean_expressions
    - no_adjacent_strings_in_list
    - no_duplicate_case_values
    - non_constant_identifier_names
    - null_closures
    - omit_local_variable_types
    - one_member_abstracts
    - only_throw_errors
    - overridden_fields
    - package_api_docs
    - package_names
    - package_prefixed_library_names
    - parameter_assignments
    - prefer_adjacent_string_concatenation
    - prefer_asserts_in_initializer_lists
    - prefer_collection_literals
    - prefer_conditional_assignment
    - prefer_const_constructors
    - prefer_const_constructors_in_immutables
    - prefer_const_declarations
    - prefer_const_literals_to_create_immutables
    - prefer_constructors_over_static_methods
    - prefer_contains
    - prefer_equal_for_default_values
    - prefer_expression_function_bodies
    - prefer_final_fields
    - prefer_final_locals
    - prefer_foreach
    - prefer_function_declarations_over_variables
    - prefer_generic_function_type_aliases
    - prefer_initializing_formals
    - prefer_int_literals
    - prefer_interpolation_to_compose_strings
    - prefer_is_empty
    - prefer_is_not_empty
    - prefer_iterable_whereType
    - prefer_mixin
    - prefer_single_quotes
    - prefer_typing_uninitialized_variables
    - prefer_void_to_null
    - recursive_getters
    - slash_for_doc_comments
    - sort_constructors_first
    - sort_pub_dependencies
    - sort_unnamed_constructors_first
    - test_types_in_equals
    - throw_in_finally
    - type_annotate_public_apis
    - type_init_formals
    - unawaited_futures
    - unnecessary_brace_in_string_interps
    - unnecessary_const
    - unnecessary_getters_setters
    - unnecessary_lambdas
    - unnecessary_new
    - unnecessary_null_aware_assignments
    - unnecessary_null_in_if_null_operators
    - unnecessary_overrides
    - unnecessary_parenthesis
    - unnecessary_statements
    - unnecessary_this
    - unrelated_type_equality_checks
    - use_rethrow_when_possible
    - use_string_buffers
    - use_to_and_as_if_applicable
    - valid_regexps
    - void_checks

[jeffreyconcha]

Same with me I encountered this bug after I upgraded to flutter 1.17.0 which has Dart 2.8.1...
I have a 16GB of RAM and whenever i compile my code, the dart.exe file on task manager uses all the available RAM of my PC....Please fix this ASAP. It uses 99 percent of my memory......

I redownloaded the Flutter v1.12.13 w/c has Dart v2.7.0.....and everything backs to normal......PLEASE FIX THIS ASAP!!!!!

[pedromassango]

So lets vote the issue so that it gets more atention.

[easazade]

The way it happens to me is when I start typing Future< in an abstract class like when I want to use an abstract class like an interface and define many methods with return type of Future it just keeps happening. I recommend to do this for reproducing this bug.

I fix it by terminating dart process from task manager and starting it again. but this is really getting annoying. since i can't type Future< because it happens and I have to just copy another method and change that.

here is an example code where this bug shows itself :

@RestApi(baseUrl: APP_BASE_URL)
abstract class RestClient {
  factory RestClient(Dio dio, {String baseUrl}) = _RestClient;

  @GET('/courses')
  Future<List<Course>> getCourses();

  @GET('/trainers')
  Future<List<Trainer>> getTrainers();

  @POST('/signup')
  Future<HttpResponse<void>> signup(@Body() Map<String, dynamic> json);

  @POST('/login')
  Future<HttpResponse<User>> login(@Body() Map<String, dynamic> json);

  @POST('/users/avatar')
  Future<User> addUserAvatar(@Body() Map<String, dynamic> json);

}

note : and I don't even to run my code it just happens when I type

flutter doctor report:

$ flutter doctor -v
[√] Flutter (Channel stable, 1.22.2, on Microsoft Windows [Version 10.0.18363.959], locale en-US)
    • Flutter version 1.22.2 at C:\flutter
    • Framework revision 84f3d28555 (6 weeks ago), 2020-10-15 16:26:19 -0700
    • Engine revision b8752bbfff
    • Dart version 2.10.2

[!] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
    • Android SDK at F:\sdk\Android.SDK
    • Platform android-30, build-tools 30.0.2
    • ANDROID_HOME = F:\sdk\Android.SDK
    • ANDROID_SDK_ROOT = F:\sdk\Android.SDK
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
    X Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/docs/get-started/install/windows#android-setup for more details.

[√] Android Studio (version 4.0)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin version 50.0.1
    • Dart plugin version 193.7547
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)

[√] IntelliJ IDEA Ultimate Edition (version 2019.3)
    • IntelliJ at C:\Program Files\JetBrains\IntelliJ IDEA 2019.3.2
    • Flutter plugin version 45.1.2
    • Dart plugin version 193.7361

[√] VS Code, 64-bit edition (version 1.50.1)
    • VS Code at C:\Program Files\Microsoft VS Code
    • Flutter extension version 3.16.0

[!] Connected device
    ! No devices available

! Doctor found issues in 2 categories.

here is my pubspec.yaml:

name: matjoy_app
description: MatJoy, the Best Fitness app you can find
version: 0.1.4+3


environment:
  sdk: ">=2.10.2 <3.0.0"


dependencies:
  flutter:
    sdk: flutter
  flutter_localizations:
    sdk: flutter
  footprint: ^1.1.6
  intl:
  intl_translation:
  flutter_bloc: ^6.1.1
  connectivity: ^2.0.2
#  shared_preferences: ^0.5.12
  sailor: ^0.7.1
  freezed_annotation: ^0.11.0+1
  json_annotation: ^3.0.1
  fluttertoast: ^7.1.5
  injectable: ^1.0.4
  get_it: ^4.0.4
  url_launcher: ^5.7.10
  shamsi_date: ^0.9.1
  tuple: ^1.0.3
  dio: ^3.0.10
  retrofit: ^1.3.4+1
  auto_size_text: ^2.1.0
  carousel_slider: ^2.3.1
  flutter_custom_clippers: ^1.1.2
  cached_network_image: ^2.3.3
  flushbar: ^1.10.4
  skeleton_text: ^1.0.0
  badges: ^1.1.4
#  explode_view: ^1.0.4
  #  permission_handler: ^5.0.1+1
  #  moor: ^3.3.1
  #  sqlite3_flutter_libs: ^0.2.0
#  confetti: ^0.5.4+1
  chewie: ^0.12.0

#  ff_navigation_bar: ^0.1.5
#  video_player: ^1.0.0
  video_thumbnail: ^0.2.4
  flutter_group_sliver: ^0.0.2
  flutter_verification_code: ^0.2.1
  persian_datepicker: ^1.3.1
  device_preview: ^0.4.8
  file_picker: ^1.9.0+1
  #  adaptive_dialog: ^0.9.0+1
  faker: ^1.3.0
  dotted_border: ^1.0.7
  hive: ^1.4.4+1
  lottie: ^0.7.0+1
  hive_flutter: ^0.3.1
  fl_chart: ^0.12.0
  path_provider:
  path:

  ################################# icons ##########################################
  cupertino_icons: ^1.0.0
  feather_icons_flutter: ^4.7.4 # https://feathericons.com/
#  ionicons: ^0.0.3 #https://ionicons.com/
#  community_material_icon: ^5.4.55 #https://materialdesignicons.com/
#  font_awesome_flutter: ^8.5.0 # https://fontawesome.com/icons
#  line_icons: ^0.2.0 # https://icons8.com/line-awesome

dev_dependencies:
  flutter_test:
    sdk: flutter

  injectable_generator: ^1.0.4
  retrofit_generator: ^1.4.0+2
  hive_generator: ^0.8.2
  #  moor_generator: ^3.3.1
  build_runner:
  mockito: ^4.1.1
  freezed: ^0.11.5
  # preview: ^0.0.8
  json_serializable: ^3.5.0
  flutter_launcher_icons: ^0.8.1
  test: ^1.15.2
  bloc_test: ^7.1.0

dependency_overrides:
  freezed_annotation: ^0.11.0+1

 #just run -> flutter pub run flutter_launcher_icons:main
flutter_icons:
   #    image_path: "assets/images/icon-128x128.png"
  image_path_android: "assets/icons/icon_legacy.png"
  image_path_ios: "assets/icons/icon_legacy.png"
  android: true # can specify file name here e.g. "ic_launcher"
  ios: true # can specify file name here e.g. "My-Launcher-Icon"
  adaptive_icon_background: "assets/icons/icon_back.png" # only available for Android 8.0 devices and above
  adaptive_icon_foreground: "assets/icons/icon_front.png" # only available for Android 8.0 devices and above


# run -> fluttergen -c example/pubspec.yaml
flutter_gen:
  output: lib/gen/ # Optional (default: lib/gen/)
  lineLength: 120 # Optional (default: 80)

#  integrations:
#    flutter_svg: true

#  colors:
#    inputs:
#      - assets/color/colors.xml


flutter:

  uses-material-design: true

  assets:
    - assets/images/app_logo.png
    - assets/images/app_logo_orange.png
    - assets/images/arm_image.png
    - assets/images/image_placeholder.png
    - assets/images/image_placeholder_small.png
    - assets/images/sidebar_logo.png
    - assets/images/trainer.png
    - assets/images/trainer_shadow.png
    - assets/images/trainee.png
    - assets/images/trainee_shadow.png
    - assets/images/logo_and_name.png
    - assets/images/login_top_shape_green.png
    - assets/images/login_top_shape_orange.png
    - assets/images/bar_chart.png
    - assets/json/logo_lottie.json
    - assets/video/logo_trailer.mp4
    - assets/video/trailer_1.mp4

  fonts:
    - family: IranYekan
      fonts:
        - asset: assets/fonts/iranyekan/IRANYekanMobileThin.ttf
          weight: 100
        - asset: assets/fonts/iranyekan/IRANYekanMobileLight.ttf
          weight: 300
        - asset: assets/fonts/iranyekan/IRANYekanMobileRegular.ttf
          weight: 400
        - asset: assets/fonts/iranyekan/IRANYekanMobileMedium.ttf
          weight: 500
        - asset: assets/fonts/iranyekan/IRANYekanMobileBold.ttf
          weight: 700
        - asset: assets/fonts/iranyekan/IRANYekanMobileExtraBold.ttf
          weight: 800
        - asset: assets/fonts/iranyekan/IRANYekanMobileBlack.ttf
          weight: 900
    - family: IranYekan-FD
      fonts:
        - asset: assets/fonts/iranyekan/fd/IRANYekanMobileThin-FD.ttf
          weight: 100
        - asset: assets/fonts/iranyekan/fd/IRANYekanMobileLight-FD.ttf
          weight: 300
        - asset: assets/fonts/iranyekan/fd/IRANYekanMobileRegular-FD.ttf
          weight: 400
        - asset: assets/fonts/iranyekan/fd/IRANYekanMobileMedium-FD.ttf
          weight: 500
        - asset: assets/fonts/iranyekan/fd/IRANYekanMobileBold-FD.ttf
          weight: 700
        - asset: assets/fonts/iranyekan/fd/IRANYekanMobileExtraBold-FD.ttf
          weight: 800
        - asset: assets/fonts/iranyekan/fd/IRANYekanMobileBlack-FD.ttf
          weight: 900
    - family: IranSans
      fonts:
        - asset: assets/fonts/iransans/IRANSansMobile_UltraLight.ttf
          weight: 100
        - asset: assets/fonts/iransans/IRANSansMobile_Light.ttf
          weight: 300
        - asset: assets/fonts/iransans/IRANSansMobile.ttf
          weight: 400
        - asset: assets/fonts/iransans/IRANSansMobile_Medium.ttf
          weight: 500
        - asset: assets/fonts/iransans/IRANSansMobile_Bold.ttf
          weight: 700
        - asset: assets/fonts/iransans/IRANSansMobile_Black.ttf
          weight: 900
    - family: IranSans-FD
      fonts:
        - asset: assets/fonts/iransans/fd/IRANSansMobile_FaNum_UltraLight.ttf
          weight: 100
        - asset: assets/fonts/iransans/fd/IRANSansMobile_FaNum_Light.ttf
          weight: 300
        - asset: assets/fonts/iransans/fd/IRANSansMobile_FaNum.ttf
          weight: 400
        - asset: assets/fonts/iransans/fd/IRANSansMobile_FaNum_Medium.ttf
          weight: 500
        - asset: assets/fonts/iransans/fd/IRANSansMobile_FaNum_Bold.ttf
          weight: 700
        - asset: assets/fonts/iransans/fd/IRANSansMobile_FaNum_Black.ttf
          weight: 900

    - family: MatjoyIcons
      fonts:
        - asset: assets/fonts/icons/MatjoyIcons.ttf
    - family: MatjoyIcons2
      fonts:
        - asset: assets/fonts/icons/MatjoyIcons2.ttf

[bernaferrari]

So.. is this issue responsible for my Dart process eating over 18GB of RAM? It only happens after a few hours. #44792

[bernaferrari]

Is this related to flutter/flutter#90868?

[simc]

This is still a big issue. Our project with many packages consistently uses more than 10GB of ram.