🚀 Migrate to Flutter 3 (#91)

Author: AlexV525

CHANGELOG.md

@@ -4,6 +4,10 @@ that can be found in the LICENSE file. -->
 
 # Changelog
 
+## 3.2.0
+
+Migrate to Flutter 3, drop supports for previous Flutter versions.
+
 ## 3.1.0
 
 ### New features

analysis_options.yaml

@@ -1,53 +1,35 @@
 # Specify analysis options.
 #
-# Until there are meta linter rules, each desired lint must be explicitly enabled.
-# See: https://github.com/dart-lang/linter/issues/288
-#
 # For a list of lints, see: http://dart-lang.github.io/linter/lints/
 # See the configuration guide for more
-# https://github.com/dart-lang/sdk/tree/master/pkg/analyzer#configuring-the-analyzer
+# https://github.com/dart-lang/sdk/tree/main/pkg/analyzer#configuring-the-analyzer
 #
 # There are other similar analysis options files in the flutter repos,
 # which should be kept in sync with this file:
 #
 #   - analysis_options.yaml (this file)
-#   - packages/flutter/lib/analysis_options_user.yaml
 #   - https://github.com/flutter/plugins/blob/master/analysis_options.yaml
 #   - https://github.com/flutter/engine/blob/master/analysis_options.yaml
+#   - https://github.com/flutter/packages/blob/master/analysis_options.yaml
 #
-# This file contains the analysis options used by Flutter tools, such as IntelliJ,
-# Android Studio, and the `flutter analyze` command.
+# This file contains the analysis options used for code in the flutter/flutter
+# repository.
 
 analyzer:
-  strong-mode:
-    implicit-casts: false
-    implicit-dynamic: false
+  language:
+    strict-casts: true
+    strict-raw-types: true
   errors:
     # treat missing required parameters as a warning (not a hint)
     missing_required_param: warning
     # treat missing returns as a warning (not a hint)
     missing_return: warning
-    # allow having TODOs in the code
+    # allow having TODO comments in the code
     todo: ignore
-    # allow self-reference to deprecated members (we do this because otherwise we have
-    # to annotate every member in every test, assert, etc, when we deprecate something)
-    deprecated_member_use_from_same_package: ignore
-    # Ignore analyzer hints for updating pubspecs when using Future or
-    # Stream and not importing dart:async
-    # Please see https://github.com/flutter/flutter/pull/24528 for details.
-    sdk_version_async_exported_from_core: ignore
-  exclude:
-    - "bin/cache/**"
-    # the following two are relative to the stocks example and the flutter package respectively
-    # see https://github.com/dart-lang/sdk/issues/28463
-    - "lib/i18n/messages_*.dart"
-    - "lib/src/http/**"
-    - "test_fixes/**"
 
 linter:
   rules:
-    # these rules are documented on and in the same order as
-    # the Dart Lint rules page to make maintenance easier
+    # This list is derived from the list of all available lints located at
     # https://github.com/dart-lang/linter/blob/master/example/all.yaml
     - always_declare_return_types
     - always_put_control_body_on_new_line
@@ -57,62 +39,68 @@ linter:
     # - always_use_package_imports # we do this commonly
     - annotate_overrides
     # - avoid_annotating_with_dynamic # conflicts with always_specify_types
-    # - avoid_as # required for implicit-casts: true
     - avoid_bool_literals_in_conditional_expressions
-    # - avoid_catches_without_on_clauses # we do this commonly
-    # - avoid_catching_errors # we do this commonly
+    # - avoid_catches_without_on_clauses # blocked on https://github.com/dart-lang/linter/issues/3023
+    # - avoid_catching_errors # blocked on https://github.com/dart-lang/linter/issues/3023
     - avoid_classes_with_only_static_members
-    # - avoid_double_and_int_checks # only useful when targeting JS runtime
+    - avoid_double_and_int_checks
+    - avoid_dynamic_calls
     - avoid_empty_else
     - avoid_equals_and_hash_code_on_mutable_classes
-    # - avoid_escaping_inner_quotes # not yet tested
+    - avoid_escaping_inner_quotes
     - avoid_field_initializers_in_const_classes
+    # - avoid_final_parameters # incompatible with prefer_final_parameters
     - avoid_function_literals_in_foreach_calls
-    # - avoid_implementing_value_types # not yet tested
+    - avoid_implementing_value_types
     - avoid_init_to_null
-    # - avoid_js_rounded_ints # only useful when targeting JS runtime
+    - avoid_js_rounded_ints
+    # - avoid_multiple_declarations_per_line # seems to be a stylistic choice we don't subscribe to
     - avoid_null_checks_in_equality_operators
-    # - avoid_positional_boolean_parameters # not yet tested
-    # - avoid_print # not yet tested
+    # - avoid_positional_boolean_parameters # would have been nice to enable this but by now there's too many places that break it
+    - avoid_print
     # - avoid_private_typedef_functions # we prefer having typedef (discussion in https://github.com/flutter/flutter/pull/16356)
-    # - avoid_redundant_argument_values # not yet tested
+    - avoid_redundant_argument_values
     - avoid_relative_lib_imports
     - avoid_renaming_method_parameters
     - avoid_return_types_on_setters
-    # - avoid_returning_null # there are plenty of valid reasons to return null
-    # - avoid_returning_null_for_future # not yet tested
+    # - avoid_returning_null # still violated by some pre-nnbd code that we haven't yet migrated
+    - avoid_returning_null_for_future
     - avoid_returning_null_for_void
-    # - avoid_returning_this # there are plenty of valid reasons to return this
-    # - avoid_setters_without_getters # not yet tested
+    # - avoid_returning_this # there are enough valid reasons to return `this` that this lint ends up with too many false positives
+    - avoid_setters_without_getters
     - avoid_shadowing_type_parameters
     - avoid_single_cascade_in_expression_statements
     - avoid_slow_async_io
-    # - avoid_type_to_string # we do this commonly
+    - avoid_type_to_string
     - avoid_types_as_parameter_names
     # - avoid_types_on_closure_parameters # conflicts with always_specify_types
-    # - avoid_unnecessary_containers # not yet tested
+    - avoid_unnecessary_containers
     - avoid_unused_constructor_parameters
     - avoid_void_async
-    # - avoid_web_libraries_in_flutter # not yet tested
+    # - avoid_web_libraries_in_flutter # we use web libraries in web-specific code, and our tests prevent us from using them elsewhere
     - await_only_futures
     - camel_case_extensions
     - camel_case_types
     - cancel_subscriptions
-    # - cascade_invocations # not yet tested
+    # - cascade_invocations # doesn't match the typical style of this repo
     - cast_nullable_to_non_nullable
     # - close_sinks # not reliable enough
-    # - comment_references # blocked on https://github.com/flutter/flutter/issues/20765
+    # - comment_references # blocked on https://github.com/dart-lang/linter/issues/1142
+    # - conditional_uri_does_not_exist # not yet tested
     # - constant_identifier_names # needs an opt-out https://github.com/dart-lang/linter/issues/204
     - control_flow_in_finally
     # - curly_braces_in_flow_control_structures # not required by flutter style
-    # - diagnostic_describe_all_properties # not yet tested
+    - depend_on_referenced_packages
+    - deprecated_consistency
+    # - diagnostic_describe_all_properties # enabled only at the framework level (packages/flutter/lib)
     - directives_ordering
-    # - do_not_use_environment # we do this commonly
+    # - do_not_use_environment # there are appropriate times to use the environment, especially in our tests and build logic
     - empty_catches
     - empty_constructor_bodies
     - empty_statements
+    - eol_at_end_of_file
     - exhaustive_cases
-    # - file_names # not yet tested
+    - file_names
     - flutter_style_todos
     - hash_and_equals
     - implementation_imports
@@ -122,24 +110,28 @@ linter:
     - leading_newlines_in_multiline_strings
     - library_names
     - library_prefixes
+    - library_private_types_in_public_api
     # - lines_longer_than_80_chars # not required by flutter style
     - list_remove_unrelated_type
-    # - literal_only_boolean_expressions # too many false positives: https://github.com/dart-lang/sdk/issues/34181
-    # - missing_whitespace_between_adjacent_strings # not yet tested
+    # - literal_only_boolean_expressions # too many false positives: https://github.com/dart-lang/linter/issues/453
+    - missing_whitespace_between_adjacent_strings
     - no_adjacent_strings_in_list
-    # - no_default_cases # too many false positives
+    - no_default_cases
     - no_duplicate_case_values
+    - no_leading_underscores_for_library_prefixes
+    - no_leading_underscores_for_local_identifiers
     - no_logic_in_create_state
     # - no_runtimeType_toString # ok in tests; we enable this only in packages/
     - non_constant_identifier_names
+    - noop_primitive_operations
     - null_check_on_nullable_type_parameter
-    # - null_closures # not required by flutter style
+    - null_closures
     # - omit_local_variable_types # opposite of always_specify_types
     # - one_member_abstracts # too many false positives
     # - only_throw_errors # https://github.com/flutter/flutter/issues/5792
     - overridden_fields
     - package_api_docs
-    # - package_names # non conforming packages in sdk
+    - package_names
     - package_prefixed_library_names
     # - parameter_assignments # we do this commonly
     - prefer_adjacent_string_concatenation
@@ -159,33 +151,38 @@ linter:
     - prefer_final_fields
     - prefer_final_in_for_each
     - prefer_final_locals
+    # - prefer_final_parameters # we should enable this one day when it can be auto-fixed (https://github.com/dart-lang/linter/issues/3104), see also parameter_assignments
     - prefer_for_elements_to_map_fromIterable
     - prefer_foreach
-    # - prefer_function_declarations_over_variables # not yet tested
+    - prefer_function_declarations_over_variables
     - prefer_generic_function_type_aliases
     - prefer_if_elements_to_conditional_expressions
     - prefer_if_null_operators
     - prefer_initializing_formals
     - prefer_inlined_adds
-    # - prefer_int_literals # not yet tested
-    # - prefer_interpolation_to_compose_strings # not yet tested
+    # - prefer_int_literals # conflicts with https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#use-double-literals-for-double-constants
+    - prefer_interpolation_to_compose_strings
     - prefer_is_empty
     - prefer_is_not_empty
     - prefer_is_not_operator
     - prefer_iterable_whereType
-    # - prefer_mixin # https://github.com/dart-lang/language/issues/32
-    # - prefer_null_aware_operators # disable until NNBD, see https://github.com/flutter/flutter/pull/32711#issuecomment-492930932
-    # - prefer_relative_imports # not yet tested
+    # - prefer_mixin # Has false positives, see https://github.com/dart-lang/linter/issues/3018
+    # - prefer_null_aware_method_calls # "call()" is confusing to people new to the language since it's not documented anywhere
+    - prefer_null_aware_operators
+    - prefer_relative_imports
     - prefer_single_quotes
     - prefer_spread_collections
     - prefer_typing_uninitialized_variables
     - prefer_void_to_null
-    # - provide_deprecation_message # not yet tested
+    - provide_deprecation_message
     # - public_member_api_docs # enabled on a case-by-case basis; see e.g. packages/analysis_options.yaml
     - recursive_getters
-    # - sized_box_for_whitespace # not yet tested
+    # - require_trailing_commas # blocked on https://github.com/dart-lang/sdk/issues/47441
+    - secure_pubspec_urls
+    - sized_box_for_whitespace
+    # - sized_box_shrink_expand # not yet tested
     - slash_for_doc_comments
-    # - sort_child_properties_last # not yet tested
+    - sort_child_properties_last
     - sort_constructors_first
     # - sort_pub_dependencies # prevents separating pinned transitive dependencies
     - sort_unnamed_constructors_first
@@ -194,36 +191,46 @@ linter:
     - tighten_type_of_initializing_formals
     # - type_annotate_public_apis # subset of always_specify_types
     - type_init_formals
-    # - unawaited_futures # too many false positives
-    # - unnecessary_await_in_return # not yet tested
+    # - unawaited_futures # too many false positives, especially with the way AnimationController works
+    - unnecessary_await_in_return
     - unnecessary_brace_in_string_interps
     - unnecessary_const
+    - unnecessary_constructor_name
     # - unnecessary_final # conflicts with prefer_final_locals
     - unnecessary_getters_setters
     # - unnecessary_lambdas # has false positives: https://github.com/dart-lang/linter/issues/498
+    - unnecessary_late
     - unnecessary_new
     - unnecessary_null_aware_assignments
-    # - unnecessary_null_checks # not yet tested
+    - unnecessary_null_checks
     - unnecessary_null_in_if_null_operators
     - unnecessary_nullable_for_final_variable_declarations
     - unnecessary_overrides
     - unnecessary_parenthesis
-    # - unnecessary_raw_strings # not yet tested
+    # - unnecessary_raw_strings # what's "necessary" is a matter of opinion; consistency across strings can help readability more than this lint
     - unnecessary_statements
     - unnecessary_string_escapes
     - unnecessary_string_interpolations
     - unnecessary_this
     - unrelated_type_equality_checks
-    # - unsafe_html # not yet tested
+    - unsafe_html
+    # - use_build_context_synchronously
+    # - use_colored_box # not yet tested
+    # - use_decorated_box # not yet tested
+    # - use_enums # not yet tested
     - use_full_hex_values_for_flutter_colors
-    # - use_function_type_syntax_for_parameters # not yet tested
+    - use_function_type_syntax_for_parameters
+    - use_if_null_to_convert_nulls_to_bools
     - use_is_even_rather_than_modulo
-    # - use_key_in_widget_constructors # not yet tested
+    - use_key_in_widget_constructors
     - use_late_for_private_fields_and_variables
+    - use_named_constants
     - use_raw_strings
     - use_rethrow_when_possible
-    # - use_setters_to_change_properties # not yet tested
+    - use_setters_to_change_properties
     # - use_string_buffers # has false positives: https://github.com/dart-lang/sdk/issues/34182
+    - use_super_parameters
+    - use_test_throws_matchers
     # - use_to_and_as_if_applicable # has false positives, so we prefer to catch this by code-review
     - valid_regexps
-    - void_checks
+    - void_checks

example/lib/main.dart

@@ -10,14 +10,15 @@ import 'package:flutter/services.dart';
 import 'package:wechat_camera_picker/wechat_camera_picker.dart';
 
 void main() {
-  runApp(MyApp());
+  runApp(const MyApp());
   SystemChrome.setSystemUIOverlayStyle(
     const SystemUiOverlayStyle(statusBarColor: Colors.transparent),
   );
 }
 
 class MyApp extends StatelessWidget {
-  // This widget is the root of your application.
+  const MyApp({super.key});
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
@@ -33,10 +34,10 @@ class MyApp extends StatelessWidget {
 }
 
 class MyHomePage extends StatefulWidget {
-  const MyHomePage({Key? key}) : super(key: key);
+  const MyHomePage({super.key});
 
   @override
-  _MyHomePageState createState() => _MyHomePageState();
+  State<MyHomePage> createState() => _MyHomePageState();
 }
 
 class _MyHomePageState extends State<MyHomePage> {
@@ -47,16 +48,16 @@ class _MyHomePageState extends State<MyHomePage> {
     final Size size = MediaQuery.of(context).size;
     final double scale = MediaQuery.of(context).devicePixelRatio;
     try {
-      final AssetEntity? _entity = await CameraPicker.pickFromCamera(
+      final AssetEntity? result = await CameraPicker.pickFromCamera(
         context,
         pickerConfig: const CameraPickerConfig(enableRecording: true),
       );
-      if (_entity != null && entity != _entity) {
-        entity = _entity;
+      if (result != null && result != entity) {
+        entity = result;
         if (mounted) {
           setState(() {});
         }
-        data = await _entity.thumbnailDataWithSize(
+        data = await result.thumbnailDataWithSize(
           ThumbnailSize(
             (size.width * scale).toInt(),
             (size.height * scale).toInt(),

example/pubspec.yaml

@@ -1,11 +1,11 @@
 name: wechat_camera_picker_demo
 description: A new Flutter project.
-publish_to: 'none' # Remove this line if you wish to publish to pub.dev
-version: 3.1.0+9
+version: 3.2.0+10
+publish_to: none
 
 environment:
-  sdk: '>=2.14.0 <3.0.0'
-  flutter: '>=2.5.0'
+  sdk: '>=2.17.0 <3.0.0'
+  flutter: '>=3.0.0'
 
 dependencies:
   flutter: