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For Flutter, to give more information about 'recommended approach'
# Uncomment this file to turn on linter warning
# Source: https://github.com/flutter/flutter/blob/master/analysis_options.yaml
# 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
#
# 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
#
# This file contains the analysis options used by Flutter tools, such as IntelliJ,
# Android Studio, and the `flutter analyze` command.
analyzer:
strong-mode:
implicit-casts: false
implicit-dynamic: false
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
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:
- "**/*.g.dart"
- "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/**"
linter:
rules:
# these rules are documented on and in the same order as
# the Dart Lint rules page to make maintenance easier
# https://github.com/dart-lang/linter/blob/master/example/all.yaml
- always_declare_return_types
- always_put_control_body_on_new_line
# - always_put_required_named_parameters_first # we prefer having parameters in the same order as fields https://github.com/flutter/flutter/issues/10219
- always_require_non_null_named_parameters
- always_specify_types
- 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_classes_with_only_static_members
# - avoid_double_and_int_checks # only useful when targeting JS runtime
- avoid_empty_else
- avoid_equals_and_hash_code_on_mutable_classes
# - avoid_field_initializers_in_const_classes
- avoid_function_literals_in_foreach_calls
# - avoid_implementing_value_types # not yet tested
- avoid_init_to_null
# - avoid_js_rounded_ints # only useful when targeting JS runtime
- avoid_null_checks_in_equality_operators
# - avoid_positional_boolean_parameters # not yet tested
# - avoid_print # not yet tested
# - 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_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_for_void
# - avoid_returning_this # there are plenty of valid reasons to return this
# - avoid_setters_without_getters # not yet tested
# - avoid_shadowing_type_parameters # not yet tested
- avoid_single_cascade_in_expression_statements
- avoid_slow_async_io
- avoid_types_as_parameter_names
# - avoid_types_on_closure_parameters # conflicts with always_specify_types
# - avoid_unnecessary_containers # not yet tested
- avoid_unused_constructor_parameters
- avoid_void_async
# - avoid_web_libraries_in_flutter # not yet tested
- await_only_futures
- camel_case_extensions
- camel_case_types
- cancel_subscriptions
# - cascade_invocations # not yet tested
# - close_sinks # not reliable enough
# - comment_references # blocked on https://github.com/flutter/flutter/issues/20765
# - 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 yet tested
# - diagnostic_describe_all_properties # not yet tested
- directives_ordering
- empty_catches
- empty_constructor_bodies
- empty_statements
# - file_names # not yet tested
- flutter_style_todos
- hash_and_equals
- implementation_imports
# - invariant_booleans # too many false positives: https://github.com/dart-lang/linter/issues/811
- iterable_contains_unrelated_type
# - join_return_with_assignment # not yet tested
- library_names
- library_prefixes
# - lines_longer_than_80_chars # not yet tested
- 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
- no_adjacent_strings_in_list
- no_duplicate_case_values
# - no_logic_in_create_state # not yet tested
# - no_runtimeType_toString # not yet tested
- non_constant_identifier_names
# - null_closures # not yet tested
# - 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
- package_prefixed_library_names
# - parameter_assignments # we do this commonly
- prefer_adjacent_string_concatenation
- prefer_asserts_in_initializer_lists
# - prefer_asserts_with_message # not yet tested
- 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 # not yet tested
- prefer_contains
# - prefer_double_quotes # opposite of prefer_single_quotes
- prefer_equal_for_default_values
# - prefer_expression_function_bodies # conflicts with https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#consider-using--for-short-functions-and-methods
- prefer_final_fields
- prefer_final_in_for_each
- prefer_final_locals
- prefer_for_elements_to_map_fromIterable
- prefer_foreach
# - prefer_function_declarations_over_variables # not yet tested
- 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_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_single_quotes
- prefer_spread_collections
- prefer_typing_uninitialized_variables
- prefer_void_to_null
# - provide_deprecation_message # not yet tested
# - public_member_api_docs # enabled on a case-by-case basis; see e.g. packages/analysis_options.yaml
- recursive_getters
- slash_for_doc_comments
# - sort_child_properties_last # not yet tested
# - sort_constructors_first
# - sort_pub_dependencies
- sort_unnamed_constructors_first
- test_types_in_equals
- throw_in_finally
# - 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
- unnecessary_brace_in_string_interps
- unnecessary_const
# - unnecessary_final # conflicts with prefer_final_locals
- unnecessary_getters_setters
# - unnecessary_lambdas # has false positives: https://github.com/dart-lang/linter/issues/498
- unnecessary_new
- unnecessary_null_aware_assignments
- unnecessary_null_in_if_null_operators
- unnecessary_overrides
- unnecessary_parenthesis
- unnecessary_statements
- unnecessary_string_interpolations
- unnecessary_this
- unrelated_type_equality_checks
# - unsafe_html # not yet tested
- use_full_hex_values_for_flutter_colors
# - use_function_type_syntax_for_parameters # not yet tested
# - use_key_in_widget_constructors # not yet tested
- use_late_for_private_fields_and_variables
- use_rethrow_when_possible
# - use_setters_to_change_properties # not yet tested
# - use_string_buffers # has false positives: https://github.com/dart-lang/sdk/issues/34182
# - use_to_and_as_if_applicable # has false positives, so we prefer to catch this by code-review
- valid_regexps
- void_checks
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