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# Specify analysis options.
#
# For a list of lints, see: https://dart.dev/tools/linter-rules
# For guidelines on configuring static analysis, see:
# https://dart.dev/tools/analysis
#
# 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)
# - https://github.com/flutter/packages/blob/main/analysis_options.yaml
#
# This file contains the analysis options used for code in the flutter/flutter
# repository.
analyzer:
language:
strict-casts: true
strict-inference: true
errors:
# allow deprecated members (we do this because otherwise we have to annotate
# every member in every test, assert, etc, when we or the Dart SDK deprecates
# something (https://github.com/flutter/flutter/issues/143312)
deprecated_member_use: ignore
deprecated_member_use_from_same_package: ignore
formatter:
page_width: 100
linter:
rules:
# This list is derived from the list of all available lints located at
# https://github.com/dart-lang/sdk/blob/main/pkg/linter/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_specify_types # conflicts with omit_obvious_local_variable_types
# - always_use_package_imports # we do this commonly
- annotate_overrides
- annotate_redeclares
# - avoid_annotating_with_dynamic # conflicts with type_annotate_public_apis
- avoid_bool_literals_in_conditional_expressions
# - 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/4998
# - avoid_classes_with_only_static_members # we do this commonly for `abstract final class`es
- avoid_double_and_int_checks
- avoid_dynamic_calls
- avoid_empty_else
- avoid_equals_and_hash_code_on_mutable_classes
- avoid_escaping_inner_quotes
- avoid_field_initializers_in_const_classes
# TODO(kallentu): Remove this lint once the Dart SDK in Flutter is on version 3.13.
- avoid_final_parameters
- avoid_function_literals_in_foreach_calls
# - avoid_futureor_void # not yet tested
# - avoid_implementing_value_types # see https://github.com/dart-lang/linter/issues/4558
- avoid_init_to_null
- avoid_js_rounded_ints
# - avoid_multiple_declarations_per_line # seems to be a stylistic choice we don't subscribe to
# - 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
- avoid_relative_lib_imports
- avoid_renaming_method_parameters
- avoid_return_types_on_setters
- avoid_returning_null_for_void
# - 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
- avoid_types_as_parameter_names
# - avoid_types_on_closure_parameters # not yet tested
- avoid_unnecessary_containers
- avoid_unused_constructor_parameters
- avoid_void_async
# - 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 # doesn't match the typical style of this repo
- cast_nullable_to_non_nullable
# - close_sinks # not reliable enough
- collection_methods_unrelated_type
- combinators_ordering
# - comment_references # blocked on https://github.com/dart-lang/sdk/issues/64540
- conditional_uri_does_not_exist
# - 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
- dangling_library_doc_comments
- depend_on_referenced_packages
- deprecated_consistency
# - deprecated_member_use_from_same_package # we allow self-references to deprecated members
# - diagnostic_describe_all_properties # enabled only at the framework level (packages/flutter/lib)
- directives_ordering
# - discarded_futures # too many false positives, similar to unawaited_futures
# - do_not_use_environment # there are appropriate times to use the environment, especially in our tests and build logic
# - document_ignores # not yet tested
- empty_catches
- empty_constructor_bodies
- empty_statements
- eol_at_end_of_file
- exhaustive_cases
- file_names
- flutter_style_todos
- hash_and_equals
- implementation_imports
- implicit_call_tearoffs
- implicit_reopen
- invalid_case_patterns
- invalid_runtime_check_with_js_interop_types
# - join_return_with_assignment # not required by flutter style
- leading_newlines_in_multiline_strings
- library_annotations
- library_names
- library_prefixes
- library_private_types_in_public_api
# - lines_longer_than_80_chars # not required by flutter style
- literal_only_boolean_expressions
# - matching_super_parameters # blocked on https://github.com/dart-lang/language/issues/2509
- missing_code_block_language_in_doc_comment
- missing_whitespace_between_adjacent_strings
- no_adjacent_strings_in_list
- no_default_cases
- no_duplicate_case_values
- no_leading_underscores_for_library_prefixes
- no_leading_underscores_for_local_identifiers
- no_literal_bool_comparisons
- no_logic_in_create_state
- no_raw_types
# - no_runtimeType_toString # ok in tests; we enable this only in packages/
- no_self_assignments
- no_wildcard_variable_uses
- non_constant_identifier_names
- noop_primitive_operations
- null_check_on_nullable_type_parameter
- null_closures
# - omit_local_variable_types # superset of omit_obvious_local_variable_types
- omit_obvious_local_variable_types # not yet tested
# - omit_obvious_property_types # conflicts with type_annotate_public_apis
# - one_member_abstracts # too many false positives
- only_throw_errors # this does get disabled in a few places where we have legacy code that uses strings et al
- overridden_fields
- 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 required by flutter style
- 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 # far too many false positives
- prefer_contains
# - prefer_double_quotes # opposite of prefer_single_quotes
# - prefer_expression_function_bodies # conflicts with ./docs/contributing/Style-guide-for-Flutter-repo.md#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
- prefer_generic_function_type_aliases
- prefer_if_elements_to_conditional_expressions
- prefer_if_null_operators
- prefer_initializing_formals
- prefer_inlined_adds
# - prefer_int_literals # conflicts with ./docs/contributing/Style-guide-for-Flutter-repo.md#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
# - 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
# - public_member_api_docs # enabled on a case-by-case basis; see e.g. packages/analysis_options.yaml
- recursive_getters
# - require_trailing_commas # would be nice, but requires a lot of manual work: 10,000+ code locations would need to be reformatted by hand after bulk fix is applied
- secure_pubspec_urls
- sized_box_for_whitespace
- sized_box_shrink_expand
- slash_for_doc_comments
- sort_child_properties_last
- sort_constructors_first
# - sort_pub_dependencies # prevents separating pinned transitive dependencies
- sort_unnamed_constructors_first
- specify_nonobvious_local_variable_types
- specify_nonobvious_property_types
- strict_top_level_inference
- test_types_in_equals
- throw_in_finally
- tighten_type_of_initializing_formals
- type_annotate_public_apis
- type_init_formals
- type_literal_in_constant_pattern
- unawaited_futures
# - unintended_html_in_doc_comment # blocked on https://github.com/dart-lang/linter/issues/5065
# - unnecessary_async # not yet tested
- unnecessary_await_in_return
- unnecessary_brace_in_string_interps
- unnecessary_breaks
- unnecessary_const
- unnecessary_constructor_name
# - unnecessary_final # conflicts with prefer_final_locals
- unnecessary_getters_setters
# - unnecessary_ignore # Disabled by default to simplify migrations; should be periodically enabled locally to clean up offenders
# - unnecessary_lambdas # has false positives: https://github.com/dart-lang/linter/issues/498
- unnecessary_late
- unnecessary_library_directive
# - unnecessary_library_name # blocked on https://github.com/dart-lang/dartdoc/issues/3882
- unnecessary_new
- unnecessary_null_aware_assignments
- unnecessary_null_aware_operator_on_extension_on_nullable
- unnecessary_null_checks
- unnecessary_null_in_if_null_operators
- unnecessary_nullable_for_final_variable_declarations
- unnecessary_overrides
- unnecessary_parenthesis
# - 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
- unnecessary_to_list_in_spreads
- unnecessary_underscores
- unreachable_from_main
- unrelated_type_equality_checks
# - unsafe_variance # not yet tested
- use_build_context_synchronously
- use_colored_box
# - use_decorated_box # leads to bugs: DecoratedBox and Container are not equivalent (Container inserts extra padding)
- use_enums
- use_full_hex_values_for_flutter_colors
- use_function_type_syntax_for_parameters
- use_is_even_rather_than_modulo
- 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
# - use_string_buffers # has false positives: https://github.com/dart-lang/sdk/issues/34182
- use_string_in_part_of_directives
- 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
- use_truncating_division
- valid_regexps
# TODO(kallentu): Remove this lint once the Dart SDK in Flutter is on version 3.13.
- var_with_no_type_annotation
- void_checks