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 four similar analysis options files in the flutter repos:
#   - 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.
#
# The flutter/plugins repo contains a copy of this file, which should be kept
# in sync with this file.

analyzer:
    language:
        enableSuperMixins: true
    strong-mode:
        implicit-dynamic: true
    errors:
        # treat missing required parameters as a warning (not a hint)
        missing_required_param: error
        # treat missing returns as a warning (not a hint)
        missing_return: error
        # allow having TODOs in the code
        todo: ignore

    exclude:
        - 'bin/cache/**'
        - 'flutter/**'
        # 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/stock_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
        # - avoid_bool_literals_in_conditional_expressions # not yet tested
        # - avoid_catches_without_on_clauses # we do this commonly
        # - avoid_catching_errors # we do this commonly
#        - avoid_classes_with_only_static_members
        - avoid_empty_else
        - avoid_function_literals_in_foreach_calls
        - avoid_init_to_null
        - avoid_null_checks_in_equality_operators
        # - avoid_positional_boolean_parameters # not yet tested
        # - avoid_private_typedef_functions # we prefer having typedef (discussion in https://github.com/flutter/flutter/pull/16356)
        - avoid_relative_lib_imports
        - avoid_renaming_method_parameters
        - avoid_return_types_on_setters
        # - avoid_returning_null # we do this commonly
        # - avoid_returning_this # https://github.com/dart-lang/linter/issues/842
        # - avoid_setters_without_getters # not yet tested
        # - avoid_single_cascade_in_expression_statements # not yet tested
        - avoid_slow_async_io
        # - avoid_types_as_parameter_names # https://github.com/dart-lang/linter/pull/954/files
        # - avoid_types_on_closure_parameters # conflicts with always_specify_types
        # - avoid_unused_constructor_parameters # https://github.com/dart-lang/linter/pull/847
        - await_only_futures
        - camel_case_types
        - cancel_subscriptions
        # - cascade_invocations # not yet tested
        # - close_sinks # https://github.com/flutter/flutter/issues/5789
        # - comment_references # blocked on https://github.com/dart-lang/dartdoc/issues/1153
        # - constant_identifier_names # https://github.com/dart-lang/linter/issues/204
        - control_flow_in_finally
        - directives_ordering
        - empty_catches
        - empty_constructor_bodies
        - empty_statements
        - hash_and_equals
        - implementation_imports
        # - invariant_booleans # https://github.com/flutter/flutter/issues/5790
        - iterable_contains_unrelated_type
        # - join_return_with_assignment # not yet tested
        - library_names
        - library_prefixes
        - list_remove_unrelated_type
        # - literal_only_boolean_expressions # https://github.com/flutter/flutter/issues/5791
        - no_adjacent_strings_in_list
        - no_duplicate_case_values
        - non_constant_identifier_names
        # - 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_bool_in_asserts
        - 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_equal_for_default_values # not yet tested
        # - 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_locals
        - prefer_foreach
        # - prefer_function_declarations_over_variables # not yet tested
        - prefer_initializing_formals
        # - prefer_interpolation_to_compose_strings # not yet tested
        - prefer_is_empty
        - prefer_is_not_empty
        - prefer_single_quotes
        - prefer_typing_uninitialized_variables
        - recursive_getters
        - slash_for_doc_comments
        # - sort_constructors_first
        - sort_unnamed_constructors_first
        - super_goes_last
        - test_types_in_equals
        - throw_in_finally
        # - type_annotate_public_apis # subset of always_specify_types
        - type_init_formals
        # - unawaited_futures # https://github.com/flutter/flutter/issues/5793
        - unnecessary_brace_in_string_interps
        - unnecessary_getters_setters
        # - unnecessary_lambdas # https://github.com/dart-lang/linter/issues/498
        - unnecessary_null_aware_assignments
        - unnecessary_null_in_if_null_operators
        - unnecessary_overrides
        # - unnecessary_parenthesis
        # - unnecessary_statements # not yet tested
        - unnecessary_this
        - unnecessary_new
        - unnecessary_const
        - unrelated_type_equality_checks
        - use_rethrow_when_possible
        # - use_setters_to_change_properties # not yet tested
        # - use_string_buffers # https://github.com/dart-lang/linter/pull/664
        # - use_to_and_as_if_applicable # has false positives, so we prefer to catch this by code-review
        - valid_regexps