rules.md

Lint set contents

Core lint rules

Lint Rules	Description	Fix
avoid_empty_else	Avoid empty statements in else clauses.	✅
avoid_relative_lib_imports	Avoid relative imports for files in lib/.	✅
avoid_shadowing_type_parameters	Avoid shadowing type parameters.
avoid_types_as_parameter_names	Avoid types as parameter names.	✅
await_only_futures	Await only futures.	✅
camel_case_extensions	Name extensions using UpperCamelCase.
camel_case_types	Name types using UpperCamelCase.
collection_methods_unrelated_type	Invocation of various collection methods with arguments of unrelated types.
curly_braces_in_flow_control_structures	DO use curly braces for all flow control structures.	✅
dangling_library_doc_comments	Attach library doc comments to library directives.	✅
depend_on_referenced_packages	Depend on referenced packages.
empty_catches	Avoid empty catch blocks.	✅
file_names	Name source files using lowercase_with_underscores.
hash_and_equals	Always override hashCode if overriding ==.	✅
implicit_call_tearoffs	Explicitly tear-off call methods when using an object as a Function.	✅
library_annotations	Attach library annotations to library directives.	✅
no_duplicate_case_values	Don't use more than one case with same value.	✅
no_wildcard_variable_uses	Don't use wildcard parameters or variables.
non_constant_identifier_names	Name non-constant identifiers using lowerCamelCase.	✅
null_check_on_nullable_type_parameter	Don't use null check on a potentially nullable type parameter.	✅
prefer_generic_function_type_aliases	Prefer generic function type aliases.	✅
prefer_is_empty	Use isEmpty for Iterables and Maps.	✅
prefer_is_not_empty	Use isNotEmpty for Iterables and Maps.	✅
prefer_iterable_whereType	Prefer to use whereType on iterable.	✅
prefer_typing_uninitialized_variables	Prefer typing uninitialized variables and fields.	✅
provide_deprecation_message	Provide a deprecation message, via @Deprecated("message").
secure_pubspec_urls	Use secure urls in pubspec.yaml.
type_literal_in_constant_pattern	Don't use constant patterns with type literals.	✅
unnecessary_overrides	Don't override a method to do a super method invocation with the same parameters.	✅
unrelated_type_equality_checks	Equality operator == invocation with references of unrelated types.
use_string_in_part_of_directives	Use string in part of directives.	✅
valid_regexps	Use valid regular expression syntax.
void_checks	Don't assign to void.

Recommended lint rules

Lint Rules	Description	Fix
annotate_overrides	Annotate overridden members.	✅
avoid_function_literals_in_foreach_calls	Avoid using forEach with a function literal.	✅
avoid_init_to_null	Don't explicitly initialize variables to null.	✅
avoid_null_checks_in_equality_operators	Don't check for null in custom == operators.	✅
avoid_renaming_method_parameters	Don't rename parameters of overridden methods.	✅
avoid_return_types_on_setters	Avoid return types on setters.	✅
avoid_returning_null_for_void	Avoid returning null for void.	✅
avoid_single_cascade_in_expression_statements	Avoid single cascade in expression statements.	✅
constant_identifier_names	Prefer using lowerCamelCase for constant names.	✅
control_flow_in_finally	Avoid control flow in finally blocks.
empty_constructor_bodies	Use ; instead of {} for empty constructor bodies.	✅
empty_statements	Avoid empty statements.	✅
exhaustive_cases	Define case clauses for all constants in enum-like classes.	✅
implementation_imports	Don't import implementation files from another package.
invalid_runtime_check_with_js_interop_types	Avoid runtime type tests with JS interop types where the result may not

be platform-consistent. |  |

| library_prefixes | Use lowercase_with_underscores when specifying a library prefix. | | | library_private_types_in_public_api | Avoid using private types in public APIs. | | | no_leading_underscores_for_library_prefixes | Avoid leading underscores for library prefixes. | ✅ | | no_leading_underscores_for_local_identifiers | Avoid leading underscores for local identifiers. | ✅ | | null_closures | Do not pass null as an argument where a closure is expected. | ✅ | | overridden_fields | Don't override fields. | | | package_names | Use lowercase_with_underscores for package names. | | | prefer_adjacent_string_concatenation | Use adjacent strings to concatenate string literals. | ✅ | | prefer_collection_literals | Use collection literals when possible. | ✅ | | prefer_conditional_assignment | Prefer using ??= over testing for null. | ✅ | | prefer_contains | Use contains for List and String instances. | ✅ | | prefer_final_fields | Private field could be final. | ✅ | | prefer_for_elements_to_map_fromIterable | Prefer for elements when building maps from iterables. | ✅ | | prefer_function_declarations_over_variables | Use a function declaration to bind a function to a name. | ✅ | | prefer_if_null_operators | Prefer using ?? operators. | ✅ | | prefer_initializing_formals | Use initializing formals when possible. | ✅ | | prefer_inlined_adds | Inline list item declarations where possible. | ✅ | | prefer_interpolation_to_compose_strings | Use interpolation to compose strings and values. | ✅ | | prefer_is_not_operator | Prefer is! operator. | ✅ | | prefer_null_aware_operators | Prefer using null-aware operators. | ✅ | | prefer_spread_collections | Use spread collections when possible. | ✅ | | recursive_getters | Property getter recursively returns itself. | | | slash_for_doc_comments | Prefer using /// for doc comments. | ✅ | | type_init_formals | Don't type annotate initializing formals. | ✅ | | unnecessary_brace_in_string_interps | Avoid using braces in interpolation when not needed. | ✅ | | unnecessary_const | Avoid const keyword. | ✅ | | unnecessary_constructor_name | Unnecessary .new constructor name. | ✅ | | unnecessary_getters_setters | Avoid wrapping fields in getters and setters just to be "safe". | ✅ | | unnecessary_late | Don't specify the late modifier when it is not needed. | ✅ | | unnecessary_library_name | Don't have a library name in a library declaration. | ✅ | | unnecessary_new | Unnecessary new keyword. | ✅ | | unnecessary_null_aware_assignments | Avoid null in null-aware assignment. | ✅ | | unnecessary_null_in_if_null_operators | Avoid using null in ?? operators. | ✅ | | unnecessary_nullable_for_final_variable_declarations | Use a non-nullable type for a final variable initialized with a non-nullable value. | ✅ | | unnecessary_string_escapes | Remove unnecessary backslashes in strings. | ✅ | | unnecessary_string_interpolations | Unnecessary string interpolation. | ✅ | | unnecessary_this | Don't access members with this unless avoiding shadowing. | ✅ | | unnecessary_to_list_in_spreads | Unnecessary toList() in spreads. | ✅ | | use_function_type_syntax_for_parameters | Use generic function type syntax for parameters. | ✅ | | use_rethrow_when_possible | Use rethrow to rethrow a caught exception. | ✅ | | use_super_parameters | Use super-initializer parameters where possible. | ✅ |