facebook pixelDART Static Code Analysis Rules
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Dart rules

Codiga provides multiple set of rules for 12+ languages. Below we provide a link and a description for all the rules supported by our platform. Note that not all the rules are being listed and described below.

      ALWAYS_DECLARE_RETURN_TYPES

      Code style
      High

      Method should have return type

      always_specify_types

      Code style
      Minor

      Always specify types

      ARGUMENT_TYPE_NOT_ASSIGNABLE

      Code style
      Medium

      Invalid assignments

      ASSET_DOES_NOT_EXIST

      Code style
      Medium

      Asset does not exists

      AVOID_BOOL_LITERALS_IN_CONDITIONAL_EXPRESSIONS

      Code style
      Minor

      Avoid bool literals in condition

      AVOID_CLASSES_WITH_ONLY_STATIC_MEMBERS

      Code style
      Minor

      Avoid defining a class that contains only static members.

      AVOID_ESCAPING_INNER_QUOTES

      Code style
      Minor

      Avoid escaping inner quotes by converting surrounding quotes.

      AVOID_FUNCTION_LITERALS_IN_FOREACH_CALLS

      Code style
      Minor

      Avoid using `forEach` with a function literal.

      avoid_init_to_null

      Code style
      Minor

      Don't explicitly initialize variables to null.

      AVOID_POSITIONAL_BOOLEAN_PARAMETERS

      Code style
      Minor

      Avoid positional boolean parameters.

      AVOID_PRINT

      Code style
      High

      Avoid `print` calls in production code.

      AVOID_REDUNDANT_ARGUMENT_VALUES

      Code style
      Minor

      Avoid redundant argument values.

      AVOID_RETURN_TYPES_ON_SETTERS

      Code style
      Minor

      Avoid return types on setters.

      AVOID_UNNECESSARY_CONTAINERS

      Code style
      Minor

      Avoid unnecessary containers.

      AVOID_VOID_ASYNC

      Code style
      Minor

      Avoid async functions that return void.

      AVOID_WEB_LIBRARIES_IN_FLUTTER

      Code style
      Minor

      Avoid using web-only libraries outside Flutter web plugin packages.

      AWAIT_ONLY_FUTURES

      Code style
      Minor

      await' should only apply to futures

      BODY_MIGHT_COMPLETE_NORMALLY

      Code style
      Medium

      The body might complete normally

      CAMEL_CASE_TYPES

      Code style
      Minor

      Name types using UpperCamelCase.

      CAST_NULLABLE_TO_NON_NULLABLE

      Code style
      Minor

      Don't cast a nullable value to a non nullable type.

      CAST_TO_NON_TYPE

      Code style
      Medium

      The name isn't a type

      close_sinks

      Code style
      Minor

      Close instances of `dart.core.Sink`.\n

      CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE

      Code style
      Medium

      Const variables must be initialized with a constant value.

      CONST_WITH_NON_CONSTANT_ARGUMENT

      Code style
      Medium

      Arguments of a constant creation must be constant expressions.

      COULD_NOT_INFER

      Code style
      Medium

      Cannot infer type

      CREATION_WITH_NON_TYPE

      Code style
      Medium

      The name 'BubbleStyle' isn't a class.\n

      DEAD_CODE

      Code style
      Minor

      Dead code.

      DEAD_CODE_ON_CATCH_SUBTYPE

      Code style
      Minor

      Dead code on catch subtype.

      DEAD_NULL_AWARE_EXPRESSION

      Code style
      Minor

      The left operand can't be null.

      DEFAULT_LIST_CONSTRUCTOR

      Code style
      Medium

      The default 'List' constructor isn't available when null safety is enabled.

      DEPEND_ON_REFERENCED_PACKAGES

      Code style
      Minor

      Depend on referenced packages.

      DEPRECATED_MEMBER_USE

      Code style
      Minor

      Member is deprecated and shouldn't be used. This property is no longer used

      DIRECTIVES_ORDERING

      Code style
      Minor

      Import ordering

      DUPLICATE_IMPORT

      Code style
      Minor

      Duplicate import.

      EMPTY_CATCHES

      Code style
      Minor

      Avoid empty catch blocks.

      empty_constructor_bodies

      Code style
      Minor

      Use `;` instead of `{}` for empty constructor bodies.

      empty_statements

      Code style
      Minor

      Detect empty statements (dead code)

      EOL_AT_END_OF_FILE

      Code style
      Minor

      Put a single newline at end of file.

      EXPECTED_TOKEN

      Code style
      Medium

      Expected to find '['.

      EXTENDS_NON_CLASS

      Code style
      Medium

      Classes can only extend other classes.

      EXTRA_POSITIONAL_ARGUMENTS

      Code style
      Medium

      Too many positional arguments.

      FILE_NAMES

      Code style
      Minor

      Name source files using `lowercase\_with\_underscores`.

      GETTER_NOT_SUBTYPE_SETTER_TYPES

      Code style
      Medium

      Invalid return type

      HASH_AND_EQUALS

      Code style
      Minor

      Override `hashCode` if overriding `==`

      ILLEGAL_ASSIGNMENT_TO_NON_ASSIGNABLE

      Code style
      High

      Illegal assignment to non-assignable expression.

      implementation_imports

      Code style
      Minor

      Don't import implementation files from another package.

      IMPLEMENTS_NON_CLASS

      Code style
      Medium

      Classes and mixins can only implement other classes and mixins.

      IMPORT_OF_LEGACY_LIBRARY_INTO_NULL_SAFE

      Code style
      Minor

      Legacy library

      INCLUDE_FILE_NOT_FOUND

      Code style
      Medium

      Include file not found

      INVALID_ANNOTATION_TARGET

      Code style
      Minor

      Invalid annotation target

      INVALID_ASSIGNMENT

      Code style
      Medium

      Invalid assignments

      INVALID_CONSTANT

      Code style
      Medium

      Invalid constant value

      INVALID_NULL_AWARE_OPERATOR

      Code style
      Minor

      The receiver can't be null because of short-circuiting

      INVALID_OVERRIDE

      Code style
      Medium

      Invalid override

      INVALID_USE_OF_PROTECTED_MEMBER

      Code style
      Minor

      Invalid use of protected members

      INVARIANT_BOOLEANS

      Code style
      Minor

      Conditions should not unconditionally evaluate to `true` or to `false`.

      JOIN_RETURN_WITH_ASSIGNMENT

      Code style
      Minor

      Join return statement with assignment when possible.

      LIBRARY_PREFIXES

      Code style
      Minor

      Use `lowercase\_with\_underscores` when specifying a library prefix.

      LIST_ELEMENT_TYPE_NOT_ASSIGNABLE

      Code style
      Medium

      List element type not assignable

      MISSING_ASSIGNABLE_SELECTOR

      Code style
      High

      Missing selector

      MISSING_DEFAULT_VALUE_FOR_PARAMETER

      Code style
      Medium

      Missing default value for parameter

      MISSING_ENUM_CONSTANT_IN_SWITCH

      Code style
      Minor

      Missing case clause for 'null'.

      MISSING_IDENTIFIER

      Code style
      Medium

      Expected an identifier.

      MISSING_REQUIRED_ARGUMENT

      Code style
      High

      Missing required argument

      MISSING_REQUIRED_PARAM

      Code style
      Medium

      Missing required parameters

      MISSING_RETURN

      Code style
      Minor

      Missing return value

      MIXIN_OF_NON_CLASS

      Code style
      Medium

      Classes can only mix in mixins and classes.

      MIXIN_WITH_NON_CLASS_SUPERCLASS

      Code style
      Medium

      Mixin can only be applied to class.

      MUST_BE_IMMUTABLE

      Code style
      Minor

      Must be immutable

      MUST_CALL_SUPER

      Code style
      Minor

      This method overrides a method annotated as '@mustCallSuper' in 'State'

      NEW_WITH_UNDEFINED_CONSTRUCTOR_DEFAULT

      Code style
      Medium

      The class doesn't have a default constructor.

      NO_DEFAULT_SUPER_CONSTRUCTOR

      Code style
      High

      No default super constructor

      NON_ABSTRACT_CLASS_INHERITS_ABSTRACT_MEMBER

      Code style
      Medium

      Missing concrete implementations of methods

      NON_BOOL_CONDITION

      Code style
      Medium

      Conditions must have a static type of 'bool'

      NON_CONSTANT_CASE_EXPRESSION

      Code style
      Medium

      Case expressions must be constant

      NON_CONSTANT_DEFAULT_VALUE

      Code style
      Medium

      The default value of an optional parameter must be constant

      non_constant_identifier_names

      Code style
      Minor

      Name non-constant identifiers using lowerCamelCase

      NON_CONSTANT_LIST_ELEMENT

      Code style
      Medium

      The values in a const list literal must be constants

      NON_CONSTANT_MAP_VALUE

      Code style
      Medium

      The values in a const map literal must be constant

      NON_TYPE_AS_TYPE_ARGUMENT

      Code style
      Medium

      The name isn't a type so it can't be used as a type argument

      NON_TYPE_IN_CATCH_CLAUSE

      Code style
      Medium

      The name isn't a type and can't be used in an on-catch clause.

      NOOP_PRIMITIVE_OPERATIONS

      Code style
      Minor

      Noop primitive operations.

      NOT_ASSIGNED_POTENTIALLY_NON_NULLABLE_LOCAL_VARIABLE

      Code style
      Medium

      The non-nullable local variable must be assigned before it can be used.

      NOT_INITIALIZED_NON_NULLABLE_INSTANCE_FIELD

      Code style
      Medium

      Non-nullable instance field must be initialized.

      NOT_INITIALIZED_NON_NULLABLE_VARIABLE

      Code style
      Medium

      The non-nullable variable must be initialized.

      NULLABLE_TYPE_IN_CATCH_CLAUSE

      Code style
      Minor

      A potentially nullable type can't be used in an 'on' clause because it isn't valid to throw a nullable expression.

      OVERRIDDEN_FIELDS

      Code style
      Minor

      Don't override fields.

      OVERRIDE_ON_NON_OVERRIDING_MEMBER

      Code style
      Minor

      The field doesn't override an inherited getter or setter.

      POSITIONAL_AFTER_NAMED_ARGUMENT

      Code style
      Medium

      Positional arguments must occur before named arguments.

      PREFER_CONST_CONSTRUCTORS

      Code style
      Minor

      Prefer const with constant constructors.

      PREFER_CONST_CONSTRUCTORS_IN_IMMUTABLES

      Code style
      Minor

      Prefer declaring const constructors on `@immutable` classes

      PREFER_CONST_DECLARATIONS

      Code style
      High

      Prefer const over final for declarations

      PREFER_CONST_LITERALS_TO_CREATE_IMMUTABLES

      Code style
      Minor

      Prefer const literals as parameters of constructors on @immutable classes.

      PREFER_FINAL_IN_FOR_EACH

      Code style
      Minor

      Prefer final in for-each loop variable if reference is not reassigned.

      PREFER_FINAL_LOCALS

      Code style
      High

      Prefer final for variable declarations if they are not reassigned.

      PREFER_IF_ELEMENTS_TO_CONDITIONAL_EXPRESSIONS

      Code style
      Minor

      Prefer if elements to conditional expressions where possible.

      PREFER_IF_NULL_OPERATORS

      Code style
      Minor

      Prefer using if null operators.

      PREFER_INITIALIZING_FORMALS

      Code style
      Minor

      Use initializing formals when possible.

      PREFER_INTERPOLATION_TO_COMPOSE_STRINGS

      Code style
      Minor

      Use interpolation to compose strings and values.

      PREFER_IS_EMPTY

      Code style
      Minor

      Use isEmpty instead of length\n

      PREFER_IS_NOT_EMPTY

      Code style
      Minor

      Use `isNotEmpty` for Iterables and Maps.

      PREFER_NULL_AWARE_METHOD_CALLS

      Code style
      Minor

      Prefer null aware method calls.

      PREFER_TYPING_UNINITIALIZED_VARIABLES

      Code style
      Minor

      Prefer typing uninitialized variables and fields.

      REDIRECT_TO_NON_CLASS

      Code style
      High

      Name isn't a type and can't be used in a redirected constructor.

      REQUIRE_TRAILING_COMMAS

      Code style
      Minor

      Missing a required trailing comma.

      RETURN_OF_INVALID_TYPE

      Code style
      Medium

      Invalid return type

      RETURN_OF_INVALID_TYPE_FROM_CLOSURE

      Code style
      Medium

      Invalid return type from closure

      SIZED_BOX_FOR_WHITESPACE

      Code style
      Minor

      SizedBox for whitespace.

      SORT_CHILD_PROPERTIES_LAST

      Code style
      High

      Sort child properties last in widget instance creations.

      SORT_PUB_DEPENDENCIES

      Code style
      Minor

      Sort pub dependencies.

      TYPE_ANNOTATE_PUBLIC_APIS

      Code style
      High

      Type annotate public APIs.

      TYPE_ARGUMENT_NOT_MATCHING_BOUNDS

      Code style
      High

      Type arguments do not match bounds

      TYPE_TEST_WITH_UNDEFINED_NAME

      Code style
      Medium

      Undefined name

      UNCHECKED_USE_OF_NULLABLE_VALUE

      Code style
      Medium

      Method can't be unconditionally invoked because the receiver can be 'null'.

      UNDEFINED_CONSTRUCTOR_IN_INITIALIZER

      Code style
      Medium

      Undefined constructor

      UNDEFINED_GETTER

      Code style
      Medium

      Undefined getter

      UNDEFINED_NAMED_PARAMETER

      Code style
      Medium

      Named parameter undefined

      UNDEFINED_OPERATOR

      Code style
      High

      Undefined operator

      UNDEFINED_SETTER

      Code style
      Medium

      Undefined setter

      UNDEFINED_SUPER_MEMBER

      Code style
      Medium

      Undefined super member

      unnecessary_brace_in_string_interps

      Code style
      Minor

      Avoid using braces in interpolation when not needed.

      UNNECESSARY_CAST

      Code style
      Minor

      Unnecessary cast.

      UNNECESSARY_NEW

      Code style
      Minor

      Unnecessary new keyword.

      UNNECESSARY_NON_NULL_ASSERTION

      Code style
      Medium

      Uneccessary non null assertion

      UNNECESSARY_NULL_CHECKS

      Code style
      Minor

      Unnecessary null checks

      UNNECESSARY_NULL_COMPARISON

      Code style
      Minor

      The operand can't be null

      UNNECESSARY_PARENTHESIS

      Code style
      Minor

      Unnecessary parenthesis

      unnecessary_statements

      Code style
      Minor

      Avoid using unnecessary statements

      UNNECESSARY_STRING_INTERPOLATIONS

      Code style
      Minor

      Unnecessary string interpolation

      UNNECESSARY_THIS

      Code style
      High

      Unecessary this

      UNSUPPORTED_OPERATOR

      Code style
      High

      The '===' operator is not supported

      UNUSED_CATCH_CLAUSE

      Code style
      Minor

      Unused catch clause

      UNUSED_CATCH_STACK

      Code style
      Minor

      Stack trace not used

      UNUSED_ELEMENT

      Code style
      Minor

      Unused element

      UNUSED_FIELD

      Code style
      Minor

      Unused fiel

      UNUSED_IMPORT

      Code style
      Minor

      Unused import

      UNUSED_LABEL

      Code style
      Minor

      Unused label

      UNUSED_LOCAL_VARIABLE

      Code style
      Minor

      Unused local variable

      URI_HAS_NOT_BEEN_GENERATED

      Code style
      Medium

      URI has not been generated

      USE_BUILD_CONTEXT_SYNCHRONOUSLY

      Code style
      Minor

      Use build context synchronuously

      USE_LATE_FOR_PRIVATE_FIELDS_AND_VARIABLES

      Code style
      Minor

      Use late for private members with non-nullable type.

      USE_NAMED_CONSTANTS

      Code style
      Minor

      Use named constants

      USE_OF_VOID_RESULT

      Code style
      High

      Use of void results

      USE_STRING_BUFFERS

      Code style
      Minor

      Use string buffers to compose strings

      ALWAYS_USE_PACKAGE_IMPORTS

      Best practice
      High

      Avoid relative imports.

      Learn more

      ANNOTATE_OVERRIDES

      Best practice
      Medium

      Annotate overridden members.

      Learn more

      AVOID_DYNAMIC_CALLS

      Best practice
      High

      Avoid method calls or property accesses on a "dynamic" target

      Learn more

      https://dart-lang.github.io/linter/lints/avoid_returning_null_for_void.html

      Best practice
      Critical

      Avoid returning null for void

      Learn more

      AVOID_RETURNING_NULL_FOR_VOID

      Safety
      High

      Avoid returning null for void

      Learn more

      CONST_CONSTRUCTOR_PARAM_TYPE_MISMATCH

      Error prone
      Medium

      Type mismatch in constructor parameter

      Learn more

      CONST_EVAL_THROWS_EXCEPTION

      Best practice
      High

      Eval throws exception.

      Learn more

      LEADING_NEWLINES_IN_MULTILINE_STRINGS

      Best practice
      Medium

      Start multiline strings with a newline.

      Learn more

      UNNECESSARY_IMPORT

      Best practice
      Minor

      Unnecessary import

      Learn more

      NOT_ENOUGH_POSITIONAL_ARGUMENTS

      Error prone
      High

      Incorrect number of arguments passed to function call

      Learn more

      UNNECESSARY_TYPE_CHECK

      Best practice
      Medium

      Unnecessary type check

      Learn more

      BODY_MIGHT_COMPLETE_NORMALLY_NULLABLE

      Best practice
      Medium

      The analyzer produces this diagnostic when a method or function can implicitly return null by falling off the end. While this is valid Dart code, it’s better for the return of null to be explicit.

      Learn more

      UNNECESSARY_DEV_DEPENDENCY

      Error prone
      Medium

      The dev dependency is unnecessary because there is also a normal dependency on that package.

      Learn more

      NULL_ARGUMENT_TO_NON_NULL_TYPE

      Safety
      High

      Function/method shouldn’t be called with a null argument for the non-nullable type argument.

      Learn more

      UNNECESSARY_QUESTION_MARK

      Best practice
      Medium

      The ‘?’ is unnecessary because the value is nullable without it.

      Learn more

      DUPLICATE_NAMED_ARGUMENT

      Error prone
      High

      The argument was already specified.

      Learn more

      NO_LEADING_UNDERSCORES_FOR_LOCAL_IDENTIFIERS

      Code style
      Medium

      Avoid leading underscores for local identifiers.

      Learn more

      PREFER_FINAL_FIELDS

      Best practice
      Medium

      Field could be final.

      Learn more

      PREFER_GENERIC_FUNCTION_TYPE_ALIASES

      Best practice
      Medium

      Prefer generic function type aliases.

      Learn more

      VARIABLE_TYPE_MISMATCH

      Error prone
      Critical

      Type mismatch in assignment

      AVOID_IMPLEMENTING_VALUE_TYPES

      Best practice
      Medium

      Don't implement classes that override `==`.

      Learn more

      AVOID_SETTERS_WITHOUT_GETTERS

      Design
      Medium

      Avoid setters without getters.

      Learn more

      CONSTANT_IDENTIFIER_NAMES

      Code style
      Medium

      Prefer using lowerCamelCase for constant names.

      Learn more

      UNNECESSARY_OVERRIDES

      Best practice
      Medium

      Don't override a method to do a super method invocation with the same parameters.

      Learn more

      DUPLICATE_DEFINITION

      Error prone
      Medium

      Name already defined.

      Learn more

      DIRECTIVE_AFTER_DECLARATION

      Code style
      Minor

      Directives must appear before any declarations.

      DUPLICATE_PART

      Best practice
      Medium

      The library already contains a part.

      EXTRA_POSITIONAL_ARGUMENTS_COULD_BE_NAMED

      Error prone
      Medium

      Too many positional arguments.

      Learn more

      FLUTTER_STYLE_TODOS

      Code style
      Minor

      Use Flutter TODO format.

      Learn more

      NO_LEADING_UNDERSCORES_FOR_LIBRARY_PREFIXES

      Code style
      Minor

      Avoid leading underscores for library prefixes.

      INVALID_FACTORY_NAME_NOT_A_CLASS

      Code style
      Minor

      The name of a factory constructor must be the same as the name of the immediately enclosing class.

      Learn more

      INVALID_LANGUAGE_VERSION_OVERRIDE

      Best practice
      Medium

      The language version override must be specified before any declaration or directive.

      Learn more

      INSTANCE_ACCESS_TO_STATIC_MEMBER

      Error prone
      High

      Static method can't be accessed through an instance.

      Learn more

      INVALID_RETURN_TYPE_FOR_CATCH_ERROR

      Design
      High

      Invalid return type value

      Learn more

      LIBRARY_PRIVATE_TYPES_IN_PUBLIC_API

      Design
      High

      Using library private types in public APIs

      Learn more

      UNRELATED_TYPE_EQUALITY_CHECKS

      Error prone
      High

      Equality operator `==` invocation with references of unrelated types

      Learn more

      USE_KEY_IN_WIDGET_CONSTRUCTORS

      Best practice
      High

      Use key in widget constructors.

      Learn more