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avoid-unrelated-type-assertions

added in: 1.6.0
⚙️

Warns about unrelated usages of is operator.

⚙️ Config

Set ignore-mixins (default is false) to exclude mixins from the rule checks.

dart_code_metrics:
...
rules:
- avoid-unrelated-type-assertions:
ignore-mixins: false

Example

❌ Bad:

class Animal {}

class NotAnimal {}

class HomeAnimal extends Animal {}

class Example {
final regularString = '';
final myList = <int>[1, 2, 3];

final Animal animal = Animal();

void main() {
final result = regularString is int; // LINT
final result2 = myList is List<String>; // LINT

final result3 = animal is NotAnimal; // LINT
}

void patterns() {
final animal = Animal();

if (animal case HomeAnimal result) {}
if (animal case HomeAnimal()) {}
if (animal case NotAnimal result) {} // LINT
if (animal case NotAnimal()) {} // LINT
}
}

✅ Good:

class Animal {}

class HomeAnimal extends Animal {}

class Example {
final regularString = '';
final myList = <int>[1, 2, 3];

final Animal animal = Animal();

void main() {
final result = regularString is String;
final result2 = myList is List<int>;

final result3 = animal is Object;
}

void patterns() {
final animal = Animal();

if (animal case HomeAnimal result) {}
if (animal case HomeAnimal()) {}
}
}