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psalm/docs/running_psalm/issues/MissingImmutableAnnotation.md
2020-03-20 19:13:56 -04:00

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# MissingImmutableAnnotation
Emitted when a class inheriting from an immutable interface or class does not also have a `@psalm-immutable` declaration
```php
<?php
/** @psalm-immutable */
interface SomethingImmutable {
public function someInteger() : int;
}
class MutableImplementation implements SomethingImmutable {
private int $counter = 0;
public function someInteger() : int {
return ++$this->counter;
}
}
```