The expression return $query->andWhere(...ge::primaryKeySingle()) returns the type yii\db\ActiveQuery which is incompatible with the return type mandated by dameter\abstracts\interf...ranslatable::getTexts() of dameter\abstracts\models\BaseLanguageSetting[].
In the issue above, the returned value is violating the contract defined by the
mentioned interface.
Let's take a look at an example:
interfaceHasName{/** @return string */publicfunctiongetName();}className{public$name;}classUserimplementsHasName{/** @return string|Name */publicfunctiongetName(){returnnewName('foo');// This is a violation of the ``HasName`` interface// which only allows a string value to be returned.}}
In the issue above, the returned value is violating the contract defined by the mentioned interface.
Let's take a look at an example: