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asgrim avatar asgrim commented on June 21, 2024 1

@Parables this is template, which makes AggregateRoot a generic; implementors of AggregateRoot should fill in the type (which must be of type AggregateRootId), such that:

final class MyGreatAggregateRootId implements AggregateRootId { /* ... */ }

/** @template-implements AggregateRoot<MyGreatAggregateRootId> */
final class MyGreatAggregateRoot implements AggregateRoot

By doing this, you are telling static analysers (such as PHPStan, Psalm, etc.) that the AggregateRootIdType for your implementation is a MyGreatAggregateRootId (which is a specific implementation of `AggregateRootId).

You can read more about this sort of thing here: https://psalm.dev/docs/annotating_code/templated_annotations/#template-inheritance and https://phpstan.org/blog/generics-by-examples#specify-template-type-variable-of-a-generic-interface-when-implementing-it

from eventsauce.

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