2 methods override ContentEntityBase::baseFieldDefinitions()

EditorialContentEntityBase::baseFieldDefinitions in core/lib/Drupal/Core/Entity/EditorialContentEntityBase.php
Provides base field definitions for an entity type.
RevisionableContentEntityBase::baseFieldDefinitions in core/lib/Drupal/Core/Entity/RevisionableContentEntityBase.php
Provides base field definitions for an entity type.

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