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Since title field is considered as base field in Drupal 8, I opted hook_entity_base_field_info_alter to add validation to it. But when I look at that hook.

hook_entity_base_field_info_alter(&$fields, \Drupal\Core\Entity\EntityTypeInterface $entity_type)

It doesn't holds a $bundle argument. So I couldn't add a validation for title field of a particular node type. How can I override it to be node type specific?

2 Answers 2

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Base fields are by definition not bundle specific, you can't add something for a specific bundle in that hook.

However, what you can do is save it as a base field override. See how NodeTypeForm::save saves different default values and labels for base fields as base field overrides.

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You can check too node title validation https://www.drupal.org/project/node_title_validation

This module check unique titles, max & min characters and blacklist words.

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