I have been creating a lot of custom forms for purchase order creation and custom shipping methods, using Drupal 8's form API.
For the latest form, I needed to add an autocomplete field for user accounts that filtered by a specific role.
In the example below I only needed to show users with the role of 'Supplier'
Example:
$form['group']['field_user'] = array( '#type' => 'entity_autocomplete', '#title' => t('Add User'), '#description' => t('Example text goes here'), '#target_type' => 'user', '#selection_settings' => [ 'include_anonymous' => FALSE, 'filter' => [ 'role' => ['supplier'], ], ], );
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