Don't list a widget for a field type.

CustomWidget.php

  public static function isApplicable(FieldDefinitionInterface $field_definition) {
    if (isset($field_definition->getDisplayOptions('form')['type'])) {
      return $field_definition->getDisplayOptions('form')['type'] == 'slot_content_weights';
    }

    return FALSE;
  }

Issue:

You want to create a custom widget for a field but it should not be available to all fields of this type.

Solution:

Use the `isApplicable` method to restrict it to this field only.

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