test_fieldtype_boolean_emoji_normalizer.services.yml

services:
  serializer.normalizer.boolean.fieldtype.emoji:
    class: Drupal\test_fieldtype_boolean_emoji_normalizer\Normalizer\BooleanItemNormalizer
    tags:
      # The priority must be higher than serialization.normalizer.field_item.
      - { name: normalizer , priority: 1000 }