improvements-2.x-dev/modules/improvements_title/improvements_title.services.yml

services:

  improvements_title.event_subscriber:
    class: Drupal\improvements_title\ImprovementsTitleEventSubscriber
    tags:
      - { name: event_subscriber }

  # Override title_resolver service
  title_resolver:
    class: Drupal\improvements_title\ImprovementsTitleResolver
    arguments: ['@controller_resolver', '@string_translation', '@http_kernel.controller.argument_resolver']