mustache_templates-8.x-1.0-beta4/modules/mustache_token/mustache_token.services.yml

services:
  mustache.token:
    decorates: token
    decoration_priority: -200
    parent: token
    class: Drupal\mustache_token\MustacheCoreToken
    calls:
      - [setDecoratedToken, ['@mustache.token.inner']]