graphback-keycloak-auth-extend.ts

import { KeycloakCrudService } from '@graphback/keycloak-authz'

class CustomCrudService extends KeycloakCrudService {
  // custom implementation
}

const services = createKeycloakRuntimeContext({ 
  models,
  schema: model,
  db,
  pubSub,
  authConfig,
  dataProvider: KnexDBDataProvider,
  crudService: CustomCrudService
})