How to use the @kentico/kontent-delivery.DeliveryClient function in @kentico/kontent-delivery

export default (ctx, inject) => {
  // Create new  delivery client Instance
  let settings = JSON.parse('KENTICOOPTIONS')

  // Add tracking header
  settings = Object.assign({}, settings, {
    globalQueryConfig: {
      customHeaders: [
        { header: 'X-KC-SOURCE', value: 'kentico-kontent-nuxt-module' }
      ]
    }
  })

  const deliveryClient = new DeliveryClient(settings)

  const cacheService = new CacheService([])

  deliveryClient.viaCache = function (query, seconds, cacheKey) {
    return cacheService.viaCache(query, seconds, cacheKey, process.server)
  }

  // Inject the deliveryClient to the context as $deliveryClient
  ctx.$deliveryClient = deliveryClient
  inject('deliveryClient', deliveryClient)
}