Class default

This plugin deep fetches resources during prefetching based on CSS selectors.

** Example **

 import DeepFetchPlugin from '@edgio/prefetch/sw/DeepFetchPlugin'
 import { Prefetcher } from '@edgio/prefetch/sw'

 new Prefetcher({
   plugins: [
     new DeepFetchPlugin([
       {
         selector: 'img.product-main-image,
         maxMatches: 1,
         as: 'image',
         attribute: 'src'
       }
     ])
   ]
 })