selectors.js

const SELECTORS = {
  rubadub: {
    url: 'http://www.rubadub.co.uk/records'
    selectors: ['.product-name']
  },
  boomkat: {
    url: 'https://boomkat.com'
    selectors: ['.release__details']
  }
}

for (let store in SELECTORS) {
  const $ = document.querySelector;
  store.selectors.forEach(selector => {
    Array.from($(store.selectors)).forEach(record => console.log(record))
  })
}