SukkaSurge/Build/lib/domain-deduper.ts

import createTrie from './trie';

const domainDeduper = (inputDomains: string[]): string[] => {
  const trie = createTrie(inputDomains);
  const sets = new Set(inputDomains);

  for (let j = 0, len = inputDomains.length; j < len; j++) {
    const d = inputDomains[j];
    if (d[0] !== '.') {
      continue;
    }

    trie.find(d, false).forEach(f => sets.delete(f));

    const a: string = d.slice(1);

    if (sets.has(a)) {
      sets.delete(a);
    }
  }

  return Array.from(sets);
};

export default domainDeduper;