User emoji contribution on Slack

emoji-count.js

const userCount = Array
  .from(document.querySelectorAll('.author_cell a'))
  .map((node) => node.innerText)
  .sort()
  .reduce((prev, curr) => (prev[curr] = ++prev[curr] || 1, prev), {});

const sortedCount = Object
  .keys(userCount)
  .sort((a,b) => userCount[b] - userCount[a])
  .map(u => [u, userCount[u]])

sortedCount.forEach(([u, c]) => console.log(u, c))