var AUTHOR_DOM_QUERY = '.display_flex.align_items_center.break_word.bold';

doIt(AUTHOR_DOM_QUERY);
function doIt(query) {
  // lucky for us, slack uses jQuery and lodash
  return _.chain($(query).text().split('\n'))
        .filter(hasLetters)
        .map(trimEm)
        .groupBy()
        .mapValues('length')
        .value();
}

function hasLetters(str) {
      return str.match(/[a-z]/);
}

function trimEm(str) {
      return str.trim();
}