app/assets/javascripts/header.js


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import { highCountTrim } from '~/lib/utils/text_utility';

/**
 * Updates todo counter when todos are toggled.
 * When count is 0, we hide the badge.
 *
 * @param {jQuery.Event} e
 * @param {String} count
 */
$(document).on('todo:toggle', (e, count) => {
  const parsedCount = parseInt(count, 10);
  const $todoPendingCount = $('.todos-count');

  $todoPendingCount.text(highCountTrim(parsedCount));
  $todoPendingCount.toggleClass('hidden', parsedCount === 0);
});