How to use the diffhtml/dist/cjs/transition.addTransitionState function in diffhtml

var subscribe = function subscribe() {
    (0, _transition.addTransitionState)('attributeChanged', attributeChanged);

    // Add a transition for every type.
    keys(transitionsMap).forEach(function (name) {
      var map = transitionsMap[name];
      var transitionName = eventsToTransitionName[name] || name;

      var handler = function handler(child) {
        for (var _len = arguments.length, rest = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
          rest[_key - 1] = arguments[_key];
        }

        // If there are no elements to match here, abort.
        if (!map.size) {
          return;
        }