(() => {
  'use strict';

  let collections = Meteor.connection._mongo_livedata_collections;
  let names = Object.keys(collections);
  let result = {};

  for (let name of names) {
    let collection = Meteor.connection._mongo_livedata_collections[name];
    let keys = Object.keys(collection._docs._map);

    result[collection.name] = keys.length;
  }

  return result;
})();