@riotjs/parser/src/utils/add-to-collection.js

The parser for Riot tags

/**
 * Add an item into a collection, if the collection is not an array
 * we create one and add the item to it
 * @param   {Array} collection - target collection
 * @param   {*} item - item to add to the collection
 * @returns {Array} array containing the new item added to it
 */
export default function addToCollection(collection = [], item) {
  collection.push(item)
  return collection
}