willaengine/resources/js/Global/utils/common/convertStructureTreeToList.js

export default (data) => {
	var arrayList = [];

	function recursiveFunction(array) {
		for (const iterator of array) {
			if (iterator.children && iterator.children.length) {
				let clone = Object.assign({}, iterator);
				delete clone.children;
				arrayList.push(clone);
				let list = recursiveFunction(iterator.children);
				arrayList.concat(list);
			} else {
				arrayList.push(iterator);
			}
		}
		return arrayList;
	}

	return recursiveFunction(data);
};