druid/node_modules/stylelint-order/rules/properties-order/createFlatOrder.js

const _ = require('lodash');

module.exports = function createFlatOrder(order) {
	const flatOrder = [];

	appendGroup(order);

	function appendGroup(items) {
		items.forEach((item) => appendItem(item));
	}

	function appendItem(item) {
		if (_.isString(item)) {
			flatOrder.push(item);

			return;
		}

		appendGroup(item.properties);
	}

	return flatOrder;
};