Accomodate to postcss-less@3

Author: hudochenkov

lib/getOrderData.js

@@ -8,13 +8,13 @@ const calcRulePatternPriority = require('./calcRulePatternPriority');
 module.exports = function getOrderData(expectedOrder, node) {
 	let nodeType;
 
-	if (node.type === 'decl') {
+	if (isAtVariable(node)) {
+		nodeType = 'at-variables';
+	} else if (node.type === 'decl') {
 		if (isCustomProperty(node.prop)) {
 			nodeType = 'custom-properties';
 		} else if (isDollarVariable(node.prop)) {
 			nodeType = 'dollar-variables';
-		} else if (isAtVariable(node.prop)) {
-			nodeType = 'at-variables';
 		} else if (isStandardSyntaxProperty(node.prop)) {
 			nodeType = 'declarations';
 		}

lib/isAtVariable.js

@@ -1,11 +1,7 @@
 /**
- * Check whether a property is a @-variable
- *
- * @param {string} property
- * @return {boolean} If `true`, property is a @-variable
+ * Check whether a property is a @-variable (Less)
  */
-'use strict';
 
-module.exports = function isAtVariable(property) {
-	return property[0] === '@';
+module.exports = function isAtVariable(node) {
+	return node.type === 'atrule' && node.variable;
 };