Fix sorting issue in Node.js 11

Author: hudochenkov

lib/sorting.js

@@ -14,6 +14,10 @@ function sortDeclarations(a, b) {
 		if (!postcss.vendor.prefix(a.name).length && postcss.vendor.prefix(b.name).length) {
 			return 1;
 		}
+
+		if (postcss.vendor.prefix(a.name).length && !postcss.vendor.prefix(b.name).length) {
+			return -1;
+		}
 	}
 
 	if (!_.isUndefined(a.orderData) && !_.isUndefined(b.orderData)) {
@@ -68,6 +72,10 @@ function sortDeclarationsAlphabetically(a, b) {
 			if (!postcss.vendor.prefix(a.name).length && postcss.vendor.prefix(b.name).length) {
 				return 1;
 			}
+
+			if (postcss.vendor.prefix(a.name).length && !postcss.vendor.prefix(b.name).length) {
+				return -1;
+			}
 		}
 
 		return a.initialIndex - b.initialIndex;