From 66b3ebd06f2a33c82fd90d2f0a0872d9adf063c3 Mon Sep 17 00:00:00 2001
From: Ying Li <ying.li@linecorp.com>
Date: Tue, 28 Nov 2017 19:28:45 +0900
Subject: [PATCH] Add support for @supports

---
 lib/combine-mq.js | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/lib/combine-mq.js b/lib/combine-mq.js
index 34a4355..87b63b9 100755
--- a/lib/combine-mq.js
+++ b/lib/combine-mq.js
@@ -116,6 +116,8 @@
 				strCss += processMedia(rule);
 			} else if (rule.type === 'keyframes') {
 				strCss += processKeyframes(rule);
+			} else if (rule.type === 'supports') {
+				strCss += processSupports(rule);
 			}
 
 			return strCss;
@@ -171,6 +173,19 @@
 			return strCss;
 		};
 
+		// Process supports
+		var processSupports = function (supports) {
+			var strCss = '@supports ' + supports.supports + ' {';
+
+			supports.rules.forEach(function (rule) {
+				strCss += commentOrRule(rule);
+			});
+
+			strCss += '}';
+
+			return strCss;
+		};
+
 		// Process document
 		var processDocument = function(doc) {
 			var strCss = '@' + (typeof doc.vendor !== 'undefined' ? doc.vendor : '') + 'document ' + doc.document + ' {';
@@ -273,7 +288,7 @@
 				processedCSS.document.push(rule);
 			} else if (rule.type === 'charset') {
 				processedCSS.charset.push(rule);
-			} else if (rule.type === 'rule' || 'comment') {
+			} else if (rule.type === 'rule' || 'comment' || 'supports') {
 				processedCSS.base.push(rule);
 			}