2 files changed, 33 insertions, 0 deletions
diff --git a/sonar-css-plugin/src/main/java/org/sonar/css/plugin/CssRules.java b/sonar-css-plugin/src/main/java/org/sonar/css/plugin/CssRules.java
index c463622..5248ff0 100644
--- a/sonar-css-plugin/src/main/java/org/sonar/css/plugin/CssRules.java
+++ b/sonar-css-plugin/src/main/java/org/sonar/css/plugin/CssRules.java
@@ -29,6 +29,7 @@ import javax.annotation.Nullable;
 import org.sonar.api.batch.rule.CheckFactory;
 import org.sonar.api.batch.rule.Checks;
 import org.sonar.api.rule.RuleKey;
+import org.sonar.css.plugin.rules.AtRuleNoUnknown;
 import org.sonar.css.plugin.rules.BlockNoEmpty;
 import org.sonar.css.plugin.rules.ColorNoInvalidHex;
 import org.sonar.css.plugin.rules.CommentNoEmpty;
@@ -67,6 +68,7 @@ public class CssRules {
 
   public static List<Class> getRuleClasses() {
     return Collections.unmodifiableList(Arrays.asList(
+      AtRuleNoUnknown.class,
       BlockNoEmpty.class,
       ColorNoInvalidHex.class,
       CommentNoEmpty.class,
diff --git a/sonar-css-plugin/src/main/java/org/sonar/css/plugin/rules/AtRuleNoUnknown.java b/sonar-css-plugin/src/main/java/org/sonar/css/plugin/rules/AtRuleNoUnknown.java
new file mode 100644
index 0000000..3a2a821
--- /dev/null
+++ b/sonar-css-plugin/src/main/java/org/sonar/css/plugin/rules/AtRuleNoUnknown.java
@@ -0,0 +1,31 @@
+/*
+ * SonarCSS
+ * Copyright (C) 2018-2018 SonarSource SA
+ * mailto:info AT sonarsource DOT com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+package org.sonar.css.plugin.rules;
+
+import org.sonar.check.Rule;
+
+@Rule(key = "S4662")
+public class AtRuleNoUnknown implements CssRule {
+
+  @Override
+  public String stylelintKey() {
+    return "at-rule-no-unknown";
+  }
+}