Add support for CSSRule.type

Author: cdoublev

lib/cssom/CSSRule-impl.js

@@ -1,4 +1,20 @@
 
+import {
+    CSSCounterStyleRule,
+    CSSFontFaceRule,
+    CSSFontFeatureValuesRule,
+    CSSImportRule,
+    CSSKeyframeRule,
+    CSSKeyframesRule,
+    CSSMarginRule,
+    CSSMediaRule,
+    CSSNamespaceRule,
+    CSSPageRule,
+    CSSStyleRule,
+    CSSSupportsRule,
+}
+from '../cssom/index.js'
+
 /**
  * @see {@link https://drafts.csswg.org/cssom-1/#cssrule}
  */
@@ -14,4 +30,48 @@ export default class CSSRuleImpl {
         this.parentRule = parentRule
         this.parentStyleSheet = parentStyleSheet
     }
+
+    /**
+     * @return {number}
+     * @see {@link https://drafts.csswg.org/cssom-1/#dom-cssrule-type}
+     */
+    get type() {
+        if (CSSStyleRule.isImpl(this)) {
+            return 1
+        }
+        if (CSSImportRule.isImpl(this)) {
+            return 3
+        }
+        if (CSSMediaRule.isImpl(this)) {
+            return 4
+        }
+        if (CSSFontFaceRule.isImpl(this)) {
+            return 5
+        }
+        if (CSSPageRule.isImpl(this)) {
+            return 6
+        }
+        if (CSSKeyframesRule.isImpl(this)) {
+            return 7
+        }
+        if (CSSKeyframeRule.isImpl(this)) {
+            return 8
+        }
+        if (CSSMarginRule.isImpl(this)) {
+            return 9
+        }
+        if (CSSNamespaceRule.isImpl(this)) {
+            return 10
+        }
+        if (CSSCounterStyleRule.isImpl(this)) {
+            return 11
+        }
+        if (CSSSupportsRule.isImpl(this)) {
+            return 12
+        }
+        if (CSSFontFeatureValuesRule.isImpl(this)) {
+            return 14
+        }
+        return 0
+    }
 }