Issue 5689 - Add rules for CSS declaration order to stylelint-config-eyeo

stylelint-config-eyeo/index.js

Index: stylelint-config-eyeo/index.js
===================================================================
--- a/stylelint-config-eyeo/index.js
+++ b/stylelint-config-eyeo/index.js
@@ -14,16 +14,19 @@
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 "use strict";
 
 module.exports = {
   extends: "stylelint-config-recommended",
+  plugins: [
+    "stylelint-order"
+  ],
   rules: {
     // Opening braces go on their own line
     "block-opening-brace-newline-before": "always-multi-line",
     "block-opening-brace-newline-after": "always-multi-line",
     "block-closing-brace-newline-before": "always-multi-line",
     "block-closing-brace-newline-after": "always",
     "block-closing-brace-empty-line-before": "never",
 
@@ -61,11 +64,15 @@
     "indentation": 2,
 
     // Line length should be 80 characters or less
     "max-line-length": 80,
 
     // Avoid qualifying ID and class names with type selectors
     "selector-no-qualifying-type": [true, {
       "ignore": ["attribute"]
-    }]
+    }],
+
+    // CSS rule declaration order should follow the WordPress CSS
+    // Coding Standards
+    "order/properties-order": require("./css-properties-order")
   }
 };