fix(project): exclude CSS files from side-effects

CHANGELOG.md

@@ -6,6 +6,10 @@ All notable changes to [bpmn-js](https://github.com/bpmn-io/bpmn-js) are documen
 
 ___Note:__ Yet to be released changes appear here._
 
+## 1.2.1
+
+* `FIX`: correct side-effects config to not include `*.css` files
+
 ## 1.2.0
 
 * `FEAT`: add initial snapping when creating associations

package.json

@@ -35,7 +35,9 @@
     }
   ],
   "license": "SEE LICENSE IN LICENSE",
-  "sideEffects": false,
+  "sideEffects": [
+    "*.css"
+  ],
   "devDependencies": {
     "babel-core": "^6.26.0",
     "babel-preset-env": "^1.6.1",