No default args

Author: Mohsen Azimi

js/ui/handler/scroll_zoom.js

@@ -45,12 +45,12 @@ class ScrollZoomHandler {
      * @example
      *  map.scrollZoom.enable({ around: 'center' })
      */
-    enable(options = {}) {
+    enable(options) {
         if (this.isEnabled()) return;
         this._el.addEventListener('wheel', this._onWheel, false);
         this._el.addEventListener('mousewheel', this._onWheel, false);
         this._enabled = true;
-        if (options.around === 'center') {
+        if (options && options.around === 'center') {
             this._aroundCenter = true;
         } else {
             this._aroundCenter = false;

js/ui/handler/touch_zoom_rotate.js

@@ -49,11 +49,11 @@ class TouchZoomRotateHandler {
      * @example
      *   map.touchZoomRotate.enable({ around: 'center' });
      */
-    enable(options = {}) {
+    enable(options) {
         if (this.isEnabled()) return;
         this._el.addEventListener('touchstart', this._onStart, false);
         this._enabled = true;
-        if (options.around === 'center') {
+        if (options && options.around === 'center') {
             this._aroundCenter = true;
         } else {
             this._aroundCenter = false;