Refactor fullscreen command

src/commands/view/Fullscreen.js

@@ -1,4 +1,5 @@
 import { isElement } from 'underscore';
+
 module.exports = {
   /**
    * Check if fullscreen mode is enabled
@@ -21,7 +22,6 @@ module.exports = {
    * @return {string}
    */
   enable(el) {
-    debugger;
     var pfx = '';
     if (el.requestFullscreen) el.requestFullscreen();
     else if (el.webkitRequestFullscreen) {
@@ -63,13 +63,14 @@ module.exports = {
 
   run(editor, sender, opts = {}) {
     this.sender = sender;
-    var target = isElement(opts.target)
-      ? els
-      : document.querySelector(opts.target);
-    var pfx = this.enable(target || editor.getContainer());
+    const { target } = opts;
+    const targetEl = isElement(target)
+      ? target
+      : document.querySelector(target);
+    const pfx = this.enable(targetEl || editor.getContainer());
     this.fsChanged = this.fsChanged.bind(this, pfx);
     document.addEventListener(pfx + 'fullscreenchange', this.fsChanged);
-    if (editor) editor.trigger('change:canvasOffset');
+    editor.trigger('change:canvasOffset');
   },
 
   stop(editor, sender) {