chore(TS): utils

src/canvas.class.ts

@@ -1055,7 +1055,7 @@ import { Point } from './point.class';
         upperCanvasEl = this._createCanvasElement();
         this.upperCanvasEl = upperCanvasEl;
       }
-      fabric.util.addClass(upperCanvasEl, 'upper-canvas ' + lowerCanvasClass);
+      upperCanvasEl.classList.add('upper-canvas ' + lowerCanvasClass);
       this.upperCanvasEl.setAttribute('data-fabric', 'top');
       this.wrapperEl.appendChild(upperCanvasEl);
 

src/shapes/image.class.ts

@@ -558,7 +558,8 @@
      */
     _initElement: function(element, options) {
       this.setElement( fabric.document.getElementById(element) || element, options);
-      fabric.util.addClass(this.getElement(), fabric.Image.CSS_CANVAS);
+      const newEl = this.getElement()
+      newEl.classList.add(fabric.Image.CSS_CANVAS);
     },
 
     /**

src/static_canvas.class.ts

@@ -317,7 +317,7 @@ import { pick } from './util/misc/pick';
         throw new Error('fabric.js: trying to initialize a canvas that has already been initialized');
         /* _DEV_MODE_END_ */
       }
-      fabric.util.addClass(this.lowerCanvasEl, 'lower-canvas');
+      this.lowerCanvasEl.classList.add('lower-canvas');
       this.lowerCanvasEl.setAttribute('data-fabric', 'main');
       if (this.interactive) {
         this._originalCanvasStyle = this.lowerCanvasEl.style.cssText;

test/unit/util.js

@@ -287,24 +287,6 @@
     assert.equal(el.getAttribute('some_random-attribute'), 'woot');
   });
 
-  QUnit.test('fabric.util.addClass', function(assert) {
-    var addClass = fabric.util.addClass;
-    assert.ok(typeof addClass === 'function');
-
-    var el = fabric.document.createElement('div');
-    addClass(el, 'foo');
-    assert.equal(el.className, 'foo');
-
-    addClass(el, 'bar');
-    assert.equal(el.className, 'foo bar');
-
-    addClass(el, 'baz qux');
-    assert.equal(el.className, 'foo bar baz qux');
-
-    addClass(el, 'foo');
-    assert.equal(el.className, 'foo bar baz qux');
-  });
-
   QUnit.test('fabric.util.wrapElement', function(assert) {
     var wrapElement = fabric.util.wrapElement;
     assert.ok(typeof wrapElement === 'function');