fix the cicular reference

src/common/math.js

@@ -21,7 +21,6 @@
 
 import {NS} from './namespaces.js';
 import {getTransformList} from './svgtransformlist.js';
-import {isNullish} from './utilities.js';
 
 // Constants
 const NEAR_ZERO = 1e-14;
@@ -152,7 +151,7 @@ export const transformBox = function (l, t, w, h, m) {
  * @returns {SVGTransform} A single matrix transform object
 */
 export const transformListToTransform = function (tlist, min, max) {
-  if (isNullish(tlist)) {
+  if (!tlist) {
     // Or should tlist = null have been prevented before this?
     return svg.createSVGTransformFromMatrix(svg.createSVGMatrix());
   }

src/common/units.js

@@ -7,7 +7,6 @@
  */
 
 import {NS} from './namespaces.js';
-import {isNullish} from './utilities.js';
 
 const wAttrs = ['x', 'x1', 'cx', 'rx', 'width'];
 const hAttrs = ['y', 'y1', 'cy', 'ry', 'height'];
@@ -306,7 +305,7 @@ export const isValidUnit = function (attr, val, selectedElement) {
     // not already present
     try {
       const elem = elementContainer_.getElement(val);
-      result = (isNullish(elem) || elem === selectedElement);
+      result = (!elem || elem === selectedElement);
     } catch (e) {}
     return result;
   }