Do not use `??` operator at the moment.

Fix #110

CHANGELOG.md

@@ -1,3 +1,11 @@
+## 0.32.2
+
+* Do not use `??` operator at the moment.
+
+<br /> <br />
+
+
+
 ## 0.32.1
 
 * Build grid without DOM object.

css-doodle.js

@@ -1,4 +1,4 @@
-/*! css-doodle@0.32.1 */
+/*! css-doodle@0.32.2 */
 (function (global, factory) {
   typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
   typeof define === 'function' && define.amd ? define(factory) :
@@ -6256,9 +6256,15 @@ void main() {
   `;
   }
 
+  function get_content(input) {
+    return is_nil(input) ? '' : input;
+  }
+
   function create_cell(x, y, z, content, child = '') {
     let id = cell_id(x, y, z);
-    return `<cell id="${id}">${content['#' + id]??''}${child??''}</cell>`;
+    let head = get_content(content['#' + id]);
+    let tail = get_content(child);
+    return `<cell id="${id}">${head}${tail}</cell>`;
   }
 
   function create_grid(grid_obj, content) {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "css-doodle",
-  "version": "0.32.1",
+  "version": "0.32.2",
   "description": "A web component for drawing patterns with CSS",
   "main": "css-doodle.js",
   "scripts": {

src/index.js

@@ -632,9 +632,15 @@ function get_grid_styles(grid_obj) {
   `;
 }
 
+function get_content(input) {
+  return is_nil(input) ? '' : input;
+}
+
 function create_cell(x, y, z, content, child = '') {
   let id = cell_id(x, y, z);
-  return `<cell id="${id}">${content['#' + id]??''}${child??''}</cell>`;
+  let head = get_content(content['#' + id]);
+  let tail = get_content(child);
+  return `<cell id="${id}">${head}${tail}</cell>`;
 }
 
 function create_grid(grid_obj, content) {