last woks fo x-chart component testing ...

package.json

@@ -58,6 +58,7 @@
     "zone.js": "~0.11.4"
   },
   "devDependencies": {
+    "@angular-builders/custom-webpack": "^12.1.1",
     "@angular-devkit/build-angular": "~12.1.3",
     "@angular/cdk": "^12.1.3",
     "@angular/cli": "~12.1.3",
@@ -106,6 +107,7 @@
     "ng-packagr": "^12.1.2",
     "ngx-device-detector": "^2.1.1",
     "ngx-markdown": "^12.0.1",
+    "node-polyfill-webpack-plugin": "^1.1.4",
     "ol": "^6.6.1",
     "shx": "^0.3.3",
     "typescript": "~4.3.5",