I do what AI says. It says stick to webpack-cli max 4.9.2.

Author: fulopattila122

tests/frontend/package.mix.json

@@ -16,6 +16,6 @@
     "sass": "^1.59",
     "sass-loader": "^13.0",
     "alpinejs": "^3.15.2",
-    "webpack-cli": "^4.10.0"
+    "webpack-cli": ">=4.0.0 <=4.9.2"
   }
 }