Warning appears in the console when using in Angular : CommonJS or AMD dependencies issue


```txt
ng serve

Warning: /[PATH_TO_SOME_FOLDER]/index.ts depends on 'postal-codes-js'.
CommonJS or AMD dependencies can cause optimization bailouts.
For more info see: https://angular.io/guide/build#configuring-commonjs-dependencies

** Angular Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ **

✔ Compiled successfully.
```
