Working in PWA

I've developed a simple app using the barcode-scanner.

It works in developer mode, but as soon as I switch to production mode i get
```
[Scanner Web Error] QR code parse error, error = l: No MultiFormat Readers were able to detect the code.
```
The workaround that I found was to set in angular.js
```
"production": {
....
"optimization": {
"scripts": false,
"styles": true
}
}
```

But I don't like it.
Any idea of what might be tree-shaked and how to avoid it?