Is it possible to change files encoding to UTF-8 with BOM?

I'm using angular-filter npm package within a cordova app. That app is being targeted to all 3 mobile platforms (iOS, Android, WP) and I'm having issues while trying to publish a WP version. Basically, when the app is being processed after a store upload, it gives me errors for `angular-filter.js` and `angular-filter.min.js` that those files should be UTF-8 with BOM. I'm using a plenty of other npm packages and those are the only files that have this issue.

Would it be possible to change encoding inside angular-filter package? Would that affect negatively anyone?