webpack-obfuscator not working on Firebase deployment

## Expected Behavior
`webpack-obfuscator` and `javacript-obfuscator` should be working on Firebase deployment without issue

## Current Behavior
My firebase functions are deployed correctly unless I import `webpack-obfuscator` or `javacript-obfuscator`
Always produce error
```
Did you list all required modules in the package.json dependencies?
Detailed stack trace: Error: Cannot find module 'webpack-obfuscator'
```

| | webpack-obfuscator | javacript-obfuscator |
|--|----------------|----------|
| sample code | | |
| error | | |

## Steps to Reproduce
- Install `webpack-obfuscator`
- Run `firebase emulators:start` to test the function, it working properly
- Run `firebase deploy` the functions can not be deployed

## Enviroment
- Node 14
- "webpack-obfuscator": "3.5.1",
- "javascript-obfuscator": "4.0.2"

## Reference
I have taken a look at these issues, but either they are outdated or not work
- https://github.com/javascript-obfuscator/javascript-obfuscator/issues/687
- https://github.com/javascript-obfuscator/webpack-obfuscator/issues/138
- https://github.com/javascript-obfuscator/webpack-obfuscator/issues/82#issue-667058896

cc: @sanex3339 since you found a bug in [loader](https://github.com/javascript-obfuscator/javascript-obfuscator/issues/687#issuecomment-665271638) ( but it was 3 years ago )

Commencez par les dépendances de package.json et la configuration de déploiement de Firebase Functions utilisée par la reproduction ; comparez le chemin fonctionnel de firebase emulators:start avec firebase deploy. Vérifiez que les packages d’obfuscation sont disponibles dans la fonction déployée, en utilisant l’erreur signalée Cannot find module comme vérification de fin.

Rédigé par le modèle d'indexation à partir du texte de l'issue.