webpack-obfuscator not working on Firebase deployment

まだ誰も着手していません。

## 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I have taken a look at these issues, but either they are outdated or not work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 )

再現に使用されている package.json の依存関係と Firebase Functions のデプロイ設定から始め、動作する firebase emulators:start のパスと firebase deploy を比較します。デプロイされた関数で難読化パッケージが利用可能であることを確認し、報告された Cannot find module エラーを完了確認に使用します。

索引モデルが issue の本文から書いたものです。