React is loaded multiple times when a dependency references it (in render)

* **Version**: 22.5.1

* **Target**: macOS 10.14.6 (using dev server)

I am suspecting this is my config issue because I can't seem to find a similar issue reported.
In short, what happened was it seems `react` is being loaded twice, and that breaks the `react-use` library because it calls react hooks. And hooks don't like more than one instance of `react`.
From the DevTool message it should be clear that there is one `react` from the bundled JS and the other from a later loaded bundle.
I was not familiar with webpack, and after tracing it down, I thought the existence of the second bundle was due to all my libraries being in the `externals` of the webpack config. So I did a little hack to add `react` and `react-dom` into `externals`:
```javascript
module.exports = (config) => {
config.externals = [...config.externals, 'react', 'react-dom'];
return config;
};
```
And then it worked:

I see that they are intentionally removed from `externals` via https://github.com/electron-userland/electron-webpack/blob/ad730ec8da38cd8b570618091b77558284978070/packages/electron-webpack/src/main.ts#L281-L282
May I ask why that was necessary? Or what did I configure wrong?
Here are my electron-related dependencies (add-ons and so on):
```
"electron": "^8.2.2",
"electron-builder": "^22.4.1",
"electron-webpack": "^2.8.2",
"electron-webpack-eslint": "^6.0.0",
"electron-webpack-ts": "^4.0.1",
"typescript": "^3.8.3",
"webpack": "^4.42.1"
```
And my `build` config:
```
{
"asar": true,
"compression": "maximum",
"dmg": {
"format": "ULFO"
},
"mac": {
"identity": null,
"target": [
{
"target": "dmg",
"arch": "x64"
},
{
"target": "zip",
"arch": "x64"
}
]
},
"win": {
"target": [
{
"target": "nsis",
"arch": "x64"
},
{
"target": "zip",
"arch": "x64"
}
]
},
"linux": {
"target": [
{
"target": "AppImage",
"arch": "x64"
},
{
"target": "zip",
"arch": "x64"
}
],
"category": "Audio"
},
"nsis": {
"artifactName": "${productName}-setup-${version}.${ext}",
"uninstallDisplayName": "${productName}",
"oneClick": false,
"perMachine": true,
"packElevateHelper": true,
"allowElevation": true,
"allowToChangeInstallationDirectory": true,
"deleteAppDataOnUninstall": true
},
"appImage": {
"artifactName": "${productName}.${ext}"
}
}
```

I also looked at https://github.com/electron-userland/electron-webpack/issues/59 but I think that solution is outdated (react-hot-loader is V4 now). If people still recommend that I go down that route I'd be happy to do so. However, I still would like to get an answer for the above question. Thanks!