Custom Webpack canot find modules

I wanted to add HtmlWebpackPlugin, so i added:

to my package.json
`"electronWebpack": {
"renderer": {
"webpackConfig": "webpack.renderer.additions.js"
}
}`

webpack.rendere.additions.js
```
const HtmlWebpackPlugin = require('html-webpack-plugin');
const webpack = require('webpack');

module.exports = {
plugins: [
new HtmlWebpackPlugin({
title: 'Vue Webpack Electron Boilerplate',
template: 'index.html',
inject: true
})
]
}
```

But now it can't seem to find any modules i am importing. I am importing vuex and it says it cannot find that module. But i do get my new html file loaded but the renderer's js doesn't overwrite the #app.