Cannot find module node_modules/babel-loader/lib/index.js?cacheDirectory

**I'm submitting a bug report**

**Webpack Version:**
"webpack": "^4.20.2"

**Babel Core Version**:
"@babel/core": "^7.0.0"

**Babel Loader Version**:
"babel-loader": "^8.0.0"

**Please tell us about your environment:**
OSX 10.14

webpack config:

```js
new HappyPack({
id: 'jsx',
threads: 4,
loaders: [
{
loader: 'babel-loader?cacheDirectory',
options: require('./babel.config'),
exclude: ['/node_modules/']
}
]
}),
```

Error Image:


Node_modules folder have `babel-loader`, when I remove cacheDirectory option, it's ok,

Use the webpack configuration shown in the report as the reproduction entry point. Run the setup with `babel-loader?cacheDirectory` and then without that option, confirming the module-resolution error and recording the listed webpack, @babel/core, babel-loader, and HappyPack versions. Done means the cacheDirectory form works with this configuration.

Written by the indexing model from the issue text.