webpack loader problem

I keep getting

`Module parse failed: You may need an appropriate loader to handle this file type.`

```
| import React from 'react';
| import { createHistory, createHashHistory } from 'history';
| import Root from './Root';
@ multi main
```

Start by reproducing the reported Module parse failed error from the import sequence shown in the issue, then inspect the webpack loader configuration and the referenced entry points: main, Root, and the history imports. Done means identifying the file type that lacks an appropriate loader and confirming that the sample app builds successfully.

Written by the indexing model from the issue text.