webpack's watch and hot replace is invalid when use brfs

I use brfs like this:

```
var examples = {
basic: require('fs').readFileSync(__dirname + '/01-basic.js', 'utf-8'),
};
```

and when I modify the file of `01-basic.js`, the watch and auto compile and hot-replace is invalid.
In addition ,I use the `webpack-dev-server`.
The only way to resolve this problem is `Ctrl + C`to stop ,and run `npm start` again.
This is too inconvenient to work effectively,Does someone has the solution?