Are module-deps options passed as parameter to the transforms?

The documentation is unclear about this point:

> If the transform is a function, it should take the file name as an argument

Then, the example shows a second parameters named `opts`:

```js
var through = require('through2');
module.exports = function (file, opts) { return through() };
```

What is this second parameter? Is it the options passed to module-deps constructor?