Autocompleting variables in imported JS files does not work

Have the following file, foo.js:

var myvar = "i'm a js var"

Have qml file bar.qml:

import Qt 4.7
import "foo.js" as Stuff

Item {
objectName: Stuff.myvar
}

When typing Stuff.myvar, autocompletion is not triggered for the JS variables. However, the code works when executed.