Variables aren't imported

[trotzig]

Originally reported by @ivangeorgiew in #476, but moved here to better capture things:

Thanks, its working now. However I found other bugs with fixImports:
Here MY_VAR isn't imported.

const bla = {
keyName: obj[MY_VAR]
}
Desctructured aliases are imported, but they shouldn't be:
myAlias shouldn't be imported.

const { prop: myAlias } = obj

[trotzig]

I've got a lot on my plate right now, so I won't get to this in a while. If anyone is willing to give it a go, here's a good commit to use for inspiration:
2f1ced7