Autocompletion of SPM dependencies and go to definition info

Hi! I'm just started looking into Swift and, as a part of learning process, I'm trying to configure my editor so it can use some toolchain features. I don't want to use Xcode for a number of reasons, so I'm hacking on Atom.

My first goals are:

1. Setup proper autocompletion.
2. Implement go to definition functionality.

I use nuclide to write JS/Reason code and I tried its Swift integration. It works great when I operate in the scope of my own code. But when I add dependency and build the project—it builds, but autocompletion doesn't work b/c sourcekitten cli returns empty array (it doesn't see external modules). I also tried --spm-module MyPackage flag, but received empty array as well. Should I do something special to make it work or add something to Package.swift? Or it's out of scope of SourceKitten and I should go lower?

On the second item in my list, tbh I haven't looked much into it yet, but I'd be grateful for some directions or even keywords b/c I kinda wander in the dark now.

Thanks in advance!

Start by reproducing the empty autocompletion result with SourceKitten’s CLI against a Swift Package Manager dependency, including the --spm-module MyPackage case. Read the project’s Package.swift handling and the SourceKitten entry points involved in completion and definition lookup. Done means the scope is defined and dependency completion and go-to-definition behavior are implemented or documented with a clear limitation.