AST dumps for Swift Package Manager projects?

Hi all, is it possible to dump ASTs for a file that's part of a Swift Package Manager project? Usually, I'd use something like swiftc -dump-ast test.swift, but I guess I can't call swiftc directly if I want to build a Swift package (with dependencies etc). I tried doing swift build -Xswiftc -dump-ast, but it says <unknown>:0: error: this mode does not support emitting dependency files. Any thoughts?

It'd also be good to know if I can use SourceKit with Swift Package Manager builds, since apparently I also have to call SourceKit while passing flags for a valid compilation for it to work...