Package.resolved isn't versioned; How are deterministic Package versions achieved?

(Xcodegen version 2.10.1)

Hey!

I'm trying to migrate our iOS project that uses Xcodegen, to start using a SwiftPM library we use internally. As part of doing this, I am specifying, in my project.yml, the SwiftPM dependency to use.
However, in trying to attempt this, I run into the following problem that is fundamentally at odds with Xcodegen:

1. From this article I understand that the Package.resolved file--used for making sure all developers are using the same version of packages is stored in the .xcodeproj directory. Here's the relevant quote:

You can find the Package.resolved file inside your .xcodeproj directory at [appName].xcodeproj/project.workspace/xcshareddata/swiftpm/Package.resolved

2. However, the premise of using Xcodegen is that the repository is able to discard the .xcodeproj folder and related artefacts. So the Package.resolved file can also not be checked in.
3. How then do developers of a repository get deterministically same versions of their dependencies? I may be missing something here.

Read the linked SwiftPM guidance and compare it with XcodeGen's project.yml dependency handling. Determine where Package.resolved is expected after project generation and document the supported workflow for keeping package versions deterministic. Done means the issue has a definitive, project-specific answer.