How do I reference a dependency from an upstream package?

Development Package Manager
1

Imagine I have a package called commonPackage:

import PackageDescription

let package = Package(
	name: "commonPackage",
	dependencies: [.package(url: "https://github.com/SwiftGen/SwiftGen.git", from: "6.6.2")]
)

I can run swift run swiftgen in a terminal application which gives me:

swift run swiftgen
Building for debugging...
Build complete! (0.34s)
Error: `swiftgen.yml` is not a config file
Usage: swiftgen config run [--config <config>] [--quiet] [--normal] [--verbose]
  See 'swiftgen config run --help' for more information.

This is great, but it's in my commonPackage which has no code.

Now imagine I have another package called consumerPackage with a dependency on commonPackage:

import PackageDescription

let package = Package(
	name: "consumerPackage",
	dependencies: [.package(path: "/Users/user/Developer/commonPackage")]
)

Now when I run swift run swiftgen, I get

swift run swiftgen
error: 'commonpackage': package 'commonpackage' contains no products

What do I need to do to be able to run swift run swiftgen in the consumerPackage directory?
What product do I need to create in my commonPackage?

(I want to have the swiftgen dependency only in the commonPackage)