How to make project with main application and cli application in the same folder?

[alex via Digitalmars-d-learn]

Hi guys. Trying to play with vibe-d and want to create separate 
web app, and cli app which can add admin users. When I just keep 
both files app.d and cli.d in source folder, I get an error that 
I can't have more then 1 main function.

I already asked chatGPT, and it replied that I need to use 
subpackages. I put cli into separate folder, and now I get an 
error, that it can't see some model from main app(I want to reuse 
UserModel for both, cli and web app). How can I make it visible 
for both cli and web without making copy?

My folder:

project
 | -- dub.json
 | -- source/
       | -- app.d
       | -- user_model.d
 | -- cli/
       | -- source
              | -- cli.d

dub.json:
{
        "name": "project",
        "subPackages": [
        {
            "name": "app",
            "sourcePaths": ["source"],
            "mainSourceFile": "source/app.d",
            "targetType": "executable",
                        "dependencies": {
                                "vibe-d": "~>0.9"
                        }
        },
        {
            "name": "cli",
            "sourcePaths": ["cli/source"],
            "mainSourceFile": "cli/source/cli.d",
            "targetType": "executable",
                        "dependencies": {
                                "vibe-d": "~>0.9"
                        }
        }
    ]
}