{
    "private": true,
    "workspaces": [
        "workspace-a",
        "workspace-b"
    ]
}

Note that the private: true is required! Workspaces are not meant to be published, so we’ve added this safety measure to make sure that nothing can accidentaly expose them.

After this file has been created, create two new subfolders named workspace-a and workspace-b. In each of them, create another package.json file with the following content:

 

{
    "name": "workspace-a",
    "version": "1.0.0",

    "dependencies": {
        "cross-env": "5.0.5"
    }
}

{
    "name": "workspace-b",
    "version": "1.0.0",

    "dependencies": {
        "cross-env": "5.0.5",
        "workspace-a": "1.0.0"
    }
}

Finally, run yarn install somewhere, ideally inside the workspace root. If everything works well, you should now have a similar file hierarchy: