Composer - use local repo as package

stripped.example.composer.json

{
    ...
    "repositories": [
        {
            "type": "path",
            "url": "packages/vendor/package/",
            "symlink": "true"
        }
    ],
    "license": "MIT",
    "require": {
        "php": "^7.2.5",
        "vendor/package": "@dev"
        ...
    },
    ...
}