composer.json

{
    "name": "xwp/site-monorepo-example",
    "type": "project",
    "license": "MIT",
    "repositories": [
        {
            "type": "path",
            "url": "wp-content/themes/sample-theme"
        },
        {
            "type": "composer",
            "url": "https://wpackagist.org",
            "only": [
                "wpackagist-plugin/*",
                "wpackagist-theme/*"
            ]
        }
    ],
    "extra": {
        "wordpress-install-dir": "wp",
        "installer-paths": {
            "wp-content/themes/{$name}": ["type:wordpress-theme"],
            "wp-content/plugins/{$name}": ["type:wordpress-plugin"]
        }
    },
    "config": {
        "allow-plugins": {
            "roots/wordpress-core-installer": true,
            "composer/installers": true
        }
    },
    "require": {
        "xwp/sample-theme": "^1.0",
        "roots/wordpress": "^6.0",
        "wpackagist-theme/twentytwentytwo": "^1.2"
    },
    "require-dev": {
        "wp-cli/wp-cli-bundle": "^2.6",
        "xwp/wait-for": "^0.0.1"
    },
    "scripts": {
        "test-theme": "composer test --working-dir=wp-content/themes/sample-theme"
    }
}