TextPattern composer setup

composer.json

{
    "name": "my/mysite",
    "type": "project",
    "authors": [
        {
            "name": "My Name",
            "email": "[email protected]"
        }
    ],
    "require": {
        "textpattern/textpattern": "dev-main",
        "oomphinc/composer-installers-extender": "^2.0"
    },
    "repositories": {
        "textpattern": {
            "type": "vcs",
            "url": "[email protected]:textpattern/textpattern.git"
        }
    },
    "extra": {
        "installer-types": ["project"],
        "installer-paths": {
            "site/": [
                "textpattern/textpattern"
            ]
        }
    },
    "config": {
        "allow-plugins": {
            "composer/installers": true,
            "oomphinc/composer-installers-extender": true
        }
    }
}