{
    "packages": [
        {
            "name": "foo/bar",
            "version": "1.0.0",
            "type": "library",
            "extra": {
                "some_key": "remove whole extra section when type is not composer-plugin",
                "class": "Foo\\Bar\\PluginClass",
                "other_key": "other value"
            }
        },
        {
            "name": "foo/baz",
            "version": "1.0.0",
            "type": "composer-plugin",
            "extra": {
                "some_key": "remove everything, but 'class' key extra section when type is composer-plugin",
                "class": "Foo\\Baz\\PluginClass",
                "other_key": "other value"
            }
        }
    ],
    "packages-dev": []
}