class BaseRouter {

    app: express.Application = express;

    // some other comment stuff
}

function PostMethod(route: string = '/') {

    return (target: BaseRouter, key: string, descriptor: PropertyDescriptor): void {

        // This is where things don't work out
        // descriptor.value correctly returns the RequestHandler which I can attach to express
        // target.app is undefined
        target.app.post(route, descriptor.value);
    }
}

@ResourceRouter() // <= this is optional, can I access all decorators inside the class from this decorator? That would also lead me to a solution
export class BlogRouter extends BaseRouter {


    @GetMethod()
    index(req, res) {

        // req.send(...); return posts
    }


    @GetMethod('/:modelId')
    show(req, res, next) {

         // find req.params.modelId
    }

    @PostMethod()
    createPost() {}

    @DeleteMethod()
    deletePost() {}

    @UpdateMethod()
    updatePost() {}
}