method Router.prototype.paramimport { Router } from "https://deno.land/x/oak@v12.1.0/router.ts"; param<R extends string, S extends State = RS>(param: keyof RouteParams<R>, middleware: RouterParamMiddleware<R, RouteParams<R>, S>): Router<S>Register param middleware, which will be called when the particular param is parsed from the route. Type ParametersR extends stringoptionalS extends State = RSParametersparam: keyof RouteParams<R>middleware: RouterParamMiddleware<R, RouteParams<R>, S>ReturnsRouter<S>