function errimport { err } from "https://deno.land/x/ahh@v0.11.0/src/result/mod.ts"; err<T, E extends Error>(res: Result<T, E>): Option<E>Converts res into a Some if it is an Err. ExamplesExample 1 import { default as R } from "./mod.ts"; console.log(R.err(1)); // undefined console.log(R.err(Error())); // Error() Type ParametersTE extends ErrorParametersres: Result<T, E>ReturnsOption<E>