import { many1 } from "https://deno.land/x/pazza@v0.3.0/mod.ts";
Repeat them embedded parser at least once.
many1(alpha())("").ok === false;
many1(alpha())("a").output; // ==> ["a"]
many1(alpha())("a1").output; // ==> ["a"]
many1(alpha())("a1").input === "1";