import { commands } from "https://deno.land/x/sane_fmt@0.13.0/x/args.ts";
const { MergeCommand } = commands;
Merge two command parsers
type
<LeftVal, RightVal, Error extends ParseError>(left: Command<CommandReturn.Main<LeftVal>, readonly Error[]>, right: Command<CommandReturn.Main<RightVal>, readonly Error[]>) => Command<MergeCommandReturn<LeftVal, RightVal>, readonly Error[]>