import { args } from "https://deno.land/x/feomasto@v0.1.0/priv/deps.ts";
const { DrainOption } = args;
Declare an option that drains all arguments after the flag
CLI example: --opt abc def ghi → ['abc', 'def', 'ghi']
type
<Name extends string, Value>(name: Name, descriptor: DrainOptionDescriptor<Value>) => FlagType<Name, Value[]>