import { browse } from "https://deno.land/x/denops_std@v6.4.0/function/mod.ts";
Put up a file requester. This only works when "has("browse")"
returns TRUE (only in some GUI versions).
The input fields are:
{save} when TRUE, select file to write
{title} title for the requester
{initdir} directory to start browsing in
{default} default file name
An empty string is returned when the "Cancel" button is hit,
something went wrong, or browsing is not possible.