Parse string array to extract opts (++opt).

import { Denops } from "../mod.ts";
import { parseOpts } from "./mod.ts";

export async function main(denops: Denops): Promise<void> {
  const args = [
    "++enc=sjis",
    "++ff=dos",
    "-f",
    "--foo=foo",
    "--bar=bar",
    "--bar=baz",
    "hello",
    "world",
  ];
  const [opts, residues] = parseOpts(args);

  console.log(opts);
  // { "enc": "sjis", "ff": "dos" }

  console.log(residues);
  // ["-f", "--foo=foo", "--bar=bar", "--bar=baz", "hello", "world"]
}