import { fn } from "https://deno.land/x/ddc_vim@v4.3.1/deps.ts";
const { win_findbuf } = fn;
Returns a List with window-IDs for windows that contain
buffer {bufnr}. When there is none the list is empty.
Can also be used as a method:
GetBufnr()->win_findbuf()
Parameters
denops: Denops