import { tabpagenr } from "https://deno.land/x/denops_std@v6.4.0/function/mod.ts";
The result is a Number, which is the number of the current tab page. The first tab page has number 1.
The optional argument {arg} supports the following values:
$ the number of the last tab page (the tab page
count).
# the number of the last accessed tab page
(where g<Tab> goes to). if there is no
previous tab page 0 is returned.
The number can be used with the :tab command.
Returns zero on error.
Parameters
denops: Denops