import { fn } from "https://deno.land/x/ddc_vim@v2.3.0/deps.ts";
const { tabpagenr } = fn;
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| goes to). if there is no previous tab page 0 is returned. The number can be used with the |:tab| command.