import { nvim_buf_del_extmark } from "https://deno.land/x/denops_std@v5.0.2/function/nvim/mod.ts";
Removes an extmark.
Parameters:
{buffer} Buffer handle, or 0 for current buffer
{ns_id} Namespace id from nvim_create_namespace()
{id} Extmark id
Return: true if the extmark was found, else false