import { foldcolumn } from "https://deno.land/x/denops_std@v6.4.0/option/mod.ts";
When non-zero, a column with the specified width is shown at the side
of the window which indicates open and closed folds. The maximum
value is 12.
See folding.
(default 0)
not available when compiled without the +folding feature
type
LocalOption<number>