function reg_executingimport { reg_executing } from "https://deno.land/x/denops_std@v3.8.1/function/mod.ts"; reg_executing(denops: Denops): Promise<unknown>Returns the single letter name of the register being executed. Returns an empty string when no register is being executed. See |@|. Returns the single letter name of the register being executed. Returns an empty string when no register is being executed. See |@|. Parametersdenops: DenopsReturnsPromise<unknown>