function fn.reg_executingimport { fn } from "https://deno.land/x/ddc_vim@v2.3.0/deps.ts"; const { reg_executing } = fn; 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>