method Command.prototype.actionimport { Command } from "https://dotland.deno.dev/x/cliffy@v0.23.2/command/command.ts"; action(fn: IAction<CO, CA, CG, CPG, CT, CGT, CPT, CP>): thisSet command callback method. Parametersfn: IAction<CO, CA, CG, CPG, CT, CGT, CPT, CP>Command action handler. Returnsthis