method Command.prototype.actionRe-exportimport { Command } from "https://deno.land/x/dyr@v1.3.1/deps.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