This gist will present some of the best command handlers to use for making a bot using discord,js.
The reason I include my own handler here is that it is indeed one of the best options to use to make a Discord bot. It has many configuration options that allow you to extend and override many of its default behaviors, middleware (a la express), and TS typings (it was made to work in TS more than JS). One con of this handler may be that it has a rather large bundle size. It even includes type checking and provides parsed types of arguments!