Class CommandManager

Registrating a command. The actual command handler is registered on server to unlock the feature like permission based command or something, so it'd write a event on client and registered a handler on server to trigger the command from registered command in client.

registerCommand(
     'hello',
     (src, args) => console.log('Hello!'),
     {
         description: "Say Hello"
     }
});

Set a description on command, this function is executed automatically after you registering a command with configuration that contain description.

https://docs.fivem.net/docs/resources/chat/events/chat-addSuggestion/