Type safe Slash Commands Options ?

public override registerApplicationCommands(registry: Command.Registry) {
        registry.registerChatInputCommand((builder) =>
            builder //
                .setName(this.name)
                .setDescription(this.description)
                .addStringOption((builder) => {
                    return builder
                        .setName('difficulty')
                        .setDescription('Choose a difficulty')
                        .addChoices({ name: 'Easy', value: 'easy' }, { name: 'Medium', value: 'medium' }, { name: 'Hard', value: 'hard' });
                })
        );
    }