er/src/commands/admin.ts

import { ApplicationCommandOptionType, Channel,  CommandInteraction, GuildMember, PermissionsBitField } from "discord.js";
import { Discord, Guard, GuardFunction, Slash, SlashGroup, SlashOption } from "discordx";
import { prisma } from "../main.js";

const AdminOnly: GuardFunction<CommandInteraction> = async (
  arg,
  client,
  next
) => {
  const argObj = arg instanceof Array ? arg[0] : arg;
  const user = argObj.user as GuildMember

  if (user.permissions.has(PermissionsBitField.Flags.Administrator)) await next();
}

@Discord()
@SlashGroup({ name: "admin", description: "Admin commands" })
@SlashGroup("admin")
@Guard(AdminOnly)
class AdminCmds {
  @Slash({description: "Set or get the configured channel for reports"})
  async reports(
    @SlashOption({
      description: "Set where the reports should be sent",
      name: "reports_channel",
      required: false,
      type: ApplicationCommandOptionType.Channel
    })
    channel: Channel,
    interaction: CommandInteraction
  ) {
    if (channel) {
      await prisma.guild.findUnique({
        where: {
          id: interaction.guildId!
        }
      }).then(async (data) => {
        if (data) {
          await prisma.guild.update({
            where: {
              id: data.id
            },
            data: {
              reports_channel_id: channel.id,
            }
          })
        } else {
          await prisma.guild.create({
            data: {
              id: interaction.guildId!,
              name: interaction.guild!.name,
              reports_channel_id: channel.id
            }
          })
        }

        interaction.reply(`<#${channel.id}> is now setup to receive reports.`)
      })
    } else {
      await prisma.guild.findUnique({
        where: {
          id: interaction.guildId!
        }
      }).then((data) => {
        if (data) {
          interaction.reply(`<#${data.reports_channel_id}> is currently receiving reports for this guild.`)
        } else {
          interaction.reply("Reports are currently disabled for this guild")
        }
      })
    }
  }
}