@sapphire/discord.js-utilities - isPrivateThreadChannel

import { container } from '@sapphire/framework'
import type { PrivateThreadChannel, Snowflake } from 'discord.js'
import { ChannelType } from 'discord.js'

/**
 * Attempts to fetch a {@link PrivateThreadChannel} from the provided channelId
 */
export async function getPrivateThreadChannel(channelId: Snowflake): Promise<PrivateThreadChannel> {
  const channel = await container.client.channels.fetch(channelId)
  if (channel?.type === ChannelType.PrivateThread) {
    return channel
  }
  throw new Error('channelId is not a Private Thread Channel')
}