List Members in Channel

import { WebClient } from "@slack/web-api"

export type DynSelect_channel = string

// Dropdown of channels the token can see; private channels need groups:read.

export async function channel(auth: RT.Slack) {

  if (!auth?.token) return []

  const client = new WebClient(auth.token)

  const res = await client.conversations

    .list({

      types: "public_channel,private_channel",

      exclude_archived: true,

      limit: 1000,

    })

    .catch(() =>

      client.conversations.list({ exclude_archived: true, limit: 1000 })

    )

  return (res.channels ?? []).map((c) => ({

    value: c.id!,

    label: `#${c.name}`,

  }))

}

/**

 * List Members in Channel

 * List the user IDs in a conversation (resolve them with Get User). Page with `cursor` = the previous `response_metadata.next_cursor`. Needs channels:read (groups:read for private channels, im:read / mpim:read for DMs).

 */

export async function main(

  auth: RT.Slack,

  channel: DynSelect_channel,

  limit?: number,

  cursor?: string

) {

  const client = new WebClient(auth.token)

  return await client.conversations.members(

    dropEmpty({ channel, limit, cursor })

  )

}

function dropEmpty<T extends { [key: string]: any }>(params: T) {

  return Object.fromEntries(

    Object.entries(params).filter(

      ([, v]) => v !== undefined && v !== null && v !== ""

    )

  ) as T

}