The main change in this patch release is creating an npm release for the change in #2223, where exported event payload types were moved from bolt-js to @slack/types. If you see errors compiling your TypeScript-based application that look like:
Module './types' has already exported a member
.. then upgrading to this release should address the issue (see #2233 and #2234 for issue details).
next function to the last listener middleware by @filmaj in https://github.com/slackapi/bolt-js/pull/2214 (fixes #1457)@slack/types and consume event payloads from it by @filmaj in https://github.com/slackapi/bolt-js/pull/2223Full Changelog: https://github.com/slackapi/bolt-js/compare/@slack/bolt@3.21.1...@slack/bolt@3.21.2
Fetched April 3, 2026