package slacko

  1. Overview
  2. Docs


  • Support additional arguments to chat.post_message and chat.update

  • Adjust build process to use dune instead of jbuilder

  • Replace topkg code with dune-release


  • Higher precision timestamps.

  • Adjust to changes in Slack APIs.

  • Support for CoHTTP > 1.0.

  • Ported to jbuilder, should yield easier integration with whole ecosystem, faster builds and less boilerplate.

  • Depend on OCaml 4.04.

  • Add support for releasing via topkg, thus adding this changelog.


  • Fixes a number of previously broken endpoints.

  • Adds an integration test to make sure that whatever is implemented keeps on working.


  • Added type chat to abstract away from all types of channels Slack supports.

  • Removed topic-is-too-long errors as the binding checks the topic length beforehand.

  • Added conversation as a new type instead of string IM conversation type.

  • More syntactic sugar in code, endpoint definitions now a long pipe.


  • The binding now looks up User/Channel/Group IDs and rejects invalid ones.

  • The message length is now validated: messages that are too long cannot be generated anymore.

  • Adds support for some more new Slack methods:

    • channels.archive

    • channels.create

    • channels.rename

    • channels.unarchive

    • groups.archive

    • groups.rename

    • groups.unarchive


In this release, one of the main criticisms was addressed: the API calls are now represented by their own types, so there are now channel types, user types and many more. Some parameters can have only a limited number of values, these are also represented using their own types so calling the methods with incorrect values is impossible.

The code was updated to use the new Lwt 2.4.6 ppx macros instead of Camlp4, so this is the minimum required release. Also, better use OCaml 4.02.0 for improved support for ppx.


  • Added method.

  • Broken up apierror into a set of more relevant types per function.


Time to get this code to the internetz!


  • 100% API coverage and a handy tool to post messages to Slack.

  • Also, some rudimentary docs and a neat logo made by yours truly.


Innovation. Community. Security.