Workflows in the OCaml Platform With many contributions from the OCaml community contributors and particularly Jeremie Dimino, Louis Gesbert, Raja Boujbel, Thomas Gazagnaire, Nathan Rebours for the content here
 (full list on slide 3) OCaml Workshop @ ICFP August 2019 Anil Madhavapeddy (speaker),
 Gemma Gordon, David Allsopp
 University of Cambridge Computer Laboratory 

The OCaml Platform opam packaging LTS (2.0.5) LGPLv2 dune building LTS (1.11.1) MIT DCO merlin editing stable (3.3.2) MIT utop exploring stable (2.4.1) BSD3 ocp-indent editing stable (1.7.0) LGPLv2 mdx testing stable (1.4.0) ISC bun testing devel (0.3.3) MIT odoc documenting devel (1.4.1) ISC dune-release packaging devel (1.3.2) ISC ocamlformat editing devel (0.11.0) MIT CLA in 2019 

Platform Contributors: 250+ Akinori Abe, Ashish Agarwal, Ion Alberdi, David Allsopp, Leo Andres, Olivier Andrieu, Florian Angeletti, Edgar Aroutiounian, Nicolas Assouad, Tuncer Ayaz, Anton Bachin, Nicolas Ojeda Bar, Mathieu Barbin, Yotam Barnoy, Jochen Bartl, Jacob Bass, Romain Beauxis, Daniel Below, Matthias Andreas Benkard, Josh Berdine, Vincent Bernardoff, Vincent Berthoux, Francois Bobot, Richard Bonichon, Nick Borden, Mehdi Bouaziz, Raja Boujbel, Frédéric Bour, Daniel Buenzli, Elliott Cable, Romain Calascibetta, Benjamin Canou, Hezekiah Carty, Pierre Chambart, Amir Chaudhry, Kaustuv Chaudhuri, Xavier Clerc, Raphael Cornet, Roberto di Cosmo, Simon Cruanes, Tim Cuthbertson, Milo Davis, Richard Davison, Enguerrand Decorne, Ian Denhardt, Kate Deplaix, Dani Dickstein, Jeremie Dimino, Stephen Dolan, Damien Doliguez, Matthieu Dubuget, Tim Dysinger, Spiros Eliopoulos, John Else, Mohamed Elsharnouby, Shon Feder, Fabrice Le Fessant, Jean- Christophe Filliatre, Jared Forsyth, Simon Fowler, Alain Frisch, Anders Peter Fugmann, Sylvain Le Gall, Jacques Garrigue, Thomas Gazagnaire, Louis Gesbert, Gaetan Gilbert, Geoff Gole, Gemma Gordon, Ivan Gotovchits, Rudi Grinberg, Michael Grunewald, Oliver Gu, Adrien Guatto, Xavier Guerin, Armaël Gueneau, Mads Hartmann, Andreas Hauptmann, Philipp Haselwarter Gregoire Henry, Hugo Heuzard Daniel Hillerström, Sebastien Hinderer, Juergen Hoetzel, Wilfred Hughes, Ronan Le Hy, Takayuki Imada, Keigo Imai, Riso Isrof, Vincent Jacques, Martin Jambon, Kevin Ji, David Kaloper-Mersinjak, Brandon Kase, Anton Kochkov, Tomasz Kolodziejski, Chis Konstad, Marek Kubica, Marc Lasson, Theo Laurent, Qi Li, Nandor Licker, Jon Ludlam, Thomas Leonard, Rodolphe Lepigre, Maxime Lesourd, Gabe Levi, Martin Lucina, Ximin Luo, Anil Madhavapeddy, Louis Mandel, Luc Marange, Claude Marche, Thierry Martinez, Laurent Mazare, Tim McGilchrist Hannes Mehnert, Perry E. Metzger, Wojciech Meyer, Etienne Millon, Ben Millwood, Samuel Mimram, Yaron Minsky, Cedric Le Moigne, Sebastien Mondet, Florent Monnier, Richard Mortier, Darin Morrison, Markus Mottl, Max Mouratov, Tony Narlock, Andre Nathan, Olivier Nicole, Jason Nielsen, Gregory Nisbet, Andrew Noyes, Leandro Ostera, Saswat Padhi, Egor Panfilov, Vasilis Papavasileiou, Guillaume Petiot, Bryan Phelps, Zach Ploskey, Lucas Pluvinage, Francois Pottier, Nicolas Pouillard, Mindy Preston, Bobby Priambodo, Dominic Price, Raphael Proust, Steve Purcell, Gabriel Radanne, Tahina Ramananandro, Daniel de Rauglaudre, Andrew Ray, Nathan Rebours, Thomas Refis, Jan Rehders, Chris Reichert, Andrea Richiardi, Marshall Roch, Louis Roche, Mario Rodas, Leonid Rozenberg, Julien Sagot, Gabriel Scherer, Bernhard Schommer, David Scott, Pavel Senchanka, Marcello Seri, David Sheets, Mark Shinwell, Zach Shipko, KC Sivaramakrishnan, Magnus Skjegstad, Ryan Slade, Romain Slootmaekers, Roma Sokolov, Anurag Soni, Benjamin San Souci, Patrick Stapfer, Jason Staten, Quentin Stievenart, Alessandro Strada, Sander Spies, Yury Sulsky, Thibault Suzanne, Willy Tan, Dario Teixeira, Rijnard van Tonder Edwin Torok, Christophe Troestler, Martin Trojer, Frederic Tuong, Pierre Vandenhove, Raman Varabets, Ramana Venkata, Ricky Vetter, Jordan Walke, Liang Wang, Philippe Wang, Marc Weber, Pierre Weis, Sebastian Wiesner, Leo White, John Whitington, Maverick Woo, Justin Wood, Hao Wu, Hongchang Wu, Jeremy Yallop, Syohei Yoshida, Jianxin Zhao, aalekseyev, art-w, asmanur, Axiles, chrismamo1, copy, dkim, Fourchaux, gerdstolpmann, Kakadu, madroach, mfp, mwweissmann, nberth, ncihnegn, nv-vn, Nyavlys, orbitz, polazarus, prometheansacrifice, pszilagyi, pveber, sliquister, tategakibunko, tddsg, torkve, whitequark, ygrek, zogg 

The OCaml Platform makes users productive with the OCaml language But who are these users? This talk will focus on the use-cases we are building the OCaml tooling for 

OS Distributions Big OCaml Project OCaml compiler sourceforge Debian RedHat OpenBSD ocamlforge inria Big OCaml Project in 2009 

OS Distributions Big OCaml Project OCaml compiler sourceforge Debian RedHat OpenBSD ocamlforge inria Big OCaml Project Primary mechanism for users to get software Packaged with apt, rpm, ports, etc No centralised distribution or version control in 2009 

opam-repository OS Distributions Big OCaml Project OCaml compiler sourceforge Debian RedHat OpenBSD ocamlforge inria Big OCaml Project lwt re extlib cryptokit async pxp xen in 2012 opam 

opam-repository OS Distributions Big OCaml Project OCaml compiler sourceforge Debian RedHat OpenBSD ocamlforge inria Big OCaml Project lwt re extlib cryptokit async pxp xen Centralised git repository of community code Chunk projects into shareable libraries in 2012 opam 

opam-repository OS Distributions Big OCaml Project OCaml compiler github Debian RedHat OpenBSD github Big OCaml Project lwt re extlib cryptokit async pxp dbm ocaml labltk camlp4 xen github in 2014 opam 

opam-repository OS Distributions Big OCaml Project OCaml compiler github Debian RedHat OpenBSD in 2014 github Big OCaml Project lwt re extlib cryptokit async pxp dbm ocaml labltk camlp4 xen github Almost everyone shifts to GitHub for hosting Compiler starts moving packages into opam opam 

opam-repository OS Distributions Big OCaml Project OCaml compiler github Debian RedHat OpenBSD github Big OCaml Project lwt re extlib cryptokit async pxp dbm ocaml labltk camlp4 xen github Arch macOS Alpine OpenSUSE Windows FreeBSD ocamlbuild ppx in 2015 opam 

opam-repository OS Distributions Big OCaml Project OCaml compiler github Debian RedHat OpenBSD github Big OCaml Project lwt re extlib cryptokit async pxp dbm ocaml labltk camlp4 xen github Arch macOS Alpine Lots more packaging work for OS distros opam used by most OCaml developers OpenSUSE Windows FreeBSD ocamlbuild ppx in 2015 opam opam CI tests many distributions on every PR 

opam-repository OS Distributions Big OCaml Project OCaml compiler github Debian RedHat OpenBSD github Big OCaml Project opam lwt re extlib cryptokit async pxp dbm ocaml labltk camlp4 xen github Arch macOS Alpine OpenSUSE Windows FreeBSD ocamlbuild ppx Reason
 ML in 2017 Package Managers npm yarn esy 

opam-repository OS Distributions Big OCaml Project OCaml compiler github Debian RedHat OpenBSD github Big OCaml Project opam lwt re extlib cryptokit async pxp dbm ocaml labltk camlp4 xen github Arch macOS Alpine OpenSUSE Windows FreeBSD ocamlbuild ppx Reason
 ML in 2017 Package Managers npm yarn esy Now packaging gets complex! Different workflows Poor opam is being overloaded 

A preponderance of wrapping 

make ocaml dpkg apt manual process of wrapping OCaml packages fixed versions of OCaml and libraries OS distro packaging done by distro maintainers 

make ocaml dpkg apt opam ocaml opam-repo ocamlbuild OS distro Dev Workflow 

make ocaml dpkg apt opam ocaml source oriented developer workflow opam-repo ocamlbuild multiple versions of OCaml and packages wrapping “make” or “ocamlbuild” OS distro Dev Workflow distro maintainers take a snapshot of opam-repo regularly 

make ocaml dpkg apt opam ocaml opam-repo ocamlbuild opam ocamlbuild opam-repo make esy npm OS distro Dev Workflow ReasonML ocaml 

OS distro Dev Workflow ReasonML make ocaml dpkg apt opam ocaml opam-repo ocamlbuild “distros cant keep up with package volume!” - Debian maintainer “pinning 100 packages takes a long time!” - MirageOS developer opam ocamlbuild opam-repo make esy npm ocaml “opam needs lock files to match the npm workflow!” - ReasonML maintainer “everyone is complaining about different things!” - Anil Madhavapeddy 

opam lib merlin lib debian redhat openbsd alpine arch macos npm brew esy lib ounit ppx mdx yarn cygwin wsl odoc format ocamlfind ocamlbuild SLOW ocaml 

User archetypes • “Library author” - Reusable ML logic, not directly executable - OCaml algorithms, protocols, data structures, numeric methods, … • “End user” - Wants to use an application written in OCaml - Has little patience to learn tools, wants to solve problems! • “Distribution maintainer” - Works on maintaining a Linux distro like Debian or RedHat - Needs to make OCaml apps interoperate with their own policies • “Web/mobile/unikernel developer” - Write in a frontend syntax like ReasonML - Cross-compile to targets like JavaScript, wasm, iOS, Android end-to-end workflows to improve 

The OCaml Platform Challenge #1:
 incrementally update tools without breaking any workflow Challenge #2:
 remove endless layers of tools wrapping tools 
 Our answer: dune and opam 
 - composable, declarative builds: specialised to OCaml - reduce choice: deprecate ocamlbuild, omake, make - far higher performance and reproducibility in return. in 2017 in 2019 

Rearranging responsibilities opam the tool has been overloaded! • We have two distinct styles of workflows: • libraries: collections of OCaml modules • projects: executables, data • shift build logic into new tool: dune • packaging is what opam continues to do 

foo.1.0 foo.2.0 bar.0.2 bar.0.3 bar.1.0 opam install foo 

foo.1.0 foo.2.0 bar.0.2 bar.0.3 bar.1.0 opam install foo ocaml.4.07.1 bar.0.3 foo.1.0 opam solver ocaml.4.08.1 bar.1.0 foo.2.0 

foo.1.0 foo.2.0 bar.0.2 bar.0.3 bar.1.0 opam install foo ocaml.4.07.1 bar.0.3 foo.1.0 make foo.1.0 install foo.1.0 make bar.0.3 install bar.0.3 opam solver ocaml.4.08.1 bar.1.0 foo.2.0 

foo.1.0 foo.2.0 bar.0.2 bar.0.3 bar.1.0 opam install foo ocaml.4.07.1 bar.0.3 foo.1.0 make foo.1.0 install foo.1.0 make bar.0.3 install bar.0.3 opam solver make; ocamlbuild; ocamlfind; ocamldep; ocamlc; ocamlopt ocaml.4.08.1 bar.1.0 foo.2.0 install bin/foo install lib/ocaml/bar make; ocamlbuild; ocamlfind; ocamldep; ocamlc; ocamlopt 

foo.1.0 foo.2.0 bar.0.2 bar.0.3 bar.1.0 opam install foo ocaml.4.07.1 bar.0.3 foo.1.0 make foo.2.0 install foo.2.0 make bar.1.0 install bar.1.0 opam solver make; ocamlbuild; ocamlfind; ocamldep; ocamlc; ocamlopt ocaml.4.08.1 bar.1.0 foo.2.0 install bin/foo install lib/ocaml/bar make; ocamlbuild; ocamlfind; ocamldep; ocamlc; ocamlopt 

foo.1.0 foo.2.0 bar.0.2 bar.0.3 bar.1.0 opam update foo ocaml.4.07.1 bar.0.3 foo.1.0 make foo.2.0 install foo.2.0 make bar.1.0 install bar.1.0 opam solver make; ocamlbuild; ocamlfind; ocamldep; ocamlc; ocamlopt ocaml.4.08.1 bar.1.0 foo.2.0 install bin/foo install lib/ocaml/bar make; ocamlbuild; ocamlfind; ocamldep; ocamlc; ocamlopt 

foo.1.0 foo.2.0 bar.0.2 bar.0.3 bar.1.0 opam install foo ocaml.4.07.1 bar.0.3 foo.1.0 opam solver ocaml.4.08.1 bar.1.0 foo.2.0 

foo.1.0 foo.2.0 bar.0.2 bar.0.3 bar.1.0 opam install foo ocaml.4.07.1 bar.0.3 foo.1.0 opam solver ocaml.4.08.1 bar.1.0 foo.2.0 opam source bar.0.3 opam source foo.1.0 dune build ocamldep ocamlc ocamlopt bin/foo 

foo.1.0 foo.2.0 bar.0.2 bar.0.3 bar.1.0 opam install foo ocaml.4.07.1 bar.0.3 foo.1.0 opam solver ocaml.4.08.1 bar.1.0 foo.2.0 opam source bar.0.3 opam source foo.1.0 dune build ocamldep ocamlc ocamlopt bin/foo Packaging 

foo.1.0 foo.2.0 bar.0.2 bar.0.3 bar.1.0 opam install foo ocaml.4.07.1 bar.0.3 foo.1.0 opam solver ocaml.4.08.1 bar.1.0 foo.2.0 opam source bar.0.3 opam source foo.1.0 dune build ocamldep ocamlc ocamlopt bin/foo Packaging Build 

User archetypes • “Library author” - Reusable ML logic, not directly executable - OCaml algorithms, protocols, data structures, numeric methods, … • “End user” - Wants to use an application written in OCaml - Has little patience to learn tools, wants to solve problems! • “Distribution maintainer” - Works on maintaining a Linux distro like Debian or RedHat - Needs to make OCaml apps interoperate with their own policies • “Web/mobile/unikernel developer” - Write in a frontend syntax like ReasonML - Cross-compile to targets like JavaScript, wasm, iOS, Android end-to-end workflows to improve 

Libraries foo.1.0 foo.2.0 bar.0.2 bar.0.3 bar.1.0 opam install version constraints multiple valid choices of versions Role: Library Author 

Projects unison.git tezos.git /lib /foo /src /bar /lib /foo /src /bar /bin unison /bin tezos git clone dune install Role: End User 

Projects unison.git tezos.git /lib /foo /src /bar /lib /foo /src /bar /bin unison /bin tezos binary is the only public output of projects git clone dune install every library needed is in source tree Role: End User dubbed a “duniverse” 

Projects unison.git tezos.git /lib /foo /src /bar /lib /foo /src /bar /bin unison /bin tezos Libraries foo.1.0 foo.2.0 bar.0.2 bar.0.3 bar.1.0 Role: Project Maintainer 

Projects unison.git tezos.git /lib /foo /src /bar /lib /foo /src /bar /bin unison /bin tezos Libraries foo.1.0 foo.2.0 bar.0.2 bar.0.3 bar.1.0 duniverse init uses opam solver to pull libraries into project library upgrade is per project Role: Project Maintainer 

Projects unison.1.2.0 tezos.2.3.0 /lib /foo /src /bar /lib /foo /src /bar /bin unison /bin tezos Libraries foo.1.0 foo.2.0 bar.0.2 bar.0.3 bar.1.0 Role: Distribution Maintainer 

Projects unison.1.2.0 tezos.2.3.0 /lib /foo /src /bar /lib /foo /src /bar /bin unison /bin tezos Libraries foo.1.0 foo.2.0 bar.0.2 bar.0.3 bar.1.0 debian can solve for a coinstallable library / project set dune can generate deb package metadata Role: Distribution Maintainer 

Projects unison.git tezos.git /lib /foo /src /bar /lib /foo /src /bar /bin unison /bin tezos Libraries foo.1.0 foo.2.0 bar.0.2 bar.0.3 bar.1.0 esy / npm can vendor multiple versions of libraries dune artefact cache does sharing Role: Web developer 

merlin ocamlformat mdx ppx ounit dune composable build specifications bun cohttp ctypes infer coq flow mirageos f* zarith libs/ app/ tools/ 

opam merlin ocamlformat mdx ppx ounit dune multiple versions of libraries composable build specifications bun cohttp ctypes infer coq flow mirageos f* zarith libs/ app/ tools/ 

opam merlin debian redhat *bsd alpine arch macos ocamlformat mdx ppx ounit generate upstreamable OS packages dune cygwin wsl ubuntu multiple versions of libraries composable build specifications bun cohttp ctypes infer coq flow mirageos f* zarith libs/ app/ tools/ 

opam merlin debian redhat *bsd alpine arch macos npm esy ocamlformat mdx ppx ounit generate upstreamable OS packages dune cygwin wsl generate package manager metadata ubuntu multiple versions of libraries composable build specifications bun cohttp ctypes infer coq flow mirageos f* zarith libs/ app/ tools/ yarn 

User archetypes • “Library author” - Reusable ML logic, not directly executable - OCaml algorithms, protocols, data structures, numeric methods, … • “End user” - Wants to use an application written in OCaml - Has little patience to learn tools, wants to solve problems! • “Distribution maintainer” - Works on maintaining a Linux distro like Debian or RedHat - Needs to make OCaml apps interoperate with their own policies • “Web/mobile/unikernel developer” - Write in a frontend syntax like ReasonML - Cross-compile to targets like JavaScript, wasm, iOS, Android end-to-end workflows to improve 

Next Steps: Library Author • Continue to use opam as you do today! • 1.2 -> 2.0 switch - everyone has switched now. Regular point releases of 2.0.x to cover portability, workflow fixes, sandboxing improvements. • New maintainer Raja Boujbel has cut recent releases, along with Louis Gesbert and David Allsopp. • Plans for opam 2.1 and 2.2 are: a new solver based on Z3, Windows support, integrated depext. 

Next Steps: Library Author 0 2000 4000 6000 8000 10000 12000 01/01/12 01/01/13 01/01/14 01/01/15 01/01/16 01/01/17 01/01/18 01/01/19 01/01/20 %s Time unique opam packages 

Next Steps: Library Author • Existing CI system is popular and useful, but cumbersome to use • https://ci.ocaml.org/ • Working on next generation CI to make life easier: • https://github.com/ocaml-ci/ • https://ci.ocamllabs.io • Based on a DSL similar to dune rules, so can express complex workflows. • Term language that can work with CLI and web • Automate bug triage — revdep breakage • Easy to extend with Discourse, Slack, etc 

Next Steps: End User • Projects using duniverse now: • https://github.com/realworldocaml/book • https://github.com/avsm/duniverse • https://github.com/avsm/platform • Dune has been one of the fastest adopted Platform efforts since opam. • git clone; dune build 

Next Steps: End User opam dune merlin odoc ocamlformat ocp-indent utop bun publishing autoformatting editing documenting ppx_expect testing building "duniverse" monorepo for Platform project mdx 

Next Steps: End User • Coming soon in dune 2.0:
 dune artefact cache • https://github.com/ocaml/dune/pull/2493 • Reliable per-rule caching of binary artefacts • Works locally first, eventually networking • Will eventually support reproducible builds throughout our stack, and therefore safe networked binary caches of OCaml code. 

Next Steps: Project Maintainer • duniverse tool to bridge opam and dune https://github.com/avsm/duniverse • currently supports: • duniverse init: turn opam packages into git refs • duniverse pull: fetch git refs to local tree • coming soon: • duniverse update: merge new opam packages • duniverse install: add new opam packages 

Next Steps: Project Maintainer • Do you have to use dune to get these benefits? 

Next Steps: Project Maintainer Yes 

Next Steps: Project Maintainer • Do you have to use dune to get these benefits? • Yes, but we maintain a transition remote: • https://github.com/dune-universe/opam-overlays • duniverse prototype tool automates inserting overrides. • We will provide a formal specification of dune files, so other implementations can be built. 

Next Steps: Project Maintainer commit 632bc2eed00704bbbcdb5531d709c8d3f0cb0939 Author: Thomas Gazagnaire Date: Wed Mar 28 15:49:16 2012 +0200 Initial commit commit db943c24fe3ed5cec4dd432b1a01c66602d5f2f3 Author: Xavier Leroy Date: Sun Jul 24 19:04:21 2016 +0200 Add depexts for CentOS et al ~4 years opam-repo 

Next Steps: Project Maintainer commit 632bc2eed00704bbbcdb5531d709c8d3f0cb0939 Author: Thomas Gazagnaire Date: Wed Mar 28 15:49:16 2012 +0200 Initial commit commit db943c24fe3ed5cec4dd432b1a01c66602d5f2f3 Author: Xavier Leroy Date: Sun Jul 24 19:04:21 2016 +0200 Add depexts for CentOS et al ~4 years commit 93b5d9bdb9c25d1ea86a96a9c9fce93ecebd5c6d Author: Jeremie Dimino Date: Sun Oct 30 19:07:53 2016 +0000 initial import opam-repo dune 

Next Steps: Project Maintainer • But seriously, do not switch until ready. • Transitions for big projects can take years. • dune project is ready and willing to help users transition (e.g. coq, mirage, why3, frama-c) • ocaml 4.08.x has early dune files 

Next Steps: Project Maintainer • But seriously, do not switch until ready. • Transitions for big projects can take years. • dune project is ready and willing to help users transition (e.g. coq, mirage, why3, frama-c) • ocaml 4.08.x has early dune files (lang dune 1.10) ;; every metadata file is versioned 

Next Steps: Project Maintainer • But seriously, do not switch until ready. • Transitions for big projects can take years. • dune project is ready and willing to help users transition (e.g. coq, mirage) • ocaml 4.08.x has early dune files CHANGES in one year: 1.2.0: polling mode for build, private modules 1.3.0: robust merlin file generation, colors on Windows! 1.4.0: automatic code formatter targets, menhir rules 1.5.0: @check target for rapid type checking, cross compilation for ocamlfind 1.6.0: more flexible directory layouts for embedding in other projects 1.7.0: improved optimisation for cmx, install metadata, formally specified cycle detection 1.8.0: code promotion improvements, better c++ support, merlin on Windows 1.9.0: library variants and default implementations, coq support 1.10.0: generate opam metadata, future syntax shims, compile-time selection of os/arch 1.11.0: dune init, cinaps support, build version embedding, inline test improvements 

Next Steps: Distribution Maintainer • Our Linux distribution friends need more assistance! • Historically they have had good tooling to bridge, but now need better opam/dune integration. • Challenging new project in 2020 is Deb/RPM generation from duniverses. 

Next Steps: Distribution Maintainer • Vision: multiple coinstallable and buildable trees that represent all of Debian’s or CentOS’s OCaml code in one git tree. • This is incredibly essential for the future of OCaml development. • A single dune build can test tens of millions of lines of OCaml code with multicore, flambda, algebraic effects and other new features in OCaml. 

Next Steps: web/mobile/unikernel developer • duniverses make cross compilation to exotic targets extremely viable. • see talk on MirageOS 4 later today! • wrapping just a build system like dune frees esy / npm to do their own packaging • huge ecosystem potential of JavaScript, wasm, iOS/Android, unikernel, unlocked by OCaml 

The OCaml Platform opam LTS (2.0.5) LGPLv2 dune LTS (1.11.1) MIT DCO merlin stable (3.3.2) MIT utop stable (2.4.1) BSD3 ocp-indent stable (1.7.0) LGPLv2 mdx devel (1.4.0) ISC bun devel (0.3.3) MIT odoc devel (1.4.1) ISC dune-release devel (1.3.2) ISC ocamlformat devel (0.11.0) MIT CLA in 2019 discuss.ocaml.org 

The OCaml Platform in 2019… opam dune merlin odoc ocamlformat ocp-indent mdx utop bun publishing autoformatting editing documenting ppx_expect testing Closer integration between tools dune-release building 

Contact Lead Maintainers opam LTS (2.0.5) Raja Boujbel, Louis Gesbert dune LTS (1.11.1) Jeremie Dimino, Rudi Grinberg merlin stable (3.3.2) Fred Bour, Thomas Refis utop stable (2.4.1) Jeremie Dimino ocp-indent stable (1.7.0) Louis Gesbert mdx devel (1.4.0) Thomas Gazagnaire bun devel (0.3.3) Mindy Preston odoc devel (1.4.1) Anton Bachin, Jon Ludlam dune-release devel (1.3.2) Thomas Gazagnaire, Nathan Rebours ocamlformat devel (0.11.0) Josh Berdine, Guillaume Petiot in 2019 discuss.ocaml.org 

The OCaml Platform in 2019… opam dune merlin odoc ocamlformat ocp-indent utop bun publishing autoformatting editing documenting ppx_expect testing building "duniverse" monorepo for Platform project mdx 

The OCaml Platform opam LTS (2.0.5) LGPLv2 dune LTS (1.11.1) MIT DCO merlin stable (3.3.2) MIT utop stable (2.4.1) BSD3 ocp-indent stable (1.7.0) LGPLv2 mdx devel (1.4.0) ISC bun devel (0.3.3) MIT odoc devel (1.4.1) ISC dune-release devel (1.3.2) ISC ocamlformat devel (0.11.0) MIT CLA