Annually-Funded Developers' Update: May/June 2025

Hello Fellow Clojurists! This is the third report from the 5 developers receiving Annual Funding in 2025.

Dragan Duric: Apple M Engine Neanderthal, MKL, OpenBlas
Eric Dallo: ECA, metrepl, clojure-lsp, clojure-lsp-intellij
Michiel Borkent: clj-kondo, babashka, SCI, quickblog, edamame, and more…
Oleksandr Yakushev: CIDER
Peter Taoussanis: Trove, Sente, Tufte

Dragan Duric

2025 Annual Funding Report 3. Published July 4, 2025.

My goal with this funding in 2025 is to support Apple silicon (M cpus) in Neanderthal (and other Uncomplicate libraries where that makes sense and where it’s possible).

In May and June, I completed Neanderthal’s Apple Silicon engine, updated MKL and OpenBLAS engines to be compatible with the introduced improvements to the overall code, fixed and polished many incompatibilities between the engines, and bugs that were introduced or discovered during the process, and updated all technologies newer versions. One huge improvement that the users will notice is AOT version of Neanderthal that is loading engines quickly.

I also reorganized Deep Diamond as separate technology-specific projects (so the users can configure their own combination appropriate to their systems) and an AOT project. I started working on the CPU engine for tensors and neural networks. It’s an uphill battle, since Apple’s API are:

• not very nice compared to Intel and Nvidia (which are atrocities themselves compared to Clojurians' standards :))
• poorly documented
• very inconsistent -
• contain several generations of deprecations and new ways of doing things
• buggy
• (most annoyingly) there are literally no code examples anywhere on the internet, so I have to discover everything by poking inside the REPL (I can’t imagine how people do that without Clojure/REPL :) So, I made lots of progress, but not nearly enough for a stable engine. It will take time.

As I also made some contributions to JavaCPP, I had to wait for it to release new version for the proper release of Neanderthal. They finally did it on 1st July, so I released Neanderthal as soon as I could (not in June, but day or two later :)

I also made assorted improvements and bugfixes to related Uncomplicate projects, all of them under the hood, but some of them very useful!

Here’s what I’ve proposed when applying for the CT grant.

I proposed to Implement an Apple M engine for Neanderthal. This involves:

• buying an Apple M2/3 Mac (the cheapest M3 in Serbia is almost 3000 USD (with VAT).
• learning enough macOS tools (Xcode was terrible back in the days) to be able to do anything.
• exploring JavaCPP support for ARM and macOS.
• exploring relevant libraries (OpenBLAS may even work through JavaCPP).
• exploring Apple Accelerate.
• learning enough JavaCPP tooling to be able to see whether it is realistic that I build Accelerate wrapper (and if I can’t, at least to know how much I don’t know).
• I forgot even little C/C++ that I did know back in the day. This may also give me some headaches, as I’ll have to quickly pick up whatever is needed.
• writing articles about relevant topics so Clojurians can pick this functionality as it arrives.

Projects directly involved: https://github.com/uncomplicate/neanderthal
https://github.com/uncomplicate/deep-diamond
https://github.com/uncomplicate/clojure-cpp
https://github.com/uncomplicate/clojurecuda

Looking at the funding proposal, I can say that I’m very satisfied that all the features that I promised to build are nicely progressing.

As the Deep Diamond Tensor stuff is brewing, I might start looking into Apple Metal and low-level GPU computing, so I can hope to also provide GPU computing on Apple silicon at least for Neanderthal, if not for Deep Diamond.

All in all, I feel optimistic about how this project progresses!

Eric Dallo

2025 Annual Funding Report 3. Published June 30, 2025.

In these last 2 months I could work on 2 main things, multiple improvements for clojure-lsp with fixes and new features and a exciting new project called ECA.

eca

ECA (Editor Code Assistant) is a OpenSource, free, standardized server written in Clojure to make any editor have AI features like Cursor, Continue, Claude and others. The idea is simple, it has a protocol heavily inspired by LSP, and editors can communicate with the eca server which will have the logic to communicate with multiple LLMs and provide AI features like chat, edit, MCPs, completion etc.

The project is in alpha state and there are so many things to do, but I hope community will help make this project a success!

Give a star to the project 🌟 and for more details check the roadmap

clojure-lsp

There were so many improvements for clojure-lsp regarding performance, fixes, and new features. The most notable new feature is the support for custom linters defined by the user, it follows a similar logic of clj-kondo hooks, but with improved support for clojure-lsp in-memory data access, giving power for linters know about the project and not only a single file, with test support for linters. Check the missing-unit-test custom linter:

2025.05.27-13.56.57 - 2025.06.13-20.45.44

• General

  • Consider .lsp/config.edn as part of project code, removing false positives of unused-public-var linter.

  • Consider full qualified symbols in edn files when checking for var references.

  • Improve clojure-lsp linter capabilities, migrating unused-public-var and different-aliases linters to be built-in linters. #2050

    • Migrate from clj-kondo custom-lint-fn but considering kondo settings to avoid breaking changes.
    • Considerably improve performance of unused-public-var and different-aliases linters.

  • Bump rewrite-clj to 1.2.50.

  • New feature: Add support for custom project linters. #2043 #2058

  • Publish to clojars com.github.clojure-lsp/clojure-lsp-test-helper to be able to test created custom linters.

  • Bump clj-kondo to 2025.04.08-20250526.195207-12.

  • Small performance improvements across clojure-lsp, especially on places with comparassions inside big loops.

  • Bump clj-depend to 0.11.1.

  • Provide analysis of unresolved namespaces, making features like definition, hover, references work.

  • Fix .lsp/config.edn file not found diagnostic when it doesn’t exist on project.

  • Fix custom linters source-paths analysis to consider all files in a source-path.

  • Fix crash on files with empty ignore comments.

  • Bump clj-kondo to 2025.06.05.

  • Fix analysis consistency for internal files.

  • Fix custom-linters not working for cases using clojure-lsp.custom-linters-api/find-nodes.

  • Improve clojure-lsp.custom-linters-api/dir-uris->file-uris to consider file-uris as well on input.

• Editor

  • Add support for LSP feature textDocument/selectionRange. #1961
  • Fix outdated analysis for watched created/deleted files (git branch switchs for example). #2046

• API/CLI

  • Replace tools.cli with babashka.cli. #2036

clojure-lsp-intellij

3.5.0

• Add support for creating Clojure namespaces. #78

metrepl

0.3.1 - 0.4.1

• Add compatibility with older opentelemetry versions.
• Fix read config from classpath
• Fix OpenTelemetry integration race condition corner case.
• Replace event/first-op-requested with info/repl-ready adding more info about the project.
• Add :first-time to :event/op-completed and :event/op-requested when op is load-file and first time processing it.
• Bump opentelemetry to 1.51.0.
  

Michiel Borkent

2025 Annual Funding Report 3. Published July 1, 2025.

In this post I’ll give updates about open source I worked on during May and June 2025. To see previous OSS updates, go here.

Sponsors

I’d like to thank all the sponsors and contributors that make this work possible. Without you the below projects would not be as mature or wouldn’t exist or be maintained at all! So a sincere thank you to everyone who contributes to the sustainability of these projects.

Current top tier sponsors:

• Clojurists Together
• Roam Research
• Nextjournal
• Nubank

Open the details section for more info about sponsoring.

Updates

Here are updates about the projects/libraries I’ve worked on in the last two months, 19 in total!

• babashka: native, fast starting Clojure interpreter for scripting.

  • Bump edamame (support old-style #^ metadata)
  • Bump SCI: fix satisfies? for protocol extended to nil
  • Bump rewrite-clj to 1.2.50
  • 1.12.204 (2025-06-24)
  • Compatibility with clerk’s main branch
  • #1834: make taoensso/trove work in bb by exposing another timbre var
  • Bump timbre to 6.7.1
  • Protocol method should have :protocol meta
  • Add print-simple
  • Make bash install script work on Windows for GHA
  • Upgrade Jsoup to 1.21.1
  • 1.12.203 (2025-06-18)
  • Support with-redefs + intern (see SCI issue #973
  • #1832: support clojure.lang.Var/intern
  • Re-allow init as task name
  • 1.12.202 (2025-06-15)
  • Support clojure.lang.Var/{get,clone,reset}ThreadBindingFrame for JVM Clojure compatibility
  • #1741: fix taoensso.timbre/spy and include test
  • Add taoensso.timbre/set-ns-min-level! and taoensso.timbre/set-ns-min-level
  • 1.12.201 (2025-06-12)
  • #1825: Add Nextjournal Markdown as built-in Markdown library
  • Promesa compatibility (pending PR here)
  • Upgrade clojure to 1.12.1
  • #1818: wrong argument order in clojure.java.io/resource implementation
  • Add java.text.BreakIterator
  • Add classes for compatibility with promesa:
    • java.lang.Thread$Builder$OfPlatform
    • java.util.concurrent.ForkJoinPool
    • java.util.concurrent.ForkJoinPool$ForkJoinWorkerThreadFactory
    • java.util.concurrent.ForkJoinWorkerThread
    • java.util.concurrent.SynchronousQueue
  • Add taoensso.timbre/set-min-level!
  • Add taoensso.timbre/set-config!
  • Bump fs to 0.5.26
  • Bump jsoup to 1.20.1
  • Bump edamame to 1.4.30
  • Bump taoensso.timbre to 6.7.0
  • Bump pods: more graceful error handling when pod quits unexpectedly
  • #1815: Make install-script wget-compatible (@eval)
  • #1822: type should prioritize :type metadata
  • ns-name should work on symbols
  • :clojure.core/eval-file should affect *file* during eval
  • #1179: run :init in tasks only once
  • #1823: run :init in tasks before task specific requires
  • Fix resolve when *ns* is bound to symbol
  • Bump deps.clj to 1.12.1.1550
  • Bump http-client to 0.4.23

• SCI: Configurable Clojure/Script interpreter suitable for scripting

  • 0.10.47 (2025-06-27)
  • Security issue: function recursion can be forced by returning internal keyword as return value
  • Fix #975: Protocol method should have :protocol var on metadata
  • Fix #971: fix satisfies? for protocol that is extended to nil
  • Fix #977: Can’t analyze sci.impl.analyzer with splint
  • 0.10.46 (2025-06-18)
  • Fix #957: sci.async/eval-string+ should return promise with :val nil for ns form rather than :val <Promise>
  • Fix #959: Java interop improvement: instance method invocation now leverages type hints
  • Bump edamame to 1.4.30
  • Give metadata :type key priority in type implementation
  • Fix #967: ns-name should work on symbols
  • Fix #969: ^:clojure.core/eval-file metadata should affect binding of *file* during evaluation
  • Sync sci.impl.Reflector with changes in clojure.lang.Reflector in clojure 1.12.1
  • Fix :static-methods option for class with different name in host
  • Fix #973: support with-redefs on core vars, e.g. intern. The fix for this issue entailed quite a big refactor of internals which removes “magic” injection of ctx in core vars that need it.
  • Add unchecked-set and unchecked-get for CLJS compatibility

• clerk: Moldable Live Programming for Clojure

  • Make clerk compatible with babashka

• quickblog: light-weight static blog engine for Clojure and babashka

  • 0.4.7 (2025-06-12)
  • Switch to Nextjournal Markdown for markdown rendering The minimum babashka version to be used with quickblog is now v1.12.201 since it comes with Nextjournal Markdown built-in.
  • Link to previous and next posts; see “Linking to previous and next posts” in the README (@jmglov)
  • Fix flaky caching tests (@jmglov)
  • Fix argument passing in test runner (@jmglov)
  • Add --date to api/new. (@jmglov)
  • Support Selmer template for new posts in api/new; see Templates > New posts in README. (@jmglov)
  • Add ‘language-xxx’ to pre/code blocks
  • Fix README.md with working version in quickstart example
  • Fix #104: fix caching with respect to previews
  • Fix #104: document :preview option

• edamame: configurable EDN and Clojure parser with location metadata and more

  • 1.4.31 (2025-06-25)
  • Fix #124: add :imports to parse-ns-form
  • Fix #125: Support #^:foo deprecated metadata reader macro (@NoahTheDuke)
  • Fix #127: expose continue value that indicates continue-ing parsing (@NoahTheDuke)
  • Fix #122: let :auto-resolve-ns affect syntax-quote
  • 1.4.30
  • #120: fix :auto-resolve-ns failing case

• squint: CLJS syntax to JS compiler

  • #678: Implement random-uuid (@rafaeldelboni)
  • v0.8.149 (2025-06-19)
  • #671: Implement trampoline (@rafaeldelboni)
  • Fix #673: remove experimental atom as promise option since it causes unexpected behavior
  • Fix #672: alias may contain dots
  • v0.8.148 (2025-05-25)
  • Fix #669: munge refer-ed + renamed var
  • v0.8.147 (2025-05-09)
  • Fix #661: support throw in expression position
  • Fix #662: Fix extending protocol from other namespace to nil
  • Better solution for multiple expressions in return context in combination with pragmas
  • Add an ajv example

• clj-kondo: static analyzer and linter for Clojure code that sparks joy.
  

  • #2560: NEW linter: :locking-suspicious-lock: report when locking is used on a single arg, interned value or local object
  • #2555: false positive with clojure.string/replace and partial as replacement fn
  • 2025.06.05
  • #2541: NEW linter: :discouraged-java-method. See docs
  • #2522: support :config-in-ns on :missing-protocol-method
  • #2524: support :redundant-ignore on :missing-protocol-method
  • #2536: false positive with format and whitespace flag after percent
  • #2535: false positive :missing-protocol-method when using alias in method
  • #2534: make :redundant-ignore aware of .cljc
  • #2527: add test for using ns-group + config-in-ns for :missing-protocol-method linter
  • #2218: use ReentrantLock to coordinate writes to cache directory within same process
  • #2533: report inline def under fn and defmethod
  • #2521: support :langs option in :discouraged-var to narrow to specific language
  • #2529: add :ns to &env in :macroexpand-hook macros when executing in CLJS
  • #2547: make redundant-fn-wrapper report only for all cljc branches
  • #2531: add :name data to :unresolved-namespace finding for clojure-lsp

• sci.configs: A collection of ready to be used SCI configs.

  • A configuration for replicant was added

• scittle: Execute Clojure(Script) directly from browser script tags via SCI

  • v0.7.23 (2025-06-18)
  • #107: add replicant plugin (@jeroenvandijk)
  • #102: add applied-science/js-interop plugin (@chr15m)
  • #105: add goog.string/htmlEscape (@ikappaki )
  • #113: add unchecked-set and unchecked-get

• nbb: Scripting in Clojure on Node.js using SCI

  • 1.3.204 (2025-05-15)
  • #389: fix regression caused by #387
  • 1.3.203 (2025-05-13)
  • #387: bump import-meta-resolve to fix deprecation warnings on Node 22+
  • 1.3.202 (2025-05-12)
  • Fix nbb nrepl server for Deno
  • 1.3.201 (2025-05-08)
  • Deno improvements for loading jsr: and npm: deps, including react in combination with reagent
  • #382: prefix all node imports with node:

• quickdoc: Quick and minimal API doc generation for Clojure

  • v0.2.5 (2025-05-01)
  • Fix #32: fix anchor links to take into account var names that differ only by case
  • v0.2.4 (2025-05-01)
  • Revert source link in var title and move back to <sub>
  • Specify clojure 1.11 as the minimal Clojure version in deps.edn
  • Fix macro information
  • Fix #39: fix link when var is named multiple times in docstring
  • Upgrade clj-kondo to 2025.04.07
  • Add explicit org.babashka/cli dependency

• Nextjournal Markdown

  • 0.7.186
  • Make library more GraalVM native-image friendly
  • 0.7.184
  • Consolidate utils in nextjournal.markdown.utils
  • 0.7.181
  • Hiccup JVM compatibility for fragments (see #34)
  • Support HTML blocks (:html-block) and inline HTML (:html-inline) (see #7)
  • Bump commonmark to 0.24.0
  • Bump markdown-it to 14.1.0
  • Render :code according to spec into <pre> and <code> block with language class (see #39)
  • No longer depend on applied-science/js-interop
  • Accept parsed result in ->hiccup function
  • Expose nextjournal.markdown.transform through main nextjournal.markdown namespace
  • Stabilize API and no longer mark library alpha

• babashka.nrepl-client

  • Add :responses key with raw responses

• speculative

  • Add spec for even?

• http-client: babashka’s http-client

  • 0.4.23 (2025-06-06)
  • #75: override existing content type header in multipart request
  • Accept :request-method in addition to :request to align more with other clients
  • Accept :url in addition to :uri to align more with other clients

• unused-deps: Find unused deps in a clojure project

  • This is a brand new project!

• fs - File system utility library for Clojure

  • #147: fs/unzip should allow selective extraction of files (@sogaiu)
  • #145: fs/modified-since works only with ms precision but should support the precision of the filesystem

• cherry: Experimental ClojureScript to ES6 module compiler

  • Fix cherry.embed which is used by malli

• deps.clj: A faithful port of the clojure CLI bash script to Clojure

  • Released several versions catching up with the clojure CLI

Other projects

These are (some of the) other projects I’m involved with but little to no activity happened in the past month.

Oleksandr Yakushev

2025 Annual Funding Report 3. Published July 5, 2025.

Hello friends! Here’s the May-June 2025 for my Clojurists Together work!. I’ve been focusing on CIDER during these two months, so all updates are related to it:

• New hexdump inspector view for displaying byte arrays.
• New diff inspector view for inspecting differences in nested data structures.
• Small inspector improvements (map sorting, display class flags)
• Reduced the instrumentation footprint of CIDER debugger, which allows debugging larger functions.
• Reworked approach to enabling 3rd-party pretty-printers.
• Completed the transition from enrich-classpath to cider-download-java-sources for accessing 3rd-party Java sources.
• All changes are already in the rolling CIDER version, the stable version will be released shortly.
• Auxiliary releases: cider-nrepl 0.55.7 -> 0.57.0, Orchard 0.34.3 -> 0.36.0.
  

Peter Taoussanis

2025 Annual Funding Report 3. Published July 1, 2025.

A big thanks to Clojurists Together, Nubank, and other sponsors of my open source work! I realise that it’s a tough time for a lot of folks and businesses lately, and that sponsorships aren’t always easy 🙏

- Peter Taoussanis

Hello from sunny Berlin! 👋 🐝 🫶

Recent work

Introducing Trove

First up, a new micro library! It’s called Trove, and it’s basically a modern minimal (~100 loc) tools.logging that adds support for ClojureScript, structured logging and filtering.

Who’s this for?

Mostly library authors that want to do library-level logging without forcing a particular logging library on their users.

Authors could use tools.logging, but that doesn’t support ClojureScript, structured logging, or the kind of data-oriented filtering possible with structured logging.

Motivation

With Telemere now stable, I wanted to start updating libraries like Sente and Carmine to support structured logging.

Trove basically allows me to do this without forcing anyone to update if they’d rather stick with Timbre or use an alternative like μ/log.

Why structured logging?

Traditional logging is string oriented. Program state is captured at the logging callsite, then generally formatted into a message string or serialized into something like EDN/JSON before hitting the rest of the logging pipeline (filters → middleware → handlers).

Structured logging is data oriented. Program state is captured at the logging callsite, then retained as-is through the rest of the logging pipeline (filters → middleware → handlers).

The data-oriented approach means that:

• No expensive formatting or serialization are needed.
• Exact data types and (nested) data structures are losslessly retained throughout the logging pipeline.

The latter matters! It means that it’s easy and cheap to build a rich pipeline that can do data-oriented filtering, analytics, aggregations, transformations, and final handling (e.g. your DB or log aggregator might itself support rich types).

Clojure loves plain data and offers a rich set of data types, structures, and tools. Structured logging takes advantage of this. It’s essentially the extension of the data-first principle to the way we instrument our programs.

A big Sente update

Sente has a major new pre-release out.

There’s a lot of significant improvements in here. Some highlights include:

• Added support for upcoming high-speed binary serialization
• Added support for compression
• A smaller dependency
• Improved reliability under heavy load
• Pluggable logging (via Trove)
• Many other small fixes and improvements

Tufte v3 final

Tufte’s official v3 release is out.

There’s many big improvements, including many new features shared with Telemere, and new handlers for Telemere and Trove.

Other stuff

Other misc releases include:

• Nippy v3.6.0
• Telemere v1.0.1
• Timbre v6.7.1

Upcoming work

Next couple months I expect to focus on:

• Getting Sente v1.21 final released, ideally with an official binary serialization mode
• Getting Tempel v1 final released (sorry about the delays!)
• Getting http-kit updated (lots of cool stuff pending there)

Cheers everyone! :-)