09 June 2026
Christoph Neumann
Welcome to the Clojure Deref! This is a weekly link/news roundup for the Clojure ecosystem (feed: RSS).
Less than one week to submit a talk for the 2026 Clojure/Conj. Don’t miss your chance!
Clojure/Conj 2026 is Sep 30 - Oct 2 in Charlotte, NC, USA.
Squint added a browser REPL. Go beyond hot-reloading your Squint code. Now you can eval on the live page over nREPL. Try it out!
Jolt takes SCI to new places: the Janet runtime. If you like Janet’s lightweight runtime, but you want a full Clojure dialect, you might be interested in trying the early version.
Do you want to run Clojure in outer space? Why not fly it there yourself? Check out sfsim. It aims to be a realistic 3D space flight similator. See if you can take off, orbit the planet, make it home safe, and live to code another day.
Who needs Twitch when you can just stream your terminal to the web? Try Atomstream. To use it, swap out charm.clj, launch your application in the terminal, and watch all your TUI goodness dance before your eyes in the browser.
Clojure/Conj 2026: Sep 30-Oct 2. Charlotte, NC, USA. CFP is open until June 14. Early Bird tickets.
EuroClojure 2027: May 19-21, 2027. Prague, Czech Republic. Join the mailing list
Announcing Atomstream - Kyle S Passarelli
Clojure If Do When - Mike Møller Nielsen
Demo: See the Hiccup source for any UI element - Patrick de Kruif
Swish: Using Claude Code to Create a Lisp in Swift - lazy seqs & more - Rod Schmidt
Apropos with Adrian Smith June 9, 2026 - apropos clojure
Improving the performance of the popular Clojure development tool clojure-lsp - Sashko Yakushev
The perils of UUID primary keys in SQLite - Anders Murphy
A Bidirectional Source Inspector for Server-Rendered Hiccup - Patrick de Kruif
New library: biff.core - Jacob O’Bryant
Thanks OSS Award given to Clojure MCP and next.jdbc - Toyokumo
Imagine a Difference You Could Trust - Juan Antonio Ruz
We Built a Custom Workflow with the Buffer API — and Tripled Our X Impressions - Anthony Franco
Debut release
jolt - A Clojure interpreter running on Janet
sfsim - Space flight simulator (under development)
magit-difftastic - Integrate difftastic into magit
atomstream - Cross-render TUIs to the Web
transit.c - A data interchange format and set of libraries for conveying values between applications written in different programming languages.
kontor - A trans-national accounting kernel with modules for all business aspects.
parens-to-production - How to build your next Clojure application with SSR with Datomic
jon-nested-menu - Nested MUI menus for Reagent/ClojureScript and React: a dropdown, a right-click context menu, per-item icons, custom labels and keyboard navigation.
biff.core - Defines the interfaces and code that connect all the other Biff libs
Updates
core.async 1.10.874-alpha3 - Facilities for async programming and communication in Clojure
tools.deps.edn 0.9.38 - Reader for deps.edn files
spel 0.9.8 - Idiomatic Clojure wrapper for Playwright. Browser automation, API testing, Allure reporting, and native CLI - for Chromium, Firefox, and WebKit
ansatz 0.1.22 - Dependently typed Clojure DSL with a Lean4 compatible kernel.
guardrails 1.3.3 - Efficient, hassle-free function call validation with a concise inline syntax for clojure.spec and Malli
fulcro-tui 1.0.2 - A JLine-base TUI wrapper, allowing you to write TUI projects in CLJ or Babashka via Fulcro
fulcro-rad-tui 1.0.0-RC2 - UI Plugin for Terminal UI support in Fulcro RAD (fulcro-rad-statecharts)
calva 2.0.590 - Clojure & ClojureScript Interactive Programming for VS Code
clj-tg-bot-api 1.2.266 - 🤖 The latest Telegram Bot API spec and client lib for Clojure-based apps
aleph 0.9.9 - Asynchronous streaming communication for Clojure - web server, web client, and raw TCP/UDP
rephrase 1.0.3 - Rephrase exceptions to be more beginner-friendly
c4k-keycloak 2.1.0 - a kubernetes deployment for keycloak
phel-lang 0.42.0 - A functional, Lisp-inspired language that compiles to PHP. Inspired by Clojure, Phel brings macros, persistent data structures, and expressive functional idioms to the PHP ecosystem.
awesome-backseat-driver 1.0.15 - Plugin marketplace for Clojure AI context in GitHub Copilot: agents, skills, and workflows for REPL-first interactive programming with Calva Backseat Driver
diehard 0.12.1 - Clojure resilience library for flexible retry, circuit breaker and rate limiter
calva-backseat-driver 0.0.35 - VS Code AI Agent Interactive Programming. Tools for CoPIlot and other assistants. Can also be used as an MCP server.
teensyp 0.6.0 - A small, zero-dependency Clojure TCP server that uses Java NIO
pg-datahike 0.1.44 - Postgres compatibility layer for Datahike.
cli-tools 1.0.0 - CLIs and subcommands for Clojure or Babashka
svar 0.7.11 - Type‑safe LLM output for Clojure. Works with any text‑only model.
yggdrasil 0.2.28 - Git-like, causal space-time lattice abstraction over systems supporting this memory model.
spindel 0.1.18 - Cross-platform FRP runtime with a git-like memory model.
