Release Scala 2.13.17 · scala/scala The Scala team at Akka is pleased to announce Scala 2.13.17. This release is compatible with the new JDK 25 LTS. The following are highlights of this release: Compatibility JDK 25 support in optim...

Scala 2.13.17 is here! It improves compatibility with JDK 25 LTS, supports Scala 3.7, improves Scala 3 compatibility and migration, and more.

It also has a few minor potentially breaking changes.

For details, refer to the release notes on GitHub: github.com/scala/scala...

(2/2) > With these new features, Wasm has much better support for compiling high-level programming languages. Enabled by this, we have seen various new languages popping up to target Wasm, such as Java, OCaml, Scala, Kotlin, Scheme, or Dart, all of which use the new GC feature.

Wasm 3.0 Completed - WebAssembly WebAssembly (abbreviated Wasm) is a binary instruction format for a stack-based virtual machine. Wasm is designed as a portable compilation target for programming languages, enabling deployment on the web for client and server applications.

Wasm 3.0 is completed, with major new features like GC and exception handling! Scala is now acknowledged as a language that compiles to WebAssembly 🚀
webassembly.org/news/2025-0...
(1/2)
#Wasm #Scala

“WASM 3.0 completed”

#Scala mentioned ❤️

https://webassembly.org/news/2025-09-17-wasm-3.0/

Announcing Scala.js 1.20.1 Harness the Scala and JavaScript ecosystems to develop robust apps for browsers, serverless, and Node.js.

#Scala.js 1.20.1 is released! It features a number of performance improvements, both for the JavaScript and WebAssembly backends. www.scala-js.org/news/2025/09...

Oleg's Twitter picture.

Oleg's LinkedIn picture.

I found out from LinkedIn that Oleg Pyzhcov (oleg-py) may have died in his apartment in Sep 2022.

I knew him as a very talented developer, a prolific Monix and Scala contributor, a kind and helpful person and a friend. He was too young.

Published a new blog post: Golden Literal Testing in uTest 0.9.0 www.lihaoyi.com/post/GoldenL...

Since introducing Wasm support in Scala.js 1.17.0, there's been significant optimization of the Wasm backend! 🚀 The latest 1.20.0-SNAPSHOT, benchmarked against the 1.17.0 baseline, shows impressive progress: brainfuck +90% and kmeans +83%. Excited to see the evolution of Scala.js Wasm! #scala #wasm

Scala 3.7.0 has been released! 🎉

✅ [stable] SIP-58: Named Tuples
✅ [stable] SIP-52: Binary APIs
👀 [preview] SIP-62: For comprehension improvements
🧪 [experimental] SIP-61: Unroll
🧪 [experimental] SIP-68: Reference-able Package Objects

More at scala-lang.org/news/3.7.0/

Gradle, Inc. Joins Scala Center Advisory Board to Improve Scala Developer Experience

"Scala devs deserve the same productivity support as the rest of the JVM world. By joining the Scala Center Advisory Board, we’ll help identify pain points and bring better tools to the community." —Hans Dockter, Gradle CEO

scala-lang.org/blog/gradle-...

The JSPI support is IMO a game changer. As long as you enter a js.async{...} block, you can *synchronous await* a JS Promise *anywhere* with js.await(p)! That has never been possible on the JS platform. I can't wait to see what libraries will be built on top of this new superpower.

Announcing Scala.js 1.19.0 Harness the Scala and JavaScript ecosystems to develop robust apps for browsers, serverless, and Node.js.

#Scala.js 1.19.0 is released! It contains significant performance improvements for the WebAssembly backend (it is now often faster than JS), native support for JS async/await, and a way to leverage Wasm's JavaScript Promise Integration (JSPI). Read more at www.scala-js.org/news/2025/04...

A screenshot of the waypoints demo.

🕹️ Indigo 0.20.0 is out!

Many thanks to the contributors involved in this release! A small smorgasbord of quality of life improvements and a wacky Waypoints demo. What's not to love?

github.com/PurpleKingdo...

#Scala

🗓️ The #ScalaDays CfP CLOSES in just a few days. By submitting a proposal, you're not only in great company but you have the chance to share your experience in Scala's hometown of Lausanne, on the EPFL campus.

Share the word & apply today 👇🏼
www.papercall.io/sca...

Laminar v17.2.1 · Laminar Airstream bug fixes!

Laminar & Airstream 17.2.1 bug fix release laminar.dev/blog/2025/03... #Scala

Evolving Scala

New blog post from Haoyi Li and myself: www.scala-lang.org/blog/2025/03...

Looking forward to discuss this on reddit www.reddit.com/r/scala and at the upcoming Scalar conference www.scalar-conf.com.

Come and join the fun! I'll be working on improvements to Indigo's new UI system. Wanna help?

How do GUI/UI systems even work in FP languages like #Scala? Only one way to find out... 😇

📣 Super Early Bird tickets are now on sale

🏃🏻 Act now, prices go up on April 4th

🎟️ Get your tickets today at register.event-works.com/lausanne/Sca...

Did you know, the CfP for this year’s conference is OPEN. Send in your proposal today and be part of this year’s event in Lausanne, Switzerland!

✍🏼 www.papercall.io/scaladays

All levels of expertise on Scala and its application are welcome and encouraged 👍🏼

With AST seemingly explorer not maintained, I decided to try and implement it in Scala.js.

Lots of fun, until I hit several recursion bugs in my interval tree implementation, and it was hell from that point onwards.

This will soon be hosted under Scalameta org and website.

Add Support for Wasm Component Model and WASIp2 · Issue #5121 · scala-js/scala-js PoC design and implementation: #5121 (comment) Background This issue is kinda part of #4991 to support "server-side Wasm" To support "server-side Wasm", we have to remove all th...

(3/3) Interested in updates? See how Wasm interface types are mapped in Scala and check out the details here: github.com/scala-js/sc... github.com/scala-js/sc...

We're working on directly emitting Wasm Component Model & WASI Preview 2 binary, aiming to support "server-side Wasm".It's still a PoC, and the API will probably change, but… we can now call Rust functions from Scala! (1/3)
#scala #wasm #wasi

A color palette rendered using the UI system via the roguelike starterkit.

Indigo's UI system is dead. Long live the UI system!

The UI system released last month did not survive first contact with the real world, and has been overhauled.

New releases of all Purple Kingdom Games #Scala libs, containing the revised UI and many other improvements, are now available.

PaperCall.io - Scala Days 2025 ## The 12th edition of Scala Days will take place at: **Lausanne, Switzerland**, August 19th to 21st, 2025 For over twelve years, Scala Days has been the premier global event for Scala developers, in...

CfP is now open

👀 Scala foundations, libraries, tooling, industrial adoption, community, LLM, and more — all experience levels welcome.

Submit your idea, share with colleagues, or encourage new speakers to give it a try!

Apply by April 6th 👉
www.papercall.io/scaladays

JDK 17 will be the next minimum version required by Scala 3

Scala 3 will require JDK 17+, starting from Scala 3.8. This will enable the compiler and ecosystem to move faster and leverage new features and APIs. The decision is in line with similar decisions happening around the whole JVM world. Read about it at www.scala-lang.org/news/next-s...

Rock the JVM partners with the Scala Center

🤝 Rock The JVM x Scala Center

🎓 @rockthejvm.bsky.social Scala courses are now officially recommended on Scala-lang!

🌟 PLUS, 30% of revenue from course purchases goes to the Scala Center to support the Scala community!

www.scala-lang.org/blog/2025/02...

Announcing Scala Days 2025

Time to meet again 🥰

🙌 Scala Days 2025
🗓️ 19-21 August 2025
📍Lausanne, Switzerland

🌐 Business-driven
♥️ Community-infused
🦸 Family-friendly

Looking forward to welcoming you in August!

scala-lang.org/blog/2025/02...

RFC: Deprecate support for ECMAScript 5.1. by sjrd · Pull Request #5128 · scala-js/scala-js That support is the biggest source of alternative code paths and polyfills in our codebase. The polyfills and other alternative implementations we need to support ES 5.1 include: Math.fround to su...

RFC: We intend to deprecate support for ECMAScript 5.1 in the next version of #Scala.js. If you are still relying on it, please weigh in on the PR and tell us why. The default has been ECMAScript 2015 since Scala.js v1.0.0. github.com/scala-js/sca...

The first edition recaps 2024’s biggest advancements:
✅ Named tuples in Scala 3
✅ Experimental WebAssembly backend in Scala.js
✅ Scala CLI as the new default runner for Scala
✅ Scala 3 build definitions in sbt 2.x (beta)
✅ Better Scala 3 support in IntelliJ Scala Plugin
… and much more!

Scala Highlights from 2024

🚀 Introducing Scala Highlights – a new quarterly newsletter!
Read it now 👉 scala-lang.org/highlights/2...