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Mateusz Kubuszok @kubuszok.com · 9d

The first release is done, better macros are possible

github.com/MateuszKubus...

Release 0.1.0 - Inintial release · MateuszKubuszok/hearth

It took longer than I hoped but 0.1.0 is live and with some scaffolded documentation. There are some gaps in the documentation, e.g. no examples for utilities usage, no mention of sources and debug...

github.com

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Reposted by Mateusz Kubuszok

Scala.IO @scalaio.bsky.social · 17d

Can we have the Standard Library for Macros? (@kubuszok.com): makes simple things simple, and hard things (at least) possible 🚀

Event Sourcing is just a foldLeft on Events and a decide function! Or is it? (Matthieu Baechler & Thomas Hilaire): master of immutability but UPDATE db all day long ? 👀

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Mateusz Kubuszok @kubuszok.com · Aug 21

Thank you everyone who came to my talk at @scaladays.org ! It was amazing to be here!

You can find my slides at mateuszkubuszok.github.io/ScalaStandar...

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Mateusz Kubuszok @kubuszok.com · Aug 10

That #Scala code does something, that many considered impossible. Could you guess why?

github.com/MateuszKubus...

hearth/hearth-tests/src/main/scala/hearth/demo/ShowMacrosImpl.scala at f4b7828eaecd6b154514832a51b1756f6a29fd37 · MateuszKubuszok/hearth

The first Scala macros' standard library. Contribute to MateuszKubuszok/hearth development by creating an account on GitHub.

github.com

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Mateusz Kubuszok @kubuszok.com · Jul 25

Feedback reaches authors faster when they don't have to use a mix of "search by string in random social media" (no mentions, hashtags, etc) combined with Google Translate :P

Discussions, issues and PRs are welcome at github.com/scalalandio/...

GitHub - scalalandio/chimney: Scala library for boilerplate-free, type-safe data transformations

Scala library for boilerplate-free, type-safe data transformations - scalalandio/chimney

github.com

Mateusz Kubuszok @kubuszok.com · Jul 16

If you're missing some feature in Chimney - contribute it!

github.com/scalalandio/...

The future of Chimney · scalalandio chimney · Discussion #762

TL;DR - I intent to develop only what is necessary to keep the library working (when changes in the compiler would make the currently working code make it no-longer working code, like with 3.7-give...

github.com

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Mateusz Kubuszok @kubuszok.com · Jul 16

Some time ago I made a presentation that wasn't recorded...

But at least some of the points from it could be showcased with this gist

gist.github.com/MateuszKubus...

Newtypes and tagged types

Newtypes and tagged types. GitHub Gist: instantly share code, notes, and snippets.

gist.github.com

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Mateusz Kubuszok @kubuszok.com · May 30

It seems #Scala folks are interested in macros once more!

So, let's meet at the @scaladays.org 2025 to talk why we would want some standard library for them and how!

Scala Days 2025
Can we have the Standard Library for Macros
Mateusz Kubuszok
8.21.2025 | Track 4, 11am, Hall 1

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Mateusz Kubuszok @kubuszok.com · May 21

I had hardly any exposure to Apache Spark, and Databricks is mostly irrelevant to me...

Still I am curious why nobody in my circle noticed that Databricks released runtime for Scala 2.13. Now only sbt is the reason to keep publishing for 2.12
docs.databricks.com/aws/en/relea...

Databricks Runtime 16.4 LTS | Databricks Documentation

Release notes about Databricks Runtime 16.4 LTS, powered by Apache Spark.

docs.databricks.com

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Reposted by Mateusz Kubuszok

Scala Space @scalaspace.bsky.social · May 13

🚀 Metals v1.5.3 is here!

Introducing:
- MCP server support for AI agents
- new inlay hints for named/by-name parameters
-improved test discovery for ZIO
- better auto-fill arguments
- using directives worksheet support.

Try it now! #Scala #IDE

scalameta.org/metals/blog...

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Mateusz Kubuszok @kubuszok.com · May 8

Since we had to make a new major - and we would have to maintain 2 major versions for a while - we made some cleanups in 2.x and refactors in 1.x. You find 1.x changes in 1.8.0.

github.com/scalalandio/...

Release v1.8.0 · scalalandio/chimney

Important Since Chimney got affected by 3.7.0 change in givens resolution we had to analyze the possible ways of fixing the issue. While there is a temporary workaround the proper fix requires rele...

github.com

Mateusz Kubuszok @kubuszok.com · May 8

If you've been affected by Scala 3.7.0 given resolution change, and Chimney started failing in some case - try out 2.0.0-M1.

github.com/scalalandio/...

Release v2.0.0-M1 · scalalandio/chimney

Important Since Chimney got affected by 3.7.0 change in givens resolution we had to analyze the possible ways of fixing the issue. While there is a temporary workaround the proper fix requires rele...

github.com

1

Reposted by Mateusz Kubuszok

Scalar @scalar-conf.com · Apr 14

Slow-Auto, Inconvenient-Semi: escaping false dichotomy with sanely-automatic derivation by @kubuszok.com

Subscribe to our our YouTube channel so you don't miss the rest of #scalarconf videos.

Slow-Auto, Inconvenient-Semi: escaping false dichotomy with sanely-automatic derivation

YouTube video by SoftwareMill

www.youtube.com

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Reposted by Mateusz Kubuszok

Matej Cerny @matejcerny.bsky.social · Apr 11

Really interesting comparison between automatic vs. semi-automatic type class derivation and their impact on performance. #scala https://youtu.be/M54ux51H6Fo

Slow-Auto, Inconvenient-Semi: escaping false dichotomy with sanely-automatic derivation

youtu.be

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Reposted by Mateusz Kubuszok

Scala Space @scalaspace.bsky.social · Apr 10

As promised we are working hard on providing you with the Scala MCP server, we already have a WiP pull request ready and some courageous souls are actually testing it!

You can take a look and already give some feedback at github.com/scalameta/m...

WIP: MCP support by kasiaMarek · Pull Request #7390 · scalameta/metals

resolves: scalameta/metals-feature-requests#430

github.com

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Reposted by Mateusz Kubuszok

Scala Space @scalaspace.bsky.social · Apr 2

With our new Scala MCP server we are able to eliminate hallucinations and unproductive guesswork for code that LLMs aren't familiar with by exposing API shapes from the caches of Metals and the Scala compiler.

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Mateusz Kubuszok @kubuszok.com · Mar 29

I am back home! But I took a bit of Scalar with me :)

Mateusz Kubuszok @kubuszok.com · Mar 28

Thank you @scalar-conf.com for yet another amazing conference and for having me there! See you next year!

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Mateusz Kubuszok @kubuszok.com · Mar 15

Scala 3.7.0-RC1: Expr.summonIgnoring works! (vide github.com/scala/scala3...)

I updated my benchmarks, now I'll have to update my slides for Scalar

Proposal: Add Expr.summonIgnoring method to use in macros · scala scala3 · Discussion #21909

Motivation: Typeclass derivation libraries have long been using the implicit resolution feature in scala. It: allows for easier developer experience where derivation library designers are able comp...

github.com

3

Reposted by Mateusz Kubuszok

Scala Space @scalaspace.bsky.social · Feb 20

Scala Projects Maintenance Survey results, still fresh from the oven are there! With over 100 responses from tech leaders and managers from our community to shed some light on how Scala fares. (1/4)

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Mateusz Kubuszok @kubuszok.com · Jan 23

Chimney 1.7.0 with:
- transformation from more than 1 value
- recursive Patchers
- and much more!

Easily one of top 3 Chimney releases (next to 0.8.0 - with Scala 3 support - and 1.0.0 - with stable API)

github.com/scalalandio/...

Release v1.7.0 · scalalandio/chimney

This big release bring some long-awaited features: transformations, which take more than 1 case class as input (well, not only case classes 😄 ) and improved Patchers which handle: recursive patchin...

github.com

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Mateusz Kubuszok @kubuszok.com · Jan 23

Thanks!

Mateusz Kubuszok @kubuszok.com · Jan 23

- I wonder why these functionalities takes them so long, it's just a few simple changes
- a few simple changes: github.com/scalalandio/...

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Mateusz Kubuszok @kubuszok.com · Dec 31

Chimney 1.6.0 with some QoL improvements! github.com/scalalandio/...

Release v1.6.0 · scalalandio/chimney

Changelog: now we are testing that macros in Scala 2.13 can read Scala 3 code and vice versa - while people might take it for granted, there are some differences in AST between both versions so s...

github.com

Mateusz Kubuszok @kubuszok.com · Dec 16

I looked at my OSS Sonatype stats.

About 1/2 of Chimney users on 2.12 and 1/3 users on 2.13 is still on using 0.6.2 or older.

When I look up these on GH, I often find projects which are still maintained and update all the other dependencies. I wonder why they skip Chimney.