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Mateusz Kubuszok

@kubuszok.com

Hearth Core Macro Hacker Blog @ https://kubuszok.com JVM-Scala Book @ https://leanpub.com/jvm-scala-book Chimney @ https://chimney.scalaland.io

54 Posts219 Follower63 Folgt
Matej Cerny@matejcerny.bsky.social · 3d ago

There is a new #Scala 3 optics library worth checking out: cats-eo. It unifies optic families under a single trait, features macro derivation backed by Hearth and delivers massive performance gains (such as traversals running up to 11x faster compared to Monocle).

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Mateusz Kubuszok@kubuszok.com · 3w ago

This migration was an opportunity to benchmark the compilation and improve a thing or 2 in Hearth, so we're dropping new releases of: Hearth: github.com/kubuszok/hea... Kindlings: github.com/kubuszok/kin...

Release 0.4.1 - Compile-Time Performance, 30+ Fixes, and copyMethod / Expr.annotated / Type.Lazy APIs · kubuszok/hearth

0.4.1 is a polish and quality-of-life release. Chimney is now Hearth-powered — and it got there on 0.4.0, without waiting for anything in this release; where it met a rough edge it simply worked ar...

github.com

Mateusz Kubuszok@kubuszok.com · 3w ago

New Chimney(s) dropped: 1.x line supporting 2.12/2.13/3.3: github.com/scalalandio/... and 2.0.0-M4 supporting 2.13/3.8 freshly migrated to Hearth: github.com/scalalandio/...

Mateusz Kubuszok@kubuszok.com · last mo.

Hearth 0.4.0 once again is pushing the limits of what you can do with macros (without going insane): - reworked method callers that could let you build every call - expression destructuring enabling quicklens-like patterns - creating anonymous instance of an arbitrary type

Mateusz Kubuszok@kubuszok.com · 2mo ago

There was no e-mail, and I learned it by accident, but I feel all #Scala OSS devs should learn ASAP: Maven is introducing publishing limits. We most likely will have to apply for exemption: - www.sonatype.com/blog/open-pu... - central.sonatype.org/publish/mave...

Open Publishing, Commercial Scale

Open source registries are evolving for commercial-scale use. Learn why Maven Central publishing limits aim for open access and sustainable infrastructure.

sonatype.com

Mateusz Kubuszok@kubuszok.com · 2mo ago

Today we managed to push out Hearth 0.3.1 with support for evaluating Expr values without an actual compilation (semiEval). github.com/kubuszok/hea...

Release 0.3.1 - Expr.semiEval, Type.CtorK1, JDK Futureproofing, and a New Logo · kubuszok/hearth

The 0.3.1 release adds a few things to the 0.3.x line, that I didn't waned to wait with, but also ones that should not break existing libraries based on 0.3.0. (More exciting things to come in 0.4....

github.com

Matej Cerny@matejcerny.bsky.social · 4mo ago

Hearth aka the Scala unified macro for 2.13 and 3 has a new version out! 🎉 I'm definitely no macro expert, so go read the changelog yourself to see all the magic. 🪄 It's huge! github.com/kubuszok/hea... #scala

Release 0.3.0 - Standard Extensions, Union Types, Rules, Flame Graphs, MIO Timeouts, hearth-munit, and Much More · kubuszok/hearth · GitHub

This is the biggest Hearth release so far: a major feature release that introduces Standard Extensions — a pluggable type-inspection framework — along with union types support, rule-based derivatio...

github.com

Mateusz Kubuszok@kubuszok.com · 4mo ago

I wanted to release Hearth 0.3.0 after Scala 3.3.8 is out, and Kindlings 0.1.0 after that. But overwhelmingly positive reception (and a horse head in my bed) convinced my to release them much earlier, so...

Mateusz Kubuszok@kubuszok.com · 5mo ago

Last week I went out for a Friday night beer with friends, and left Claude running. After recent batches of improvements I hoped that Hearth was finally at the stage when I would be able to write a whole type class derivation with no bugs in my macro utilities. #scala #macros

Mateusz Kubuszok@kubuszok.com · 6mo ago

Claude just finished writing me a sbt codegen, which generates >17 000 lines of code of macros and compiler plugins... which would be expanded in other macros to provide cross-compilable type constructor representation. When I started Hearth I didn't expect to go so meta

Scala Days@scaladays.org · 8mo ago

🔍 A thoughtful, down-to-earth look at what a shared macro library could mean for Scala developers. Here’s "Can we have the Standard Library for Macros?" by Mateusz Kubuszok

Mateusz Kubuszok: Can we have the Standard Library for Macros? [Scala Days 2025]

Do you like it when compiler generates the boring code for you? Fast, mundane, boring-but-error-prone code? Do you need to implement such a code generator yourself? Have you found out that Shapeless/Mirrors bend your brain a bit too much? Congratulations! You might have a valid use case for writing

youtube.com

The Scala Programming Language@scala-lang.org · 8mo ago

🔍 A thoughtful, down-to-earth look at what a shared macro library could mean for Scala developers. Here’s "Can we have the Standard Library for Macros?" by Mateusz Kubuszok

Mateusz Kubuszok: Can we have the Standard Library for Macros? [Scala Days 2025]

Do you like it when compiler generates the boring code for you? Fast, mundane, boring-but-error-prone code? Do you need to implement such a code generator yourself? Have you found out that Shapeless/Mirrors bend your brain a bit too much? Congratulations! You might have a valid use case for writing

youtube.com

Mateusz Kubuszok@kubuszok.com · 9mo ago

Hearth 0.2.0 just dropped continuing the quest for user-friendly macros. #scala #macros github.com/MateuszKubus...

Release 0.2.0 - Overall improvements, ValDefs builders and cache, Better Printers, more robust Cross Quotes and More · MateuszKubuszok/hearth

This release delivers the full scope planned for the 0.2.x milestone: refining everything introduced in 0.1.0, strengthening stability, improving ergonomics, and expanding documentation and tooling...

github.com

Mateusz Kubuszok@kubuszok.com · 10mo ago

Chimney 2.0.0-M2 for 2.13.17+ and 3.7+ just landed! * sanely-automatic derivation backported to 2.13 * aligned with featues/bugfixes up till 1.8.2 Try out, if you had any issues with semiauto on Scala 3.7 or if you want to test sanely-auto on 2.13! github.com/scalalandio/...

Release v2.0.0-M2 · 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