What's Changed

• Add support for generating dynamic hint bindings in #1816
• codegen: Allow alloy.openapi.* namespaces by default #1822
• Properly encode special characters when converting HttpUri to Java URI #1832

Other changes

• Library updates 2025.08 by @kubukoz in #1803
• Update weaver to 0.10.0 by @majk-p in #1823
• Scala 2 Kind Projector underscore-placeholders flag support by @pomadchin in #1831
• add in scripted test for refinement usage by @yisraelU in #1836

New Contributors

• @pomadchin made their first contribution in #1831

Full Changelog: v0.18.42...v0.18.43

What's Changed

• Fix for hints in union->unit case by @yisraelU in #1808

Additional changes

• Json union benchmarks by @msosnicki in #1798
• Add some starting CONTRIBUTING.md docs by @kubukoz in #1796

Full Changelog: v0.18.41...v0.18.42

What's Changed

• http4s: Revert the default behavior of URL path encoding (broken in 0.18.40) in #1793
• codegen: Avoid collision with Schema.* methods in certain cases of ADT unions in #1789

Other changes

• Add missing closing tags for admonitions, fix diff highlight by @kubukoz in #1785

Full Changelog: v0.18.40...v0.18.41

⚠️ WARNING ⚠️ - behavior change

This release includes a change to the default behavior of HTTP clients - we improved our compliance with Smithy's standard on path-encoding, but we accidentally changed the default behavior instead of making it opt-in, in #1668.

See #1792 for more detail.

What's Changed

• codegen: Add support for bincompat-friendly code generation mode in #1737 + #1780.
• core: fix #1663 by reworking how path segments are encoded to conform with the Smithy spec in #1668
• aws-http4s: fix AWS request signing for URIs with encoded path segments in #1668
• json: support open lenient unions, fix #1713 in #1782

Other changes

• Run protocol publishLocal with a cache by @kubukoz in #1783

Full Changelog: v0.18.39...v0.18.40

What's Changed

• http4s: Partially fix #1619 by checking request query parameters against the static query parameters in #1743
• http4s: fix #1567, fix #1753 by sorting the endpoints according to Smithy's URI pattern specificity rules in #1766
• http4s: always set JSON maxArity to Int.MaxValue on the client side, as this mechanism was intended to protect server-side and is very detrimental to clients - in #1770, #1773
• codegen: Add HTTP method and pattern to Scaladoc (fixes #728) in #1764
• all: Move publishing to Sonatype Central in #1769, #1775
• all: Switch back to the com.disneystreaming org for Alloy/smithy-translate in #1771
• docs: Add warning about mill plugin for 0.12 in #1757

Other changes

• add upgrade warning regarding Alloy org change by @yisraelU in #1768
• Update website dependencies by @kubukoz in #1758
• treewide: format Smithy files by @kubukoz in #1761

New Contributors

• @Odomontois made their first contribution in #1743
• @tpetillot made their first contribution in #1766

Full Changelog: v0.18.38...v0.18.39

WARNING ⚠️

This release includes a version of Alloy which is published under io.github.disneystreaming. As a result, new and old versions of Alloy don't get deconflicted by dependency resolution, and can cause conflicts/errors in Smithy's model loading. We've reverted this change already, and it's going to be rolled out in smithy4s 0.18.39.

What's Changed

• Update CLI instructions by @kubukoz in #1746
• [http4s] add onError method by @yisraelU in #1755
• Fix Hints methods to distinguish member and target hints by @Jay-Lokhande in #1756
• Add fromStringOrUnknown and fromIntOrUnknown to Open Enums by @Jay-Lokhande in #1759
• bump alloy and smithy translate by @yisraelU in #1765

New Contributors

• @Jay-Lokhande made their first contribution in #1756

Full Changelog: v0.18.37...v0.18.38

What's Changed

• json: Allow decoding nulls for optional fields in defaults (fixes #1581) in #1744
• codegen: Fix generating empty defaults on blob shapes in #1744
• http: Add mapping between HttpUri and java.net.URI in #1719
• codegen: Add an STDERR log message when a codegen-time model transformation is requested but not found in #1726
• codegen: Don't generate code for mixins that aren't structs in #1445
• mill-plugin: Add support for 0.12 in #1728
• http: fix uri encoding issue for conversion to java.net.URI in #1733

Other changes

• Cleanup some warnings by @kubukoz in #1727
• Use TopDownIndex to gather service operations from resources by @kubukoz in #1722
• Add missing changelog entries by @kubukoz in #1732
• Render string literals using renderStringLiteral by @kubukoz in #1738
• Update weaver-cats, weaver-scalacheck to 0.9.0 by @kubukoz in #1741
• Update alloy-openapi, alloy-protobuf, ... to 0.3.20 by @kubukoz in #1742
• Update sbt-scalafix to 0.14.3 by @kubukoz in #1740
• Update sbt-bloop to 2.0.10 by @kubukoz in #1739

Full Changelog: v0.18.36...v0.18.37

This release fixes a long-standing bug in class loading performed as part of the codegen process (#336).

What's Changed

• codegen: Pass the correct ClassLoader to prevent validators/transformers from breaking on externally-defined trait classes in #1709

Internal changes

• Increase CodeHeap for non-profiled methods in .sbtopts.example by @ghostbuster91 in #1710
• Fix a test that passes for the wrong reason by @kubukoz in #1715
• Remove unused fs2 module by @kubukoz in #1714

Full Changelog: v0.18.35...v0.18.36

What's Changed

• json, documents: Add support for @jsonUnknown in unions (Open Unions) in #1677

This change enables the use of open unions - check out the documentation to learn more!

• codegen: Prevent StackOverflowError in dealing with recursive collection traits in #1708

Additionally, this change has been reported to increase codegen performance - on some codebases, reaching up to 55% of a reduction in generation times.

Full Changelog: v0.18.34...v0.18.35

What's Changed

• codegen-cli: Ensure the command returns a failing exit code if command line arguments aren't valid in #1694.
• codegen: Mixins - fix several bugs and a performance regression in #1701.

Other changes

• Publish Documentation in JAR by @lewisjkl in #1695, #1697
• Update Coursier (allows using local Alloy snapshots) by @kubukoz in #1698

Full Changelog: v0.18.33...v0.18.34