feat: add Scala 3.8.4 cross-compilation target#1129
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pjfanning
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Jul 5, 2026
Motivation:\nPrepare the build for the next Scala 3 LTS lane while keeping published Scala artifacts on the current 2.13.x and 3.3.x release lines.\n\nModification:\nCentralize the next Scala version lookup for CI, keep published crossScalaVersions on release lanes, force the next lane only in build/test matrices, and fix Scala 3.8.4 compile, MiMa, and formatting issues.\n\nResult:\n2.13.x, 3.3.8, and 3.8.4 build/test coverage can run while MiMa and publishing remain on published Scala versions.
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Motivation
Ensure pekko-http compiles and tests pass on the next Scala 3 release line (3.8.x), preparing for future Scala 3.9.x compatibility.
Modification
scala3NextVersion = "3.8.4"to Dependencies.scalaallScalaVersions/crossScalaVersions"3.8"to CI matrix in validate-and-test.ymlResult
CI now compiles and tests against Scala 2.13, 3.3, and 3.8. Publishing continues with Scala 3.3.8.
Tests
CI will validate
References
None - proactive compatibility testing