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cats v2.2.0-M1 Release Notes

  • 2020 March 31

    3 source breaking changes

    • 🚚 #3043 Move standard library type class instances into implicit scope by @travisbrown
    • #3241 Reimplemented MonadError[FreeT[...]] to be correct by @djspiewak
    • #3361 Restrict attemptNarrow to subtypes of Throwable by @travisbrown

    🛠 2 bug fixes

    • #3306 Make cats.syntax.flatMap include untilDefinedM by @travisbrown
    • #3305 Add cats.syntax.hash by @travisbrown

    31 API/feature enhancements

    • #3321 Reinstate @johnynek's intercalate optimization from #3279 by @travisbrown
    • #3374 Add EitherT.liftAttemptK by @kubukoz
    • #3168 Use getOrElse in NonEmptyList#last by @PeterPerhac
    • #2689 Add orElseRaise syntax for ApplicativeError by @kubukoz
    • #3372 Add zipAll to Align typeclass by @dantb
    • #3328 Fix short circuiting behaviour in traverse and traverseFilter by @gagandeepkalra
    • #3362 Prepend a Vector to a NonEmptyVector by @ssanj
    • #3361 Restrict attemptNarrow to subtypes of Throwable by @travisbrown
    • #3346 Add Either.unit, use in Applicative[Either[A, ?]] by @rossabaker
    • #3323 Re-encode relationships to avoid implicit conversion functions by @travisbrown
    • #3316 Add semiflatTap and leftSemiflatTap functions to EitherT by @matwojcik
    • #3324 Use ArraySeq.untagged instead of ClassTag[Nothing] by @travisbrown
    • #3235 Added flatMapK to FreeT by @djspiewak
    • #3279 Add Semigroup and Monoid combinators reverse and intercalate by @johnynek
    • #3303 Use unlimited MathContext for BigDecimal arithmetic by @travisbrown
    • #3307 Clean up some NonEmpty stuff by @travisbrown
    • ⚡️ #3283 Optimize traverse by @travisbrown
    • 👀 #3294 Add traverseEither by @LukaJCB
    • #3302 ArraySeq instance follow-up by @travisbrown
    • #3278 Issue 2304: Missing functions for RWST by @barambani
    • #3273 Adding instances for ArraySeq by @BalmungSan
    • #3274 Add ContT.liftF and ContT.liftK by @lavrov
    • #3263 Avoid syntax methods in implementations in cats-core by @travisbrown
    • ✅ #3261 Fix compiler warnings in tests by @travisbrown
    • ✅ #3255 More Dotty compat stuff in tests by @travisbrown
    • #3254 Use dotty-friendly kind-projector placeholder by @travisbrown
    • ✅ #3253 Some Dotty compat for tests by @travisbrown
    • #3239 add List#scanLeftNel and List#scanRightNel by @enzief
    • #3237 Follow up to #3233 by @strong-zero
    • #3233 Add when and unless to OptionT by @strong-zero
    • #3230 Add two casts to satisfy Dotty by @travisbrown
    • 🆓 #3225 Publicize Free#foldStep by @djspiewak

    📚 11 documentation improvements

    • 📦 #3301 Cats package: add comprehensive scaladoc. by @diesalbla
    • #3364 Fix typo by @MaT1g3R
    • #3314 Fix doc examples for Ior.map by @ybasket
    • ⚡️ #3290 Update readme with latest cats-core version by @leusgalvan
    • 🚚 #3285 Remove machinist from colophon microsite page by @markusa380
    • 📄 #3272 Fix typo on Chain docs by @LLCampos
    • #3265 Copyright and license by @travisbrown
    • 🚚 #3229 fixes #3206 remove references to waffle.io by @ssikdar1
    • ⚡️ #3226 Update kind-projector and simulacrum url by @xuwei-k
    • #3224 Add a Developer-Comment regarding an unused parameter. by @diesalbla
    • ✏️ #3221 Fix typos by @bwignall

    🏗 38 build improvements

    • #3193 Expand kind-projector's syntax for polymorphic function values by @travisbrown
    • ⚡️ #3365 Update sbt-microsites to 1.1.5 by @scala-steward
    • ⚡️ #3371 Update sbt-sonatype to 3.9.2 by @scala-steward
    • ✅ #3325 Specific commutativity and associativity tests for BigDecimal by @travisbrown
    • ✅ #3342 Fix Foldable doctest to use separateFoldable instead of separate by @gagandeepkalra
    • ⚡️ #3352 Update sbt-microsites to 1.1.3 by @scala-steward
    • #3354 Change review policy for PRs that don't target master by @travisbrown
    • ⚡️ #3319 Update changelog by @travisbrown
    • ⚡️ #3337 Update Scalafmt to 2.4.2 by @travisbrown
    • ⚡️ #3331 Update sbt-mima-plugin to 0.7.0 by @scala-steward
    • ⚡️ #3326 Update snakeyaml to 1.26 by @scala-steward
    • ⚡️ #3344 Update sbt-scalafmt to 2.3.2 by @scala-steward
    • ✅ #3350 Add Align lawful tests for Option instance by @gagandeepkalra
    • ✅ #3304 Replace instance trait inheritance with imports in tests by @travisbrown
    • #3322 Add parentheses for Dotty by @travisbrown
    • ⚡️ #3311 Update sbt-microsites to 1.1.2 by @scala-steward
    • ⚡️ #3310 Update discipline-scalatest by @travisbrown
    • ⚡️ #3308 Update scalacheck-1-14 to 3.1.1.0 by @scala-steward
    • ⚡️ #3291 Update sbt-scalajs-crossproject to 1.0.0 by @scala-steward
    • ⚡️ #3284 Update sbt to 1.3.8 by @scala-steward
    • ⚡️ #3288 Update sbt-mima-plugin to 0.6.4 by @scala-steward
    • ⚡️ #3282 Update sbt-mima-plugin to 0.6.3 by @scala-steward
    • ⚡️ #3276 Update sbt-unidoc to 0.4.3 by @scala-steward
    • ⚡️ #3267 Update sbt-scalajs to 0.6.32 by @scala-steward
    • ⚡️ #3268 Update sbt-doctest with ScalaTest 3.1.0 and Dotty fixes by @travisbrown
    • ⚡️ #3266 Update discipline-scalatest to 1.0.0 by @scala-steward
    • ⚡️ #3277 Update sbt-scalafmt to 2.3.1 by @scala-steward
    • #3246 Minor changes for Scala.js 1.0 compatibility by @travisbrown
    • ⚡️ #3259 Update discipline-scalatest by @travisbrown
    • 🚀 #3258 Update sbt-release to 1.0.13 by @scala-steward
    • ⚡️ #3257 Update sbt to 1.3.7 by @scala-steward
    • ⚡️ #3251 Update sbt-microsites to 1.1.0 by @scala-steward
    • ✅ #3250 Avoid ScalaTest 3.1.0 deprecations by @travisbrown
    • ⚡️ #3244 Update discipline-scalatest and scalatestplus dependency by @travisbrown
    • 🚚 #3243 Remove unused Scala Native sbt plugin by @travisbrown
    • ⚡️ #3232 Update Scalafmt to 2.3.2 by @travisbrown
    • #3231 Drop cats-macros project by @travisbrown
    • ⚡️ #3227 Update sbt to 1.3.6 by @scala-steward