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Birds and cats together
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.gitignore Created project with a few basic instances and conversions Apr 24, 2015
.scalafmt.conf Add scalafmt config May 31, 2019
LICENSE Update cats' URL Feb 24, 2017
build.sbt Update cats-core, cats-laws to 1.6.1 Jun 8, 2019
scalastyle-config.xml Created project with a few basic instances and conversions Apr 24, 2015
version.sbt Setting version to 19.5.2-SNAPSHOT May 31, 2019


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This project provides cats type class instances (and other useful cats-related stuff) for various Twitter Open Source Scala projects.

It currently includes the following:

  • Type class instances for Future, Var, and Try (including Monad or MonadError, Semigroup, and equality)
  • Category and profunctor instances for Service
  • A Rerunnable type that wraps Future but provides semantics more like Scalaz's Task

These are reasonably well-tested (thanks to discipline).


Licensed under the Apache License, Version 2.0 (the "License"); you may not use this software except in compliance with the License.

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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