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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).


People are expected to follow the Scala Code of Conduct on GitHub and in any other project channels.


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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