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This project adds a mix dialyzer task to your project. In addition to simply automating dialyzer for Elixir projects, it provides some features that existing solutions may not:

  • Layered construction and validation of global PLTs for Erlang/OTP, Elixir, and a local PLT for project dependencies.
  • Friendly ANSI-colored output.
  • Exits non-zero when dialyzer produces warnings (good for continuous integration usage).
  • Defaults to the strictest set of warnings available in Dialyzer, except for the few that are overly expensive.
  • Ability to ignore acceptable warnings based on match patterns. For example, to ignore warnings produced by protocol compilation:
    # Ignore dialyzer warnings about compiler generated specs for Protocols
    {:warn_contract_supertype, :_, {:extra_range, [:_, :__protocol__, 1, :_, :_]}}

For more details, consult mix help dialyzer after installation.


dialyzex is available for installation from Hex. The package can be installed by adding dialyzex to your list of dependencies in mix.exs:

  def deps do
      {:dialyzex, "~> 1.2.0", only: :dev}


Documentation is generated with ExDoc and published on HexDocs at


If you would like to contribute code to this project you can do so through GitHub by forking the repository and sending a pull request. Before Comcast merges your code into the project you must sign the Comcast Contributor License Agreement (CLA). If you haven't previously signed a Comcast CLA, you'll automatically be asked to when you open a pull request. Alternatively, we can e-mail you a PDF that you can sign and scan back to us. Please send us an e-mail or create a new GitHub issue to request a PDF version of the CLA.

Copyright & License

Copyright 2017 Comcast Cable Communications Management, LLC

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

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.

This product includes software developed at Comcast (


A Mix task for type-checking your Elixir project with dialyzer





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