Dialyzer error when checking Mix task

kenny-evitt · October 24, 2024, 8:42pm

This answer on the following Stack Overflow question seems to have worked to fix similar errors for one of my own projects:

elixir - How to fix Dialyzer “Callback info about the ‘…’ behaviour is not available” error for new Mix.Tasks - Stack Overflow

The answer states that you can add the following to (the return value of) the project/0 function in your project Mix module file (i.e. mix.exs) – or add :mix to the list if the key-value pair already exists:

      dialyzer: [plt_add_apps: [:mix]]

Example project/0 function:

  def project do
    [
      app: :some_app,
      version: "0.1.0",
      elixir: "~> 1.6",
      start_permanent: Mix.env() == :prod,
      deps: deps(),
      # Added following line:
      dialyzer: [plt_add_apps: [:mix]]
    ]
  end