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A CLI tool to manage package dependencies

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wand lib interfaces io.ex
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lib/interfaces/io.ex

defmodule Wand.Interfaces.IO do
@moduledoc false
@callback puts(message :: String.t()) :: :ok
@callback puts(device :: IO.device(), message :: String.t()) :: :ok
def impl() do
Application.get_env(:wand, :io, IO)
end
end