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dialyxir lib dialyxir output.ex
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lib/dialyxir/output.ex

defmodule Dialyxir.Output do
alias IO.ANSI
def color(text, color) when is_binary(text) do
ANSI.format([color, text])
end
def info(""), do: :ok
def info(text), do: Mix.shell().info(text)
def warning(""), do: :ok
def warning(text), do: Mix.shell().info(color(text, :yellow))
def error(""), do: :ok
def error(text), do: Mix.shell().error(text)
end