Credo.CLI.Output.issue_color

You're seeing just the function issue_color, go back to Credo.CLI.Output module for more information.
Link to this function

issue_color(issue_or_priority)

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Returns a suitable color for a given priority.

iex> Credo.CLI.Output.issue_color(%Credo.Issue{priority: :higher})
:red

iex> Credo.CLI.Output.issue_color(%Credo.Issue{priority: 20})
:red