Credo.Check.run_on_source_file

You're seeing just the callback run_on_source_file, go back to Credo.Check module for more information.
Link to this callback

run_on_source_file(exec, source_file, params)

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Specs

run_on_source_file(
  exec :: Credo.Execution.t(),
  source_file :: Credo.SourceFile.t(),
  params :: Keyword.t()
) :: :ok

Runs the current check on a single source_file and appends the resulting issues to the current exec.