Credo.Check.Params.get

You're seeing just the function get, go back to Credo.Check.Params module for more information.
Link to this function

get(params, field, check_mod)

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Returns the given field's params value.

Example:

defmodule SamepleCheck do
  def param_defaults do
    [foo: "bar"]
  end
end

iex> Credo.Check.Params.get([], :foo, SamepleCheck)
"bar"
iex> Credo.Check.Params.get([foo: "baz"], :foo, SamepleCheck)
"baz"