FILE: C:\ProgramData\PuppetLabs\puppet\var\lib\puppet\functions\deprecation.rb

--
#   Function to print deprecation warnings, Logs a warning once for a given key.
#
# The uniqueness key - can appear once.
# The msg is the message text including any positional information that is formatted by the
# user/caller of the method.
# It is affected by the puppet setting 'strict', which can be set to :error
# (outputs as an error message), :off (no message / error is displayed) and :warning
# (default, outputs a warning)  *Type*: String, String.
#
Puppet::Functions.create_function(:deprecation) do
  # @param key
  # @param  message
  # @return deprecated warnings
  dispatch :deprecation do
    param 'String', :key
    param 'String', :message
  end

  def deprecation(key, message)
    if defined? Puppet::Pops::PuppetStack.stacktrace
      stacktrace = Puppet::Pops::PuppetStack.stacktrace()
      file = stacktrace[0]
      line = stacktrace[1]
      message = "#{message} at #{file}:#{line}"
    end
    # depending on configuration setting of strict
    case Puppet.settings[:strict]
    when :off # rubocop:disable Lint/EmptyWhen : Is required to prevent false errors
      # do nothing
    when :error
      raise("deprecation. #{key}. #{message}")
    else
      unless ENV['STDLIB_LOG_DEPRECATIONS'] == 'false'
        Puppet.deprecation_warning(message, key)
      end
    end
  end
end

--