(CONT-801) Deprecate parsepson.rb

Author: LukasAud

lib/puppet/functions/parsepson.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 # @summary
+#   **Deprecated:** Starting Puppet 8, we no longer natively support PSON usage. This function should be removed once we stop supporting Puppet 7.
+#
 #   This function accepts PSON, a Puppet variant of JSON, as a string and converts
 #   it into the correct Puppet structure
 #
@@ -20,7 +22,9 @@
   end
 
   def parsepson(pson_string, default = :no_default_provided)
-    PSON.load(pson_string)
+    call_function('deprecation', 'parsepson', 'This method is deprecated. From Puppet 8, PSON is no longer natively supported. Please use JSON.parse().')
+
+    PSON.load(pson_string) if Puppet::Util::Package.versioncmp(Puppet.version, '8').negative?
   rescue StandardError => e
     Puppet.debug("Parsing PSON failed with error: #{e.message}")
     raise e if default == :no_default_provided

spec/functions/parsepson_spec.rb

@@ -65,4 +65,9 @@
       end
     end
   end
+  if Puppet::Util::Package.versioncmp(Puppet.version, '8.0.0').positive?
+    it 'doesnt work on Puppet 8' do
+      expect(subject).to run.with_params('{"a":"1","b":"2"}').and_return(nil)
+    end
+  end
 end