Fix duplicate params in paramlist generation

net_api_generator/generator.py

@@ -296,12 +296,13 @@ def typescript(output_dir):
 
             code_template = code_template.replace("$METHOD_NAME", api_function.name)
             for index, parameter in enumerate(api_function.parameters.values()):
-                replace_string = "'" + parameter.name + "'"
                 if parameter.old is not None:
+                    replace_string = "'" + parameter.name + "'"
                     if index < len(api_function.parameters) - 1:
                         replace_string += ", $OLD"
                     code_template = code_template.replace("$OLD", replace_string)
                 if parameter.new is not None:
+                    replace_string = "'" + parameter.name + "'"
                     if index < len(api_function.parameters) - 1:
                         replace_string += ", $NEW"
                     code_template = code_template.replace("$NEW", replace_string)