Null coalescing operator for TypoScript constants If you want to use new constant names but still need to support the old names there is a new operator ?? . It uses the first constant in the list that has a value. plugin.tx_myext.settings.size = {$config.size ?? $myext.setting.size} First config.size is checked and if that’s not set the new myext.setting.size will be used. It supports multiple variables: something = {$new.constant ?? $old.const ?? $really.old.const}