[Home](./index.md) > [@snowplow/react-native-tracker](./react-native-tracker.md) > [SubjectConfiguration](./react-native-tracker.subjectconfiguration.md) > [screenViewport](./react-native-tracker.subjectconfiguration.screenviewport.md) ## SubjectConfiguration.screenViewport property The screen viewport size Signature: ```typescript screenViewport?: ScreenSize; ```