[react-native] Draw horizontal rule in React Native

This is in React Native (JSX) code, updated to today:

<View style = {styles.viewStyleForLine}></View>

const styles = StyleSheet.create({
viewStyleForLine: {
    borderBottomColor: "black", 
    borderBottomWidth: StyleSheet.hairlineWidth, 
    alignSelf:'stretch',
    width: "100%"
  }
})

you can use either alignSelf:'stretch' or width: "100%" both should work... and,

borderBottomWidth: StyleSheet.hairlineWidth

here StyleSheet.hairlineWidth is the thinnest, then,

borderBottomWidth: 1,

and so on to increase thickness of the line.