React Native styling with conditional

Use StyleSheet.create to do style composition like this,

make styles for text, valid text, and invalid text.

const styles = StyleSheet.create({
    text: {
        height: 40, backgroundColor: 'white', borderRadius: 5, padding: 10, 
    },
    textvalid: {
        borderWidth: 2,
    },
    textinvalid: {
        borderColor: 'red',
    },
});

and then group them together with an array of styles.

<TextInput
    style={[styles.text, touched && invalid ? styles.textinvalid : styles.textvalid]}
</TextInput>

For array styles, the latter ones will merge into the former one, with overwrite rule for the same keys.