function scrollInterpolator(index) {
  const range = [3, 2, 1, 0, -1, -2, -3];
  const inputRange = getInputRangeFromIndexes(range, index);
  const outputRange = range;

  return { inputRange, outputRange };
}

function animatedStyles(index, animatedValue) {
  return {
    // Funciona
    opacity: animatedValue.interpolate({
      inputRange: [-3, -2, -1, 0, 1, 2, 3],
      outputRange: [0, 0, 0, 20, 0, 0, 0],
    }),
    // Não funciona
    borderRadius: animatedValue.interpolate({
      inputRange: [-3, -2, -1, 0, 1, 2, 3],
      outputRange: [0, 0, 0, 1, 0, 0, 0],
    }),
  };
}

class Test extends React.Component {
  renderItem = ({ item, index }) => (
    <View style={{
      backgroundColor: 'orange', borderRadius: 8, width: SIZE + 20, height: SIZE + 20, marginHorizontal: 10,
    }}
    />
  )

  render() {
    return (
      <View style={{
        flex: 1, justifyContent: 'flex-end',
      }}
      >
        <Carousel
          data={carouselItems}
          renderItem={this.renderItem}
          itemWidth={SIZE}
          itemHeight={SIZE}
          sliderWidth={screenWidth}
          sliderHeight={SIZE}
          scrollInterpolator={scrollInterpolator}
          slideInterpolatedStyle={animatedStyles}
          firstItem={initialIndex}
          onScroll={e => console.log('!!onScroll e', e.nativeEvent)}
          useScrollView
        />
      </View>
    );
  }
}