2

const defaultOptions = {
  transitionOptions: animatedValue => ({
    opacity: animatedValue.interpolate({
      inputRange: [0, 1, 2],
      outputRange: [0, 1, .9],
    }),
    transform: [
      {
        perspective: 2000
      },
      {
        translateX: animatedValue.interpolate({
          inputRange: [0, 1, 2],
          outputRange: [-width / 2, 0, width / 2],
        }),
      },
      {
        rotateY: animatedValue.interpolate({
          inputRange: [0, 1, 2],
          outputRange: ['90deg', '0deg', '-90deg'],
        }),
      },
      {
        scale: animatedValue.interpolate({
          inputRange: [0, 1, 2],
          outputRange: [1.2, 1, .9],
        }),
      },
    ],
  }),
  animateInConfig: {
    easing: Easing.bezier(.42,-0.03,.27,.95),
    duration: 450,
  },
  animateOutConfig: {
    easing: Easing.bezier(.42,-0.03,.27,.95),
    duration: 450,
  },
}