scrollTo / scrollBy on mount fails (NaN)

[mschipperheyn]

Which OS ?

Android

Version

Which versions are you using:

• react-native-swiper v1.6.0
• react-native v61.x

Expected behaviour

When you call carouselRef.current.scrollTo(slides.length - 1, true);
it should transition to the last slide

Actual behaviour

It doesn't do anything bc his.internals.offset[dir] is undefined, leading
https://github.com/leecade/react-native-swiper/blob/master/src/index.js#L467 to result in NaN

Solution possibly:
const diff = offset[dir] - (this.internals.offset[dir] || 0)

How to reproduce it>

call scrollTo or scrollBy after mount before you swiped

Steps to reproduce

1. mount component
2. call carouselRef.current.scrollTo(slides.length - 1, true);