Custom snapshot resolvers

[kettanaito]

What

Need to consider custom snapshot resolvers.

Why

This would allow the most flexibility in the tracking logic.

How

new Observer({
  snapshots: [
    thresholdX: 25, // this is available under "snapshot.thresholdX"
    resolver: ({ targetRect, boundsRect, snapshot }) => {
       // custom logic which should return Boolean
    },
    callback() {}
  ]
});