ViewToken object is returned as one of properties in the onViewableItemsChanged callback, for example in FlatList component. It is exported by ViewabilityHelper.js.

{
  item: { key: "key-12" },
  key: "key-12",
  index: 11,
  isViewable: true
}

Unique numeric identifier assigned to the data element.

Specifies if at least some part of list element is visible in the viewport.

Item data

Key identifier assigned of the data element extracted to the top level.

Item section data when used with SectionList.