| items | any[] | | Data list. |
| renderItem | function | | (item, index) => element. Responsible for rendering a item. |
| viewport | object | | A instance of Viewport. |
| identityFunction | function | a => a | item => number or string. return a unique identity for item. |
| offscreenToViewportRatio | number | 1.8 | Ratio to determine how height to render above/below the visible bounds of the list. |
| assumedItemHeight | number | 400 | Estimated average height of items. |
| nearStartProximityRatio | number | 1.75 | distance between start and nearStart / viewport height. |
| nearEndProximityRatio | number | 0.25 | distance between nearEnd and end / viewport height. |
| onAtStart | function | | info => void called when scroll to list start. |
| onNearStart | function | | called when scroll to list near start. |
| onNearEnd | function | | called when scroll to list near end. |
| onAtEnd | function | | called when scroll to list end. |
