message: Removed redundant state parameter
diff: @@ -19,7 +19,7 @@ class Motion extends React.Component {
  cancelAnimationFrame(this.moveId);
  }
  move() {
  - this.setState(({items: prevItems, update}) => {
  + this.setState(({items: prevItems}) => {
  var {data, enter, leave, update, getKey, onRest} = this.props;
  var dataByKey = data.reduce((acc, item) => ({...acc, [getKey(item)]: item}), {});
  var itemsByKey = prevItems.reduce((acc, item) => ({...acc, [item.key]: item}), {});
  