Interface TrackBySelection

src/cdk-experimental/selection/selection-set.ts:16–21

* Maintains a set of selected values. One or more values can be added to or removed from the * selection.

 * selection.
 */
interface TrackBySelection<T> {
  isSelected(value: SelectableWithIndex<T>): boolean;
  select(...values: SelectableWithIndex<T>[]): void;
  deselect(...values: SelectableWithIndex<T>[]): void;
  changed: Subject<SelectionChange<T>>;
}

/**
 * A selectable value with an optional index. The index is required when the selection is used with