+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ const data = tail!.dequeue()
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ if (tail!.empty()) {
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ if (!tailChanged && tail!.next != null) {
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ this.tail = tail!.next
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ delete tail!.next
+ } else if (tailChanged) {
+ let node: PriorityQueueNode<T> | undefined = this.tail
+ while (node != null) {
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ if (node.next === tail && tail!.next != null) {
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ node.next = tail!.next
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ delete tail!.next
+ break
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ } else if (node.next === tail && tail!.next == null) {
+ delete node.next
+ this.head = node
+ break
+ }
+ node = node.next
+ }
+ }