Function last

packages/router/src/utils/collection.ts:69–71

(a: readonly T[])

 * Return the last element of an array.
 */
export function last<T>(a: readonly T[]): T | null {
  return a.length > 0 ? a[a.length - 1] : null;
}

export function wrapIntoObservable<T>(value: T | Promise<T> | Observable<T>): Observable<T> {
  if (isObservable(value)) {