message: refactor: remove unnecessary `undefined` type from optional argument
diff: @@ -545,7 +545,7 @@ class CombineLatestSubscriber<T> extends Subscriber<T> {
  export function combineLatestInit(
  observables: ObservableInput<any>[],
  - scheduler?: SchedulerLike | undefined,
  + scheduler?: SchedulerLike,
  valueTransform: (values: any[]) => any = identity
  ) {
  return (subscriber: Subscriber<any>) => {
  