Function normalizeTarget

packages/core/src/utils.ts:222–232

(
  target: SingleOrArray<string | StateNode<TContext, TEvent>> | undefined
)

}

export function normalizeTarget<
  TContext extends MachineContext,
  TEvent extends EventObject
>(
  target: SingleOrArray<string | StateNode<TContext, TEvent>> | undefined
): ReadonlyArray<string | StateNode<TContext, TEvent>> | undefined {
  if (target === undefined || target === TARGETLESS_KEY) {
    return undefined;
  }
  return toArray(target);
}

export function toObserver<T>(
  nextHandler?: Observer<T> | ((value: T) => void),