Function forwardTo

packages/core/src/actions/send.ts:336–383

(
  target: SendToActionTarget<
    TContext,
    TExpressionEvent,
    TParams,
    AnyActorRef,
    TEvent
  >,
  options?: SendToActionOptions<
    TContext,
    TExpressionEvent,
    TParams,
    TEvent,
    TUsedDelay
  >
)

 * @param options Options to pass into the send action creator.
 */
export function forwardTo<
  TContext extends MachineContext,
  TExpressionEvent extends EventObject,
  TParams extends ParameterizedObject['params'] | undefined,
  TEvent extends EventObject,
  TDelay extends string = never,
  TUsedDelay extends TDelay = never
>(
  target: SendToActionTarget<
    TContext,
    TExpressionEvent,
    TParams,
    AnyActorRef,
    TEvent
  >,
  options?: SendToActionOptions<
    TContext,
    TExpressionEvent,
    TParams,
    TEvent,
    TUsedDelay
  >
) {
  if (isDevelopment && (!target || typeof target === 'function')) {
    const originalTarget = target;
    target = (...args) => {
      const resolvedTarget =
        typeof originalTarget === 'function'
          ? originalTarget(...args)
          : originalTarget;
      if (!resolvedTarget) {
        throw new Error(
          `Attempted to forward event to undefined actor. This risks an infinite loop in the sender.`
        );
      }
      return resolvedTarget;
    };
  }
  return sendTo<
    TContext,
    TExpressionEvent,
    TParams,
    AnyActorRef,
    TEvent,
    TDelay,
    TUsedDelay
  >(target, ({ event }: any) => event, options);
}

export interface ExecutableSendToAction extends ExecutableActionObject {
  type: 'xstate.sendTo';