import { C as ChannelType, B as BaseNotificationPayload, a as NotificationResult, R as Result } from "./types.d-C7l7qdMG.js";
/**
 * Context passed through the middleware chain for a single send.
 */
interface SendContext {
  /** The channel being sent on. */
  channel: ChannelType;
  /** The (possibly mutated) payload. */
  payload: BaseNotificationPayload;
  /** The provider id handling the send. */
  provider: string;
}
/**
 * The terminal send function and the type middleware wrap.
 */
type SendFunction = (context: SendContext) => Promise<Result<NotificationResult>>;
/**
 * A middleware wraps a {@link SendFunction}. The first registered middleware is the
 * outermost wrapper (runs first on the way in, last on the way out).
 */
type Middleware = (context: SendContext, next: SendFunction) => Promise<Result<NotificationResult>>;
/**
 * Composes middleware around a terminal send function.
 * @param middlewares Middleware in registration order.
 * @param terminal The terminal send function.
 * @returns A single composed send function.
 */
declare const composeMiddleware: (middlewares: Middleware[], terminal: SendFunction) => SendFunction;
export { Middleware as M, SendContext as S, SendFunction as a, composeMiddleware as c };