import { E as EmailOptions, F as FeatureFlags, R as Result, M as MaybePromise, a as EmailResult } from "./types.d-CyiC9uRC.js";
/**
 * Standard provider interface for email services.
 */
interface Provider<OptionsT = unknown, InstanceT = unknown, EmailOptionsT extends EmailOptions = EmailOptions> {
  endpoint?: string;
  features?: FeatureFlags;
  getEmail?: (id: string) => MaybePromise<Result>;
  getInstance?: () => InstanceT;
  initialize: (options?: Record<string, unknown>) => MaybePromise<void>;
  isAvailable: () => MaybePromise<boolean>;
  name?: string;
  options?: OptionsT;
  sendEmail: (options: EmailOptionsT) => MaybePromise<Result<EmailResult>>;
  shutdown?: () => MaybePromise<void>;
  validateCredentials?: () => MaybePromise<boolean>;
}
/**
 * Type for provider factory function.
 */
type ProviderFactory<OptionsT = unknown, InstanceT = unknown, EmailOptionsT extends EmailOptions = EmailOptions> = (options?: OptionsT) => Provider<OptionsT, InstanceT, EmailOptionsT>;
/**
 * Helper function to define an email provider.
 * @param factory The provider factory function.
 * @returns The same factory function (for type inference).
 */
declare const defineProvider: <OptionsT = unknown, InstanceT = unknown, EmailOptionsT extends EmailOptions = EmailOptions>(factory: ProviderFactory<OptionsT, InstanceT, EmailOptionsT>) => ProviderFactory<OptionsT, InstanceT, EmailOptionsT>;
export { ProviderFactory as P, Provider as a, defineProvider as d };