import type { DriverFactory, EmailDriver } from "../types.mjs";
/** Try each wrapped driver in order; move on to the next when the current
*  one returns a retryable error. Non-retryable errors short-circuit.
*
*  ```ts
*  createEmail({ driver: fallback([resend({...}), ses({...})]) })
*  ```
*/
export interface FallbackOptions {
	drivers: ReadonlyArray<EmailDriver>;
	/** Override the "is this error worth moving on for" check. */
	shouldAdvance?: (error: NonNullable<Awaited<ReturnType<EmailDriver["send"]>>["error"]>) => boolean;
}
declare const fallback: DriverFactory<FallbackOptions>;
export default fallback;