import { SmrtCollection } from '@happyvertical/smrt-core';
import { Referral } from '../models/Referral.js';
export declare class ReferralCollection extends SmrtCollection<Referral> {
    static readonly _itemClass: typeof Referral;
    /** All referrals credited to a referrer, newest first. */
    findByReferrer(referrerId: string): Promise<Referral[]>;
    /** All referrals pointing at one qualifying target, newest first. */
    findByTarget(targetKind: string, targetId: string): Promise<Referral[]>;
    /**
     * QUALIFIED referrals for one target — what
     * `ReferralCommissionService.processEarningEvent` resolves when given a
     * target instead of explicit referral ids.
     */
    findQualifiedByTarget(targetKind: string, targetId: string): Promise<Referral[]>;
    /**
     * Expire lapsed attributions: every `attributed` referral whose
     * `expiresAt` is set and `<= now` transitions to `expired` and is saved.
     * Referrals without an `expiresAt` never lapse.
     *
     * @returns The referrals expired by this sweep.
     */
    sweepExpired(now?: Date): Promise<Referral[]>;
}
export default ReferralCollection;
//# sourceMappingURL=ReferralCollection.d.ts.map