import type { DB } from '../db/client.js';
export interface SlotDeliveryOptions {
    db: DB;
}
export interface SlotItem {
    id: number;
    slug: string;
    title: string;
    body: string;
    cta_text: string | null;
    cta_url: string | null;
    video_url: string | null;
    weight: number;
}
export declare class SlotDelivery {
    readonly db: DB;
    constructor({ db }: SlotDeliveryOptions);
    getActiveItems(): Promise<SlotItem[]>;
    pickForUser(whatsapp: string, { recentHours, rng }?: {
        recentHours?: number;
        rng?: () => number;
    }): Promise<SlotItem | null>;
    recordImpression(whatsapp: string, itemId: number, slot: string): Promise<void>;
    usersForSlot(slot: string, { limit }?: {
        limit?: number;
    }): Promise<{
        whatsapp: string;
    }[]>;
}
export declare function weightedPick<T>(items: T[], rng?: () => number): T | null;
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