/**
 * The host's mounted slots, as ROWS — the registry a surface reports itself
 * into, so anything that offers to build for a slot can name the real ones.
 *
 * A slot exists because a page RENDERS it, and nothing announces when one is
 * taken off a page: a row written once would outlive its surface forever. So
 * every render reports the slot again, refreshing `lastSeen`, and the read
 * filters on it — a slot that stopped rendering ages out of the registry on its
 * own after {@link SLOT_DECAY_MS}.
 *
 * The rows live in the GENERIC records collection, like the placement rows
 * beside them (`placements.ts`): `vendo_slots` is neither reserved nor
 * dedicated (`packages/vendo/src/store/routing.ts`), so it routes to `vendo_records`
 * on every adapter with no migration to run.
 *
 * `refs` carries `subject` and nothing else — the key the erase cascade matches
 * (`vendo_records WHERE refs @> '{"subject": …}'::jsonb`, `packages/vendo/src/store/
 * erase.ts`), and the only query this surface ever makes.
 */
import { SLOT_DECAY_MS, type RunContext, type SlotEntry } from "@vendoai/core";
import type { EngineOps } from "./engine.js";
/** The generic collection the slot rows live in (never a dedicated table). */
export declare const SLOTS_COLLECTION = "vendo_slots";
export { SLOT_DECAY_MS };
/** One slot, as the host's surface reports it. */
export interface SlotDescriptor {
    id: string;
    label: string;
    /** What the spot is FOR, in the host developer's own words — the sentence an
     *  agent reads to pick between two slots a label alone cannot separate. */
    description?: string;
}
export type { SlotEntry };
export interface SlotRegistry {
    /** Idempotent: one row per (subject, slot), refreshed in place. */
    report(input: {
        slots: readonly SlotDescriptor[];
    }, ctx: RunContext): Promise<void>;
    /** The caller's own slots inside the decay window, most recently seen first. */
    list(ctx: RunContext): Promise<SlotEntry[]>;
}
export declare const createSlotRegistry: (engine: EngineOps) => SlotRegistry;
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