/**
 * Tiers capability strategy — the five on-demand collection-level tier
 * operations the `Collection` routes through. The active engine
 * ({@link withTiers}) dynamically imports the tier cores (keeping them out of
 * the floor bundle); {@link NO_TIERS} throws. Collection always builds its
 * per-call {@link TiersContext} and delegates here, so an un-opted-in caller
 * hits `NO_TIERS`'s throw.
 * @internal
 */
import type { GhostRecord } from '../../kernel/types.js';
import type { TiersContext, TierMoveResult } from './index.js';
export type { TierMoveResult };
export interface TiersStrategy {
    putAtTier<T>(ctx: TiersContext<T>, id: string, record: T, tier: number, opts?: {
        elevation?: {
            reason: string;
            fromTier: number;
        };
        source?: string;
        sourceTs?: string;
    }): Promise<TierMoveResult>;
    getAtTier<T>(ctx: TiersContext<T>, id: string): Promise<T | GhostRecord | null>;
    listAtTier<T>(ctx: TiersContext<T>): Promise<Array<{
        id: string;
        tier: number;
        readable: boolean;
    }>>;
    elevate<T>(ctx: TiersContext<T>, id: string, toTier: number): Promise<TierMoveResult>;
    demote<T>(ctx: TiersContext<T>, id: string, toTier: number): Promise<TierMoveResult>;
}
/**
 * No-op stub — the floor default. Every capability method throws
 * {@link TiersNotEnabledError}; opt in with `tiersStrategy: withTiers()` in
 * createNoydb. @internal
 */
export declare const NO_TIERS: TiersStrategy;