/**
 * Enable the hierarchical-tiers capability.
 * Pass to `createNoydb({ tiersStrategy: withTiers() })` to make a collection's
 * `putAtTier` / `getAtTier` / `listAtTier` / `elevate` / `demote` methods live.
 * The tier read/write/re-key engine is dynamically imported here, so it stays
 * out of the floor bundle until opted in.
 */
import type { TiersStrategy } from './strategy.js';
export declare function withTiers(): TiersStrategy;