/**
 * A cache that stores its values depending on block height (eg.: contract's state cache).
 * See {@link BsonFileBlockHeightSwCache} or {@link MemBlockHeightSwCache}
 *
 * @typeParam V - type of value stored in cache, defaults to `any`.
 */
export interface BlockHeightSwCache<V> {
    /**
     * returns cached value for the highest available in cache block that is not higher than `blockHeight`.
     */
    getLessOrEqual(key: string, blockHeight: number): Promise<BlockHeightCacheResult<V> | null>;
    /**
     * returns latest value stored for given key
     */
    getLast(key: string): Promise<BlockHeightCacheResult<V> | null>;
    /**
     * returns value for the key and exact blockHeight
     */
    get(key: string, blockHeight: number, returnDeepCopy?: boolean): Promise<BlockHeightCacheResult<V> | null>;
    /**
     * puts new value in cache under given {@link BlockHeightKey.key} and {@link BlockHeightKey.blockHeight}.
     */
    put(blockHeightKey: BlockHeightKey, value: V): Promise<void>;
    /**
     * checks whether cache has any value stored for given cache key
     */
    contains(key: string): Promise<boolean>;
    /**
     * flushes cache to underneath storage (if available)
     */
    flush(): Promise<void>;
}
export declare class BlockHeightKey {
    readonly cacheKey: string;
    readonly blockHeight: number;
    constructor(cacheKey: string, blockHeight: number);
}
export declare class BlockHeightCacheResult<V> {
    readonly cachedHeight: number;
    readonly cachedValue: V;
    constructor(cachedHeight: number, cachedValue: V);
}
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