/// <reference types="node" />
/// <reference types="bn.js" />
import { BN } from 'ethereumjs-util';
import { CacheMap } from './manager';
export declare enum DBTarget {
    Heads = 0,
    HeadHeader = 1,
    HeadBlock = 2,
    HashToNumber = 3,
    NumberToHash = 4,
    TotalDifficulty = 5,
    Body = 6,
    Header = 7,
    CliqueSignerStates = 8,
    CliqueVotes = 9,
    CliqueBlockSigners = 10,
    Receipts = 100,
    TxLookup = 101,
    BloomBits = 102,
    BloomBitsSectionCount = 103,
    SnapAccount = 104,
    SnapStorage = 105,
    SnapRoot = 106,
    SnapJournal = 107,
    SnapGenerator = 108,
    SnapRecovery = 109,
    SnapDisabled = 110,
    SnapSyncProgress = 111
}
/**
 * DBOpData is a type which has the purpose of holding the actual data of the Database Operation.
 * @hidden
 */
export interface DBOpData {
    type?: string;
    key: Buffer | string;
    keyEncoding: string;
    valueEncoding?: string;
    value?: string | Buffer | object;
}
export type DatabaseKey = {
    blockNumber?: BN;
    blockHash?: Buffer;
    txHash?: Buffer;
    bit?: number;
    section?: BN;
    hash?: Buffer;
    accountHash?: Buffer;
    storageHash?: Buffer;
};
/**
 * The DBOp class aids creating database operations which is used by `level` using a more high-level interface
 */
export declare class DBOp {
    operationTarget: DBTarget;
    baseDBOp: DBOpData;
    cacheString: string | undefined;
    private constructor();
    static get(operationTarget: DBTarget, key?: DatabaseKey): DBOp;
    static set(operationTarget: DBTarget, value: string | Buffer | object, key?: DatabaseKey): DBOp;
    static del(operationTarget: DBTarget, key?: DatabaseKey): DBOp;
    updateCache(cacheMap: CacheMap): void;
}