import { PortalTrieDB } from './util.js';
import type { AbstractLevel } from 'abstract-level';
import type { Debugger } from 'debug';
export declare class StateDB {
    db: PortalTrieDB;
    logger: Debugger;
    blocks: Map<number, string>;
    stateRoots: Map<string, string>;
    constructor(db: AbstractLevel<string, string, string>, logger?: Debugger);
    keys(): Promise<[string]>;
    /**
     * Store content by content key
     * @param contentKey serialized state network content key
     * @param content serialized state network content type
     * @returns true if content is stored successfully
     */
    storeContent(contentKey: Uint8Array, content: Uint8Array): Promise<boolean>;
    /**
     * Get database content by content key
     * @param contentKey serialized state network content key
     * @returns stored content (node or code) or undefined
     */
    getContent(contentKey: Uint8Array): Promise<string | undefined>;
}
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