import type { Database, Key } from 'lmdb';
import type { AztecAsyncSingleton, AztecSingleton } from '../interfaces/singleton.js';
/**
 * Stores a single value in LMDB.
 */
export declare class LmdbAztecSingleton<T> implements AztecSingleton<T>, AztecAsyncSingleton<T> {
    #private;
    constructor(db: Database<unknown, Key>, name: string);
    get(): T | undefined;
    getAsync(): Promise<T | undefined>;
    set(val: T): Promise<boolean>;
    delete(): Promise<boolean>;
}
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