import type { StringMap } from '@naturalcycles/js-lib/types';
import { Pipeline } from '@naturalcycles/nodejs-lib/stream';
import type { CommonDBCreateOptions } from '../db.model.js';
import type { CommonKeyValueDB, IncrementTuple, KeyValueDBTuple } from '../kv/commonKeyValueDB.js';
export interface InMemoryKeyValueDBCfg {
}
export declare class InMemoryKeyValueDB implements CommonKeyValueDB {
    cfg: InMemoryKeyValueDBCfg;
    constructor(cfg?: InMemoryKeyValueDBCfg);
    support: {
        count?: boolean;
        increment?: boolean;
    };
    data: StringMap<StringMap<any>>;
    ping(): Promise<void>;
    createTable(_table: string, _opt?: CommonDBCreateOptions): Promise<void>;
    deleteByIds(table: string, ids: string[]): Promise<void>;
    getByIds(table: string, ids: string[]): Promise<KeyValueDBTuple[]>;
    saveBatch(table: string, entries: KeyValueDBTuple[]): Promise<void>;
    streamIds(table: string, limit?: number): Pipeline<string>;
    streamValues(table: string, limit?: number): Pipeline<Buffer>;
    streamEntries(table: string, limit?: number): Pipeline<KeyValueDBTuple>;
    count(table: string): Promise<number>;
    incrementBatch(table: string, entries: IncrementTuple[]): Promise<IncrementTuple[]>;
}