import { Client as PlanetScaleClient, Config as PlanetScaleConfig } from "@planetscale/database";
import { BaseMessage, BaseListChatMessageHistory } from "../../schema/index.js";
export type PlanetScaleChatMessageHistoryInput = {
    tableName?: string;
    sessionId: string;
    config?: PlanetScaleConfig;
    client?: PlanetScaleClient;
};
export declare class PlanetScaleChatMessageHistory extends BaseListChatMessageHistory {
    lc_namespace: string[];
    get lc_secrets(): {
        "config.host": string;
        "config.username": string;
        "config.password": string;
        "config.url": string;
    };
    client: PlanetScaleClient;
    private connection;
    private tableName;
    private sessionId;
    private tableInitialized;
    constructor(fields: PlanetScaleChatMessageHistoryInput);
    private ensureTable;
    getMessages(): Promise<BaseMessage[]>;
    addMessage(message: BaseMessage): Promise<void>;
    clear(): Promise<void>;
}