import { type MessageData } from "../services/conversations";
export type ConversationSummary = {
    id: string;
    name: string;
};
export type ConversationSnapshot = {
    id: string;
    name: string;
    messages: MessageData[];
    createdAt: number;
};
export declare abstract class ConversationHistoryStore {
    abstract list(): Promise<ConversationSummary[]>;
    abstract read(conversationId: string): Promise<ConversationSnapshot | null>;
    abstract upsert(snapshot: ConversationSnapshot): Promise<void>;
    abstract appendTurn(conversationId: string, turn: {
        user: MessageData;
        assistant: MessageData;
    }): Promise<void>;
    rename?(conversationId: string, name: string): Promise<void>;
    remove?(conversationId: string): Promise<void>;
    subscribe?(listener: () => void): () => void;
}