import type { AgentContentPart } from "./download-files.js";
export interface StoredMessage {
    role: "user" | "assistant";
    /** Plain text for normal turns; multimodal parts when the user sent media. */
    content: string | AgentContentPart[];
    /** Sortable timestamp (the inbound message ts, or a monotonic counter). */
    ts: string;
    /**
     * Platform message id (WhatsApp `wamid`) when known. Lets a later quote-reply
     * resolve the message it quotes (the webhook sends only the quoted id, not its
     * text). Optional — durable stores may omit it.
     */
    id?: string;
}
/**
 * Pluggable conversation-history persistence. WhatsApp exposes no readable
 * history, so the adapter holds it here and replays it into `agent.messages`
 * each turn. The default is in-memory; swap in a durable backend (Redis,
 * Postgres, …) by implementing this interface.
 */
export interface HistoryStore {
    append(conversationKey: string, message: StoredMessage): Promise<void>;
    read(conversationKey: string): Promise<StoredMessage[]>;
}
export interface InMemoryHistoryStoreOptions {
    /** Keep at most this many messages per conversation (drops oldest). Default 100. */
    maxMessages?: number;
}
export declare class InMemoryHistoryStore implements HistoryStore {
    private readonly map;
    private readonly maxMessages;
    constructor(opts?: InMemoryHistoryStoreOptions);
    append(conversationKey: string, message: StoredMessage): Promise<void>;
    read(conversationKey: string): Promise<StoredMessage[]>;
}
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