import type { AgentMessageMetadata, AgentSkillReference } from "./types.js";
type MetadataMessage = {
    role: string;
    threadId: string;
    turnId: string;
    clientMessageId?: string;
};
export declare class MessageMetadataStore {
    private directory;
    private queue;
    private ready?;
    constructor(directory?: string);
    recordPending(clientMessageId: string, value: unknown): Promise<{
        skill?: AgentSkillReference | undefined;
        canvasReferences?: {
            previewUrl?: string;
            nodeId: string;
            label: string;
            title: string;
            kind: "image" | "video" | "audio" | "text";
            text?: string;
        }[] | undefined;
        attachments?: {
            url: string;
            id: string;
            name: string;
            type?: string;
            size?: number;
            width?: number;
            height?: number;
        }[] | undefined;
    } | undefined>;
    bindThread(clientMessageId: string, threadId: string): Promise<void>;
    bindTurn(clientMessageId: string, threadId: string, turnId: string): Promise<void>;
    mergeThread<T extends MetadataMessage>(threadId: string, messages: T[]): Promise<(T & AgentMessageMetadata)[]>;
    remove(clientMessageId: string, threadId?: string): Promise<void>;
    removeThread(threadId: string): Promise<void>;
    readAsset(messageKey: string, assetFile: string): Promise<{
        data: NonSharedBuffer;
        contentType: string;
    } | undefined>;
    private run;
    private ensureReady;
    private initialize;
    private pendingFile;
    private threadDirectory;
    private threadFile;
    private assetDirectory;
}
export declare const messageMetadataStore: MessageMetadataStore;
export {};