import { type ChatGPTClient } from "./chatgpt-client.js";
import type { RichAsset } from "./rich-content.js";
export type ConversationAssetErrorCode = "asset_not_found" | "asset_mime_error" | "asset_too_large";
export declare class ConversationAssetError extends Error {
    readonly code: ConversationAssetErrorCode;
    constructor(code: ConversationAssetErrorCode, message: string);
}
export type ConversationAssetSource = Pick<ChatGPTClient, "getConversation" | "downloadConversationFile">;
export type DownloadedConversationAsset = RichAsset & {
    name: string | null;
    mime_type: string;
    size_bytes: number;
    body: Uint8Array;
};
export declare function readConversationAsset(source: ConversationAssetSource, conversationId: string, assetId: string, maxBytes: number): Promise<DownloadedConversationAsset>;