import { type RawMessageItem, type GetUpdatesResp, type GetUploadUrlResp, type GetConfigResp, type QrCodeResponse, type QrStatusResponse } from './types.js';
export declare class ApiError extends Error {
    readonly status: number;
    readonly code?: number;
    constructor(message: string, options: {
        status: number;
        code?: number;
    });
}
export declare function isSessionExpired(error: unknown): boolean;
export declare function fetchQrCode(baseUrl: string): Promise<QrCodeResponse>;
export declare function pollQrStatus(baseUrl: string, qrcode: string): Promise<QrStatusResponse>;
export declare function getUpdates(baseUrl: string, token: string, buf: string, signal?: AbortSignal): Promise<GetUpdatesResp>;
export declare function sendMessage(baseUrl: string, token: string, toUserId: string, contextToken: string, itemList: RawMessageItem[]): Promise<void>;
export declare function getConfig(baseUrl: string, token: string, userId: string, contextToken: string): Promise<GetConfigResp>;
export declare function sendTyping(baseUrl: string, token: string, userId: string, ticket: string, status: 1 | 2): Promise<void>;
/**
 * Step 1 of upload: get CDN upload URL.
 * media_type: 1=IMAGE, 2=VIDEO, 3=FILE, 4=VOICE
 */
export declare function getUploadUrl(baseUrl: string, token: string, opts: {
    filekey: string;
    mediaType: 1 | 2 | 3 | 4;
    toUserId: string;
    rawSize: number;
    rawMd5: string;
    aesKeyHex: string;
}): Promise<GetUploadUrlResp>;
/**
 * Step 3 of upload: POST encrypted bytes to CDN.
 * Returns x-encrypted-param header value (= CDNMedia.encrypt_query_param for download).
 */
export declare function uploadToCdn(encryptedBytes: Buffer, uploadParam: string, filekey: string): Promise<string>;
/**
 * Download encrypted bytes from CDN. Caller must decrypt with AES-128-ECB.
 */
export declare function downloadFromCdn(encryptQueryParam: string): Promise<Buffer>;
/**
 * Encrypt + upload a file buffer to WeChat CDN.
 * Returns { encryptQueryParam, aesKeyHex } for building CDNMedia in sendmessage.
 */
export declare function uploadMedia(baseUrl: string, token: string, toUserId: string, fileBuffer: Buffer, mediaType: 1 | 2 | 3 | 4, fileName: string): Promise<{
    encryptQueryParam: string;
    aesKeyHex: string;
    encryptedSize: number;
}>;
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