/**
 * Lightweight, zero-dependency protobuf decoder for Bilibili SEND_GIFT_V2.
 *
 * Handles only the subset of wire types and fields required by SendGiftV2.
 * Designed for performance: no reflection, no codegen, no allocations beyond
 * the target object.
 *
 * @see {@link https://github.com/lovelyyoshino/Bilibili-Live-API/blob/master/API.live_websocket.md}
 */
export interface SendGiftV2Medal {
    anchor_uid: number;
    medal_level: number;
    medal_name: string;
    color_start: number;
    color: number;
    color_border: number;
    color_end: number;
    guard_level: number;
}
export interface SendGiftV2Effect {
    img_basic: string;
    img_2: string;
    img_gif: string;
}
export interface SendGiftV2Receiver {
    uname: string;
    uid: number;
}
export interface SendGiftV2Gift {
    gift_id: number;
    gift_name: string;
    num: number;
    price: number;
    total_coin: number;
    coin_type: string;
    tid: string;
    timestamp: number;
    action: string;
    receiver: SendGiftV2Receiver;
    effect?: SendGiftV2Effect;
}
export interface SendGiftV2Data {
    uid: number;
    uname: string;
    face: string;
    medal?: SendGiftV2Medal;
    gift: SendGiftV2Gift;
}
/**
 * Decode a base64-encoded SEND_GIFT_V2 protobuf payload.
 *
 * @param base64 - The raw `data.pb` string from a SEND_GIFT_V2 message.
 * @returns Decoded gift data.
 * @throws If the input is not valid base64 or protobuf.
 */
export declare function decodeSendGiftV2(base64: string): SendGiftV2Data;