import { GitHubBot } from '../bot/base';
/**
 * 解析频道 ID
 * @param channelId 格式：owner/repo:type:number
 * @returns 解析结果或 null
 */
export declare function parseChannelId(channelId: string): {
    owner: string;
    repo: string;
    type: string;
    number: number;
} | null;
/**
 * 使用 assets 服务转存非 HTTPS 协议的资源
 */
export declare function transformUrl(bot: GitHubBot, elementString: string): Promise<string | null>;