import type { OAuth2Client } from 'google-auth-library';
export declare const YOUTUBE_CHANNEL_ID: RegExp;
/** A channel ID is a guard, not a videos.insert routing parameter. Google selects
 * the personal/Brand channel during OAuth; ambiguous or mismatched grants fail closed. */
export declare function verifyYouTubeChannel(auth: OAuth2Client, expectedChannelId?: string): Promise<{
    id: string;
    title: string;
}>;