/**
 * Reads the auth token, refreshing it via OAuth if expired.
 *
 * Uses `@vercel/cli-auth` to:
 * 1. Read credentials from disk (`auth.json`)
 * 2. Check if the access token is expired
 * 3. If expired, use the refresh token to obtain a new access token
 * 4. Persist the updated credentials back to disk
 *
 * Returns the valid access token, or `null` if credentials are
 * missing or the refresh fails.
 */
export declare function getAuthToken(): Promise<string | null>;
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