/**
 * Error‑message sub-strings that indicate an auth / credential failure.
 * Used with provider auth handlers to decide whether a failed API call should
 * trigger an OAuth refresh.
 */
export declare const AUTH_ERROR_PATTERNS: readonly ["401", "403", "unauthorized", "forbidden", "invalid token", "expired token", "authentication"];
/**
 * Returns `true` when `error` looks like an authentication failure.
 */
export declare function isLikelyAuthError(error: unknown): boolean;