/**
 * Pick a safe default diff base for bare `kern review` inside a git repo.
 * Tries `origin/main`, then `origin/master`, then `HEAD~1`, returning the
 * first ref that `git rev-parse --verify` accepts. Returns undefined when
 * not in a git repo or no suitable ref exists (e.g. single-commit repo).
 *
 * Exported for testability.
 */
export declare function detectAutoDiffBase(cwd?: string): string | undefined;
export declare function runReview(args: string[]): Promise<void>;