export interface ChangedOptions {
    /** Git ref to diff against (e.g. `origin/main`). */
    base: string;
    /** Migrations directory, relative to `cwd`. */
    migrationsDir: string;
    cwd?: string;
}
export declare function isGitRepository(cwd?: string): boolean;
/**
 * Absolute paths of `migration.sql` files added or modified relative to `base`.
 *
 * Prefers a three-dot diff (`base...HEAD`) so it reflects what the branch
 * changed since it diverged from base — the right comparison for a pull request.
 * Deleted files are excluded; only files that still exist on disk are returned.
 */
export declare function changedMigrationFiles(options: ChangedOptions): string[];
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