import { type Repo } from './repo.ts';
/**
 * Render a patch between two trees, in git's own format.
 *
 * Paths are compared in sorted order, which is what git prints; a path whose
 * blob id is unchanged is skipped even when its mode moved, apart from the mode
 * lines, because there is no content hunk to show.
 *
 * @param repo repository holding the objects
 * @param beforeTree the tree on the minus side, or null for no commit at all
 * @param afterTree the tree on the plus side
 */
export declare function treeDiff(repo: Repo, beforeTree: string | null, afterTree: string | null): Promise<string>;
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