import type { GitRepository, GitRunner } from "./types.js";
/** Moves snapshots that earlier versions kept inside the user's repository
 *  (refs under `refs/omp-undo-redo/`, history files and owner leases under
 *  `<commonDir>/omp-undo-redo/`) into `repository.storeDir`, then deletes the
 *  user-side refs so `push --mirror`, `clone --mirror`, `bundle --all` and
 *  `log --all` stop exposing them. Objects that only those refs reached are
 *  packed into the store first; objects the user's own refs reach stay
 *  borrowed, like every new snapshot's. Nothing leaves the user's repository
 *  before the store holds it, and files move only once no legacy ref is left,
 *  so an interrupted run is finished by the next and a failed one changes
 *  nothing. Re-run on every backend start: an older version still running
 *  against the same repository keeps writing the legacy layout. */
export declare function migrateLegacySnapshots(git: GitRunner, repository: GitRepository): Promise<void>;