import type { MountRoot, StatPath } from '../../../../ops/types.ts';
import type { Dispatch, RepoLocation } from './types.ts';
/**
 * Find the repository governing a path, or throw git's own fatal.
 *
 * Walks up from `start` looking for a `.git` entry, stopping at the mount root.
 * Real git stops discovery at a filesystem boundary unless
 * GIT_DISCOVERY_ACROSS_FILESYSTEM is set, and a mount prefix is exactly that
 * boundary: crossing it would probe a different backend for a repository that
 * has nothing to do with the operand.
 *
 * Existence comes from `statPath` rather than one backend's stat because on a
 * prefix store a directory is not an object: `.git` answers on readdir while a
 * point lookup misses it entirely. That is the same fact `find` asks about its
 * own start point.
 *
 * What is found is not always the git directory. A `.git` file points at one
 * elsewhere, and the directory it points at may share its objects with another,
 * so the three paths are resolved here and carried separately rather than
 * derived again by each verb.
 *
 * @param dispatch workspace op dispatcher, for the two files that redirect a git
 *   directory
 * @param statPath dispatcher-backed stat asking both channels a backend can
 *   answer on; null means nothing is there
 * @param mountRoot the mount prefix serving a path
 * @param start absolute virtual path to start from, normally the session cwd or
 *   the argument of `-C`
 */
export declare function discover(dispatch: Dispatch, statPath: StatPath, mountRoot: MountRoot, start: string): Promise<RepoLocation>;
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