/**
 * workspace/registration/worktree-link.ts
 *
 * The impure worktree→main-repo LINK probe. A linked git worktree records its
 * main repository in its own `.git` file, and `git rev-parse --git-common-dir`
 * resolves to that main repo's shared `.git` directory regardless of where the
 * worktree lives on disk. This is exactly the link registration inheritance must
 * follow, an orchestration-spawned worktree can sit outside the registered
 * project's subtree yet still belong to it, so we derive the MAIN worktree root
 * from the common dir rather than from path ancestry.
 *
 * Kept isolated (and behind an injectable runner) so the resolver and store stay
 * pure/testable and only this file shells out.
 */
import type { WorkspaceGitMetadata } from './types.js';
/** Runs one `git -C <cwd> <args>` and returns trimmed stdout, or null on any failure. */
export type GitRunner = (cwd: string, args: readonly string[]) => string | null;
/**
 * Probe the worktree→main-repo link for `path`. Returns `mainWorktreeRoot` only
 * when `path` is a LINKED worktree whose main repo lives elsewhere; returns an
 * empty object for the main worktree, a non-worktree directory, or a
 * non-repo/bare-repo path.
 */
export declare function probeWorktreeLink(path: string, runGit?: GitRunner): WorkspaceGitMetadata;
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