/**
 * Durable, path/machine-independent workspace id derived from git history.
 *
 * DESIGN:
 *  - The pure function `computeDurableWorkspaceId` is I/O-free and unit-testable
 *    with no filesystem dependency.
 *  - The I/O function `durableWorkspaceId` runs git commands (execFileSync) and
 *    returns undefined on any error (git absent / not a repo / command failure).
 *  - The core package (@sentropic/h2a) stays pure — no git/fs is added there.
 *
 * DERIVATION (pinned with track):
 *   workspaceId = "ws:" + sha256hex( rootCommitSHA + "\n" + worktreeRelPath )
 *
 *   rootCommitSHA : all root commits from `git rev-list --max-parents=0 HEAD`,
 *                   sorted ascending, joined with ",". Invariant across
 *                   clones / paths / machines.
 *
 *   worktreeRelPath: "" for the main worktree; the worktree NAME (basename of
 *                   the .git/worktrees/<name> dir) for a linked worktree.
 *                   Contains no absolute path.
 */
/**
 * Compute the durable workspace id from pre-fetched git values.
 *
 * @param rootCommitSHA All root commit SHAs, sorted ascending, joined with ","
 *                      (single root is the single SHA).
 * @param worktreeRelPath "" for the main worktree; the worktree name for a
 *                        linked worktree.
 * @returns "ws:" + sha256hex(rootCommitSHA + "\n" + worktreeRelPath)
 */
export declare function computeDurableWorkspaceId(rootCommitSHA: string, worktreeRelPath: string): string;
/**
 * Run git commands to derive the durable workspace id for `cwd`.
 *
 * Returns `undefined` if:
 * - git is unavailable (git not installed, PATH issue, Windows no-git)
 * - `cwd` is not inside a git repository
 * - any git command fails for any reason
 *
 * On success returns `computeDurableWorkspaceId(rootCommitSHA, worktreeRelPath)`.
 */
export declare function durableWorkspaceId(cwd: string): string | undefined;
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