/**
 * session-changes.ts
 *
 * Pure computation for `WorkspaceCheckpointManager.sessionChanges`, the
 * aggregate file changes a single session made, joined over its
 * sessionId-stamped checkpoints. Split out of manager.ts (at the 800-line cap)
 * as a self-contained helper; the manager calls it while holding its index
 * lock, so the caller, not this function, is responsible for serialization.
 */
import type { SideGitRunner } from './side-git.js';
import type { WorkspaceCheckpoint, CheckpointSessionChanges } from './types.js';
/**
 * Compute a session's aggregate change: the net diff from the state BEFORE the
 * session's earliest checkpoint (that checkpoint's parent, or the empty tree
 * when the session opened the store) to the session's LATEST checkpoint. A
 * session with no stamped checkpoints yields `checkpointCount: 0` with an empty
 * diff (from/to === 'EMPTY'), an honest "nothing recorded", never an error.
 */
export declare function computeSessionChanges(checkpoints: ReadonlyMap<string, WorkspaceCheckpoint>, sideGit: SideGitRunner, sessionId: string): Promise<CheckpointSessionChanges>;
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