import type { WorkspaceCheckpointRef, WorkspaceMaterializationResult } from '../types/session.js';
export interface CheckpointGitResult {
    code: number;
    stdout: string;
    stderr: string;
    /** Set when the runner discarded output after its safety limit. */
    stdoutTruncated?: boolean | undefined;
    stderrTruncated?: boolean | undefined;
}
export interface SessionCheckpointCasOptions {
    rootDir: string;
    projectRoot: string;
    runGit?: ((args: string[], cwd: string) => Promise<CheckpointGitResult>) | undefined;
}
/**
 * Content-addressed workspace checkpoint store.
 *
 * A manifest references a Git base tree plus CAS blobs for every changed or
 * untracked, non-ignored path. Applying it to a checkout at the same baseHead
 * reproduces the checkpoint without touching the parent working tree.
 */
export declare class SessionCheckpointCas {
    private readonly rootDir;
    private readonly projectRoot;
    private readonly runGit;
    constructor(opts: SessionCheckpointCasOptions);
    capture(_sessionId: string, _promptIndex: number): Promise<WorkspaceCheckpointRef | undefined>;
    materialize(checkpoint: WorkspaceCheckpointRef, targetRoot: string): Promise<WorkspaceMaterializationResult>;
    private objectPath;
    private manifestPath;
    private putBlob;
    private putManifest;
    private readBlob;
    private loadManifest;
    private safeOutputPath;
}
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