import type { StageOutput } from '../types/command.types.js';
export interface StageCheckpoint {
    completedAt: string;
    output: StageOutput;
    stageIndex: number;
    stageName: string;
}
export declare class CheckpointManager {
    private readonly dataDir;
    private readonly ttlMs;
    constructor(dataDir?: string, ttlMs?: number);
    clear(sessionId: string, commandName: string): void;
    read(sessionId: string, commandName: string): StageCheckpoint[];
    write(sessionId: string, commandName: string, checkpoint: StageCheckpoint): void;
    /**
     * Defense-in-depth: sessionId/commandName are internally-controlled today
     * (sessionId from SessionStore's own generator, commandName constrained
     * to the resolved command registry), not raw externally-influenced input
     * reaching this file-path-building function directly — but validating
     * cheaply here at the choke point costs nothing and closes the risk if a
     * future caller ever changes that.
     */
    private filePath;
    private isExpired;
    private readCreatedAt;
}
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