/**
 * Disk-marker blocking checkpoint mechanism.
 *
 * Writes .bober/approvals/<checkpointId>.pending.json containing a SUMMARY of
 * the artifact (NOT the full artifact — perf budget 100ms), polls the directory
 * until <id>.approved.json or <id>.rejected.json appears, deletes the pending
 * file, and returns the matching CheckpointOutcome. Times out at a configurable
 * cap (default 24h, max 7d) writing a TIMEOUT marker.
 *
 * Sprint 9 — colocated in mechanisms/ per Sprint 7+8 precedent.
 */
import type { CheckpointArtifact, CheckpointId, CheckpointMechanism, CheckpointOutcome } from "../types.js";
export interface DiskMechanismOptions {
    /** Default 2000ms; configurable via pipeline.approvalPollMs */
    pollMs?: number;
    /** Default 24h; capped at 7d via MAX_TIMEOUT_MS */
    timeoutMs?: number;
    /** Optional runId stamped into the pending file */
    runId?: string;
}
export declare class DiskCheckpointMechanism implements CheckpointMechanism {
    private readonly approvalsDir;
    private readonly options;
    private readonly now;
    /**
     * @param approvalsDir - Absolute path to .bober/approvals directory.
     * @param options      - Polling + timeout + runId options.
     * @param now          - Clock injection for deterministic timeout tests.
     *                       Defaults to Date.now.
     */
    constructor(approvalsDir: string, options?: DiskMechanismOptions, now?: () => number);
    request(checkpoint: CheckpointId, artifact: CheckpointArtifact): Promise<CheckpointOutcome>;
}
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