/**
 * pruner.ts
 *
 * `WorkspaceCheckpointPruner`, the `Pruner` implementation `RetentionPolicy`
 * drives to enforce retention limits on workspace checkpoints. Split out of
 * manager.ts (which was at the 800-line cap) as a self-contained collaborator;
 * see manager.ts's `gc()` for how it is wired and why reclamation only works on
 * parentless checkpoint commits.
 */
import { type CheckpointRecord, type Pruner, type PruneResult, type PruneOptions } from '../../runtime/retention/index.js';
import { SideGitRunner } from './side-git.js';
/**
 * `Pruner` implementation for `RetentionPolicy` that deletes checkpoint REFS
 * (not filesystem paths, that is what `SnapshotPruner`, the compaction-side
 * pruner, does, and reusing it here would be a no-op at best since our
 * "artifacts" are refs+objects, not files). Actual object reclamation is a
 * single `git gc --prune=now` run once by `WorkspaceCheckpointManager.gc()`
 * after refs are deleted, not per-record here.
 */
export declare class WorkspaceCheckpointPruner implements Pruner {
    private readonly sideGit;
    private readonly onDeleted;
    constructor(sideGit: SideGitRunner, onDeleted: (id: string) => void);
    delete(candidates: readonly CheckpointRecord[], options?: PruneOptions): Promise<PruneResult>;
}
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