/**
 * In-memory preview cache for `edit_note` dry-run previews.
 *
 * Design notes:
 *   - TTL: 5 minutes. Previews that have not been applied within 5 minutes are
 *     silently evicted on the next `set()` or `get()` call. If a preview
 *     expires the agent must re-run `edit_note` with `dryRun: true`.
 *   - Cap: 50 entries. When the store is full, the oldest entry (by `createdAt`)
 *     is evicted to make room for the new one.
 *   - stdio MCP is one-process-per-client (per modelcontextprotocol.io/docs/learn/architecture).
 *     Process-global state is therefore equivalent to per-session state — no
 *     session-id partitioning is needed.
 */
export interface PendingEdit {
    previewId: string;
    path: string;
    originalContent: string;
    proposedContent: string;
    diff: string;
    mode: string;
    createdAt: number;
}
export declare class PreviewStore {
    private store;
    set(preview: PendingEdit): void;
    get(previewId: string): PendingEdit | undefined;
    delete(previewId: string): boolean;
    /** Exposed for tests — returns current store size (after eviction). */
    get size(): number;
    private evictExpired;
}
/** Process-global singleton. Safe because stdio MCP is single-client per process. */
export declare const previewStore: PreviewStore;