/**
 * Filesystem TTL store — copied from mcp-ui `src/utils/dataLinkStore.ts`.
 *
 * Same role as mcp-ui's `.data/`: one JSON file per link id, each wrapping the
 * payload in a `{ value, exp }` envelope so an expired file is dropped on the
 * next touch rather than lingering. Reads and writes are sync on purpose — the
 * store is small and the signing path must not interleave.
 *
 * Deviation from mcp-ui: the stored record carries an opaque `payload` instead
 * of mcp-ui's `{ config, data }` split, because this package's contract
 * (`SignDataLink = (payload: unknown) => SignedLink`) signs arbitrary payloads.
 * The envelope, file layout, and expiry mechanics are unchanged.
 */
export type StoredDataLink = {
    id: string;
    createdAt: string;
    ttlSeconds: number;
    payload: unknown;
};
/**
 * Resolve the on-disk TTL store directory.
 * Cursor/Claude stdio often have cwd=$HOME, so `path.resolve(cwd, '.data')`
 * would write to ~/.data while the server reads the package `.data` — the
 * links then 404. Default: `<packageRoot>/.data` unless STORAGE_DIR is absolute.
 */
export declare function resolveDataLinkStorageDir(env?: NodeJS.ProcessEnv, root?: string): string;
export declare const DEFAULT_TTL_MS: number;
export declare class TtlStore {
    private readonly defaultTtlMs;
    private readonly dataDir;
    constructor(defaultTtlMs?: number, dataDir?: string);
    private ensureDir;
    private filePathFor;
    set(id: string, payload: unknown, customTtlMs?: number): void;
    get(id: string): StoredDataLink | null;
    has(id: string): boolean;
    delete(id: string): boolean;
    size(): number;
    /** Drop every link. Used by tests and by store teardown. */
    destroy(): void;
    private linkFiles;
    private unlinkQuietly;
    /** Sweep expired (and unreadable) files so the directory cannot grow forever. */
    private cleanup;
}
export declare function getDataLinkStore(): TtlStore;
/** Test-only: drop the singleton so STORAGE_DIR can be re-read. */
export declare function resetDataLinkStoreForTests(): void;