/**
 * IndexedDBKV — AsyncKV adapter using IndexedDB
 * ---------------------------------------------
 * Implements the AsyncKV interface:
 *   get(key): Promise<string|null>
 *   set(key, val, ttlSec?): Promise<void>
 *   del(key): Promise<void>
 *
 * Data is stored as { v: string, exp?: number } per record.
 * TTL auto-expires on read.
 */
/** Example usage
 * import { IndexedDBKV } from "./adapters/indexeddb-kv";
 *
 * const kv = new IndexedDBKV("ia", "kv");
 *
 * // store a value with 5s TTL
 * await kv.set("foo", "bar", 5);
 *
 * // retrieve
 * console.log(await kv.get("foo")); // "bar"
 *
 * // wait >5s, then
 * console.log(await kv.get("foo")); // null
 */
import type { AsyncKV } from '../subject/subject-store';
export declare class IndexedDBKV implements AsyncKV {
    private dbName;
    private storeName;
    private dbPromise;
    constructor(dbName?: string, storeName?: string);
    private openDB;
    private tx;
    get(key: string): Promise<string | null>;
    set(key: string, val: string, ttlSec?: number): Promise<void>;
    del(key: string): Promise<void>;
}
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