/**
 * MemoryKV — AsyncKV adapter using an in-process Map
 * --------------------------------------------------
 * Implements the AsyncKV interface:
 *   get(key): Promise<string|null>
 *   set(key, val, ttlSec?): Promise<void>
 *   del(key): Promise<void>
 *
 * Features
 * - Optional TTL per entry (expires on read OR via a light sweep timer)
 * - Perfect for tests, SSR, or Node.js CLIs
 * - NOT persistent across reloads/processes
 */
/**
 *
 * # MemoryKV (AsyncKV adapter)
 *
 *  **When to use:** tests, SSR, Node.js, or quick prototyping. Not persistent.
 *
 * ```ts
 * import { MemoryKV, namespacedKV } from "./adapters/memory-kv";
 *
 * const kv = new MemoryKV(); // optional sweepEveryMs
 * await kv.set("foo", "bar", 5); // TTL 5s
 * console.log(await kv.get("foo")); // "bar"
 *
 * // Namespacing (e.g., per-subject)
 * const ns = namespacedKV(kv, "ia:subj:alice");
 * await ns.set("grants", JSON.stringify({ ... }));
 * ```
 *
 *  > For browsers, prefer `IndexedDBKV`. For production secrets, store encrypted blobs (SDK should encrypt before calling KV).
 */
export interface AsyncKV {
    get(key: string): Promise<string | null>;
    set(key: string, val: string, ttlSec?: number): Promise<void>;
    del(key: string): Promise<void>;
}
export declare class MemoryKV implements AsyncKV {
    private store;
    private sweepHandle;
    private sweepEveryMs;
    /**
     * @param sweepEveryMs how often to prune expired keys (default 30s). Set 0 to disable.
     */
    constructor(sweepEveryMs?: number);
    get(key: string): Promise<string | null>;
    set(key: string, val: string, ttlSec?: number): Promise<void>;
    del(key: string): Promise<void>;
    /** Manually prune expired entries */
    sweep(): void;
    /** Clear everything (useful in tests) */
    clear(): void;
    /** Dispose background sweep timer */
    dispose(): void;
}
export declare function namespacedKV(kv: AsyncKV, ns: string): AsyncKV;
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