import type { UpstreamKV } from "./upstream-kv.js";
import type { KVGetResult } from "./types.js";
/**
 * A typed sub-store that wraps UpstreamKV with a prefix.
 * Provides CoW behavior (reads fall back to upstream).
 */
export declare class TypedUpstreamKV<V, M = undefined> {
    private parent;
    private prefix;
    constructor(parent: UpstreamKV<M>, prefix: string);
    private prefixKey;
    get(key: string): Promise<KVGetResult<V, M>>;
    set(key: string, value: V | ReadableStream<Uint8Array>, ...[metadata]: undefined extends M ? [M?] : [M]): Promise<void>;
    delete(key: string): Promise<void>;
    keys(prefix?: string): AsyncIterable<string>;
}
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