import { RequestInfo, RequestInit } from "node-fetch";
export declare type Prefetch = ReturnType<typeof createPrefetch>;
export interface CacheEntry {
    data: any;
    meta: {
        prefetch: string | null;
        hash: string | null;
    };
}
export declare function getCacheEntry(method: "getStaticPaths" | "getStaticProps", fileName: string): Promise<CacheEntry>;
export declare function createPrefetch(previousKey: string | null): (info: RequestInfo, init?: RequestInit) => Promise<string | null>;
export declare const isKeyValid: (previousKey: string | null, key: string | null) => boolean;