export type FetchResult<V> = {
    value: V;
    maxAge?: number;
};
export type DiskStats = {
    hits: number;
    total: number;
    name: string;
};
export type LRUStats = {
    itemCount: number;
    length: number;
    disposedItems: number;
    hitRate: number | undefined;
    hits: number;
    max: number;
    name: string;
    total: number;
};
export type MultilayerStats = {
    hitRate: number | undefined;
    hits: number;
    total: number;
    name: string;
};
export type LRUDiskCacheOptions = {
    /**
     * The maximum size of the cache, checked by applying the length
     * function to all values in the cache. Not setting this is kind of silly,
     * since that's the whole purpose of this lib, but it defaults to `Infinity`.
     */
    max?: number;
    /**
     * Maximum age in ms. Items are not pro-actively pruned out as they age,
     * but if you try to get an item that is too old, it'll drop it and return
     * undefined instead of giving it to you.
     */
    maxAge?: number;
    /**
     * By default, if you set a `maxAge`, it'll only actually pull stale items
     * out of the cache when you `get(key)`. (That is, it's not pre-emptively
     * doing a `setTimeout` or anything.) If you set `stale:true`, it'll return
     * the stale value before deleting it. If you don't set this, then it'll
     * return `undefined` when you try to get a stale entry,
     * as if it had already been deleted.
     */
    stale?: boolean;
};