export interface CacheMechanism<R> {
    set: (key: string, data: R) => void;
    get: (key: string) => R | undefined;
}
export declare type ArgsType<T> = T extends (...args: infer U) => any ? U : [];
export interface CacheOptions<I extends any[], R> {
    cacheKeyFn?: (...args: I) => string;
    cacheMechanism?: CacheMechanism<R>;
}
/**
 * Function middleware that caches function output based on input
 * @param fn - target function
 * @param cacheFn - function that receives and return cache key
 * @signature
 *    P.cache(fn, options)
 * @signature
 *    P.cache(options)(fn)
 * @example
 *    const request = (url: string) => axios.get(url)
 *    const requestWithCache = P.cache(request, (url) => url)
 * @category Utility, Pipe
 */
export declare function cache<I extends (...args: any[]) => any>(fn: I, options?: CacheOptions<ArgsType<I>, ReturnType<I>>): I;
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