import { Cache, Logger } from "./types";
/**
 * Create a cached function that updates the value asynchronously.
 *
 * The value is updated every `ttl` milliseconds.
 * If the value is older than `staleTtl` milliseconds, a warning is logged.
 *
 * @typeParam T - The type of the value.
 * @param ttl - The time-to-live in milliseconds.
 * @param staleTtl - The time-to-live after which a warning is logged.
 * @param logger - The logger to use.
 * @param fn - The function to call to get the value.
 * @returns The cache object.
 **/
export default function periodicallyUpdatingCache<T>(ttl: number, staleTtl: number, logger: Logger | undefined, fn: () => Promise<T | undefined>): Cache<T>;
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