/**
 * The MIT License
 * Copyright © 2021-present KuFlow S.L.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
type CacheLoader<V> = () => Promise<V> | V;
type TimeUnit = 'hour' | 'hours' | 'minute' | 'minutes' | 'second' | 'seconds' | 'millisecond' | 'milliseconds';
export interface CacheOptions<K> {
    expireAfterAccess: number;
    expireAfterWrite: number;
    removalListener: (key: K) => void;
}
export declare class Cache<K, V> {
    private readonly cache;
    private readonly expireAfterAccess;
    private readonly expireAfterWrite;
    private readonly removalListener;
    private readonly inProgressLoads;
    constructor(opts: CacheOptions<K>);
    /**
     * Retrieve a value from the cache, or load it using the provided loader if absent or expired.
     * Automatically refreshes the TTL upon access.
     * @param key - The key of the value to retrieve.
     * @param loader - A loader function to fetch the value if it's not in cache.
     * @returns The value associated with the key.
     */
    get(key: K, loader: CacheLoader<V>): Promise<V>;
    /**
     * Add a key-value pair to the cache with an expiration time.
     * @param key - The key to store.
     * @param value - The value to store.
     */
    put(key: K, value: V): void;
    /**
     * Invalidate a specific key from the cache.
     * @param key - The key to remove.
     */
    invalidate(key: K): void;
    /**
     * Invalidate all items from the cache.
     */
    invalidateAll(): void;
    /**
     * Create or Update the cache cached entry.
     * @param key - The key of the entry.
     * @param value - The value of the entry.
     * @param ttl - The ttl of the entry.
     */
    private createOrUpdateCacheEntry;
    /**
     * Deletes a cache entry identified by the specified key.
     * This will also clear any associated timeout for the cache entry.
     *
     * @param key - The key of the cache entry to be deleted.
     * @return No return value.
     */
    private deleteCacheEntry;
    private clearTimeoutCacheEntry;
}
export declare class CacheBuilder<K, V> {
    private expireAfterAccess;
    private expireAfterWrite;
    private removalListener;
    static builder<K, V>(): CacheBuilder<K, V>;
    /**
     * Set the expiration time for the cache after accessing the element.
     * @param time - The time-to-live duration.
     * @param unit - The time unit (such as milliseconds, seconds, minutes, etc.).
     */
    withExpireAfterAccess(time: number, unit: TimeUnit): this;
    /**
     * Set the expiration time for the cache after write the element.
     * @param time - The time-to-live duration.
     * @param unit - The time unit (such as milliseconds, seconds, minutes, etc.).
     */
    withExpireAfterWrite(time: number, unit: TimeUnit): this;
    /**
     * Sets a removal listener function to be called when an entry is removed.
     *
     * @param {Function} removalListener - A function that gets called with the key of the removed entry.
     * @return {this} Returns the current instance to allow method chaining.
     */
    withRemovalListener(removalListener: (key: K) => void): this;
    private toMillis;
    private multiplier;
    /**
     * Build and return the Cache instance configured with the specified options.
     */
    build(): Cache<K, V>;
}
export {};