/**
 * Util class to track usages of something
 */
export default class UsageCounter {
    private _usages;
    /**
     * Acquires a usage. If already acquired by specified usage, the count won't be incremented
     * @param key key to count
     * @param usage usage
     */
    acquire(key: string, usage: any): void;
    /**
     * Releases a usage. If already not acquired by specified usage, the counte won't be decremented
     * @param key key to count
     * @param usage usage
     */
    release(key: string, usage: any): void;
    /**
     * Releases all usages of a key
     * @param key key to release
     */
    releaseAll(key: string): void;
    /**
     * Returns whether a key is currently in use
     * @param key key to check
     * @returns is in use
     */
    isInUse(key: string): boolean;
    /**
     * Returns key usage IDs
     * @param key key to count
     * @returns usages
     */
    getUsages(key: any): Set<any>;
    /**
     * Returns if key is acquired by usage
     * @param key key to check
     * @param usage usage
     * @returns is acquired
     */
    isAcquiredBy(key: string, usage: any): boolean;
    /**
     * Returns keys which are acquired by specific usage
     * @param usage usage
     * @returns keys acquired by the specified usage
     */
    getAcquiredBy(usage: string): string[];
}