import log from './log';
export declare class Mutex<I extends string = string> {
    private readonly logger;
    private readonly unlockQueue;
    private acquiredIdentifier;
    private readonly prefix;
    constructor(prefix?: string, logger?: log.ReadonlyLogger);
    isAcquired(): boolean;
    /** Acquires the mutex, as soon as possible. */
    acquire(identifier: I): Promise<Disposable>;
    /** Releases your hold on the mutex. */
    release(): void;
}