type LockHandle = {
    release: () => Promise<void>;
};
type Lock = {
    acquire: () => Promise<LockHandle>;
};
/**
 * A lock implementation only useful for applications with a single process/instance. Not useful for distributed applications.
 */
export declare class PromiseQueueLock implements Lock {
    private queue;
    private isLocked;
    acquire(): Promise<{
        release: () => Promise<void>;
    }>;
}
export {};