import Lock from './Lock';
/** asynchronous unix-like semaphore */
export declare class Semaphore {
	lock: Lock;
	value: number;
	/** value is the initial number of allowed concurrent tasks */
	constructor(value?: bigint | number | string);
	/** increments semaphore */
	post(): Promise<number>;
	/** decrements semaphore */
	wait(): Promise<number>;
}