export declare class Lock {
    private _lockP;
    lock(): Promise<() => void>;
    withLock<R>(f: () => R | Promise<R>): Promise<R>;
}
export declare class RWLock {
    private _lock;
    private _writeP;
    private _readP;
    read(): Promise<() => void>;
    withRead<R>(f: () => R | Promise<R>): Promise<R>;
    write(): Promise<() => void>;
    withWrite<R>(f: () => R | Promise<R>): Promise<R>;
}