/**
 * A reader-writer lock to manage concurrent access.
 * Allows multiple readers or one writer at a time.
 */
export declare class SingleWriterMultiReaderLock {
    private readonly maxQueued;
    private readers;
    private writerActive;
    private readonly readerQueue;
    private readonly writerQueue;
    constructor(maxQueued?: number);
    private assertQueueCapacity;
    private checkQueues;
    withReadLock<T>(fn: () => Promise<T>): Promise<T>;
    withWriteLock<T>(fn: () => Promise<T>): Promise<T>;
}
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