/**
 * Runs async work under reader/writer exclusion with writer priority.
 * Note: queued writers block newly arriving readers to reduce reload latency.
 */
export declare class ReadWriteLock {
    private activeReaders;
    private writerActive;
    private waitingReaders;
    private waitingWriters;
    inReadLock<T>(func: () => Promise<T> | T): Promise<T>;
    inWriteLock<T>(func: () => Promise<T> | T): Promise<T>;
    private acquireRead;
    private releaseRead;
    private acquireWrite;
    private releaseWrite;
}
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