/**
 * Per-key semaphore registry for serializing async operations.
 * @module
 */
/// <amd-module name="file:///home/runner/work/hyperliquid/hyperliquid/src/api/exchange/_methods/_base/_semaphore.ts" />
/**
 * Acquires a lock for the given key, executes the provided async function, and releases the lock.
 *
 * @param key The key to lock on.
 * @param fn The async function to execute while holding the lock.
 * @return The result of the async function.
 */
export declare function withLock<K, T>(key: K, fn: () => Promise<T>): Promise<T>;