import type { BulkheadOptions, BulkheadHandle } from '../types.js';
/**
 * Creates a bulkhead (concurrency limiter) policy that limits the number
 * of concurrent executions of the wrapped operation.
 *
 * Returns an object with `execute` (the policy function) and `handle`
 * (an interface to inspect the bulkhead's running / queued counts).
 *
 * @example
 * ```ts
 * const bh = bulkhead({ maxConcurrent: 5, maxQueue: 10 });
  * const result = await bh.execute(() => callApi());
 * console.log(bh.handle.running); // number of active calls
 * ```
 */
export declare function bulkhead(options?: BulkheadOptions): {
    execute: <T>(fn: () => Promise<T>) => Promise<T>;
    handle: BulkheadHandle;
};
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