/**
 * Creates a concurrency limiter that ensures at most `concurrency` async tasks
 * run simultaneously. Returns a scheduler function with the same call signature
 * as the p-limit package: `limit(fn, ...args)` enqueues the task and returns a
 * Promise that resolves/rejects with the task's result.
 */
export declare function pLimit(concurrency: number): <T>(fn: () => T | Promise<T>) => Promise<T>;