import type { Any, AnyObject, Options } from "../../types";
interface InputExpr {
    n: Any;
    input: Any;
}
/**
 * Returns an aggregation of the first n elements within a group. The elements returned are meaningful only if in a specified sort order.
 * If the group contains fewer than n elements, $firstN returns all elements in the group.
 */
export declare const $firstN: (coll: AnyObject[], expr: InputExpr, options: Options) => unknown[];
export {};