import { Callback } from '../../types/Callback.js';
/**
 * Calls a defined callback function on each element of an array until
 * one returns `true` or there are no more elements.
 *
 * @param callback - A function that accepts up to three arguments. The
 *  first method calls the callback function up to one time for each
 *  element in the array.
 *
 * @returns The first element where the callback returned true, or
 *  `undefined`
 */
export declare const first: <T>(arr: readonly T[], callback?: Callback<T, boolean>) => T | undefined;