import type { Callback } from '../../types/Callback.js';
declare global {
    interface ReadonlyArray<T> {
        /**
         * Calls a defined callback function on each element of an array, and
         * returns an array that contains all of the results that are not `null`
         * or `undefined`.
         *
         * @param callback - A function that accepts up to three arguments. The
         *  compactMap method calls the callback function one time for each
         *  element in the array.
         *
         * @returns A new array with the results
         */
        compactMap<U>(callback: Callback<T, U | undefined | null>): Array<U>;
    }
    interface Array<T> {
        /**
         * Calls a defined callback function on each element of an array, and
         * returns an array that contains all of the results that are not `null`
         * or `undefined`.
         *
         * @param callback - A function that accepts up to three arguments. The
         *  compactMap method calls the callback function one time for each
         *  element in the array.
         *
         * @returns A new array with the results
         */
        compactMap<U>(callback: Callback<T, U | undefined | null>): Array<U>;
    }
}