import predicateType from '../helpers/predicateType';
/**
 * Reduces a collection to a single value by iterating over the elements of the collection.
 *
 * @since 1.0.0
 *
 * @template T
 * @param {Array<T> | Object} collection - The collection to iterate over.
 * @param {Function} [iteratee=identity] - The function invoked per iteration.
 * @param {*} [initialValue] - The initial value.
 * @returns {*} - Returns the accumulated value.
 *
 * @example
 * reduce([1, 2, 3], (acc, n) => acc + n); // => 6
 *
 * reduce(
 *  { a: 1, b: 2, c: 1 },
 *  (result, value, key) => {
 *    (result[value] || (result[value] = [])).push(key);
 *    return result;
 *  },
 *  {}
 * );
 * // => { '1': ['a', 'c'], '2': ['b'] }
 */
declare const reduce: <T>(collection: Object | T[], iteratee: predicateType<T> | undefined, initialValue: any) => T;
export default reduce;