import { ArrBase } from '../typings/types';
type MapKey = string | number;
type MapBy<T, K extends keyof T> = K | K[] | ArrBase<T, MapKey>;
interface ArrayToObject {
    <T, K extends keyof T>(mapBy: MapBy<T, K> | undefined | null, arr: ArrayLike<T>): Record<MapKey, T>;
    <T, K extends keyof T>(mapBy: MapBy<T, K> | undefined | null): (arr: ArrayLike<T>) => Record<MapKey, T>;
}
/**
 * Converts an array into an object.
 *
 * @param {Function|String|Array} mapBy The function invoked per element.
 * @param {Array} arr
 * @returns {Object} Returns the converted object.
 *
 * @comment
 *    This function is initially forked from https://github.com/theZieger/arrayToObject
 *
 * @example
 *
 *     // mapBy is a function
 *     toObject(x => x.id, [{id: 1, name: 'foo'}, {id: 2, name: 'bar'}]); //=> {1: {id: 1, name: 'foo'}, 2: {id: 2, name: 'bar'}}
 *     toObject(x => x.id)([{id: 1, name: 'foo'}, {id: 2, name: 'bar'}]); //=> {1: {id: 1, name: 'foo'}, 2: {id: 2, name: 'bar'}}
 *
 *     // mapBy is a string
 *     toObject('id', [{id: 1, name: 'foo'}, {id: 2, name: 'bar'}]); //=> {1: {id: 1, name: 'foo'}, 2: {id: 2, name: 'bar'}}
 *     toObject('id')([{id: 1, name: 'foo'}, {id: 2, name: 'bar'}]); //=> {1: {id: 1, name: 'foo'}, 2: {id: 2, name: 'bar'}}
 *
 *     // mapBy is an array
 *     toObject(['id', 'name'], [{id: 1, name: 'foo'}, {id: 2, name: 'bar'}]); //=> {'1_foo': {id: 1, name: 'foo'}, '2_bar': {id: 2, name: 'bar'}}
 *     toObject(['id', 'name'])([{id: 1, name: 'foo'}, {id: 2, name: 'bar'}]); //=> {'1_foo': {id: 1, name: 'foo'}, '2_bar': {id: 2, name: 'bar'}}
 *
 *     // mapBy is undefined, null, '', [], or any other value
 *     toObject(null, [{id: 1, name: 'foo'}, {id: 2, name: 'bar'}]); //=> {0: {id: 1, name: 'foo'}, 1: {id: 2, name: 'bar'}}
 *     toObject(undefined, [{id: 1, name: 'foo'}, {id: 2, name: 'bar'}]); //=> {0: {id: 1, name: 'foo'}, 1: {id: 2, name: 'bar'}}
 *     toObject('', [{id: 1, name: 'foo'}, {id: 2, name: 'bar'}]); //=> {0: {id: 1, name: 'foo'}, 1: {id: 2, name: 'bar'}}
 *     toObject([], [{id: 1, name: 'foo'}, {id: 2, name: 'bar'}]); //=> {0: {id: 1, name: 'foo'}, 1: {id: 2, name: 'bar'}}
 */
export declare const toObject: ArrayToObject;
export default toObject;