/**
 * Normalize an array of object like the following :
 *
 * In this example, key = 'id'
 * [{id:"x", other: "some value"},{id:"y", other: "some value"}]
 *
 * TO
 *
 * {
 *  x: {id:"x", other: "some value"}
 *  y: {id:"y", other: "some value"}
 * }
 * @param {*} arr input array of object to convert
 * @param {*} key object key to extract
 */
import { Index } from './index';
export declare const normalizeArray: <T, K extends keyof T>(arr: Array<T>, key: K) => Index<T>;
export declare const denormalize: <T>(index: Index<T>) => Array<[string, T]>;