import deepmerge from "deepmerge";
import { Assign, DeepRequired, Diff } from 'utility-types';
/**
 * Merges two objects, with properties from the second object taking precedence over the first object.
 * If a property is found on both objects, the property from the first object is returned.
 * @param x - The first object to merge.
 * @param y - The second object to merge.
 * @param options - The options for merging.
 * @returns The merged object.
 */
export declare const defaults: <T extends object, Y extends object = Partial<T>>(x: T, y: Y, options?: deepmerge.Options) => Assign<Diff<T, Y>, DeepRequired<Y>>;
/**
 * Gets the item IDs from the new and old data.
 * @param new_value - The new value.
 * @param old_value - The old value.
 * @returns The item IDs.
 */
export declare const getItemIdsFromOldAndNewData: <T extends string | string[] | null>(new_value?: T, old_value?: T) => T;
/**
 * Checks if the current environment is development.
 * @returns A boolean indicating if the current environment is development.
 */
export declare const isDevelopmentDev: () => boolean;
/**
 * Checks if the current environment is production.
 * @returns A boolean indicating if the current environment is production.
 */
export declare const isProductionDev: () => boolean;
/**
 * Merges two objects deeply, excluding properties with null or undefined values.
 * @param x - The first object to merge.
 * @param y - The second object to merge.
 * @returns The merged object.
 */
export declare function deepMergeUnlessNull<X extends object, Y extends object>(x: X, y: Y): X & Y;