/**
 * The source object's properties will be merged to the target object.
 *
 * @param {Record<string, any>} target Target object.
 * @param {Record<string, any>} source Source object which will be merged to target object.
 *
 * @return {Record<string, any>} The merged object.
 */
export declare function extendObject(target: Record<string, any>, source: Record<string, any>): Record<string, any>;