import type { Union } from 'ts-toolbelt';
/**
 * Assigns own and inherited enumerable string keyed properties of source
 * objects to the destination object for all destination properties that
 * resolve to `undefined`. Source objects are applied from left to right.
 * Once a property is set, additional values of the same property are ignored.
 *
 * **Note:** This method mutates `object`.
 *
 * @param object The destination object.
 * @param sources The source objects.
 * @return Returns `object`.
 * @example
 *
 * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 })
 * // => { 'a': 1, 'b': 2 }
 */
export declare const defaults: <T extends object, S extends object[]>(object: T, ...sources: S) => T & Union.IntersectOf<S[number]>;