import type { Merge } from 'type-fest';
type ObjectWithPotentialNesting = Record<string, unknown>;
/**
 * Recursively assigns default properties to a new object, without mutating
 * the target object in the process.
 *
 * - Primitive override types such as string, number, boolean, or Symbol always
 *   replace the default's equivalent key
 * - Default keys containing Arrays or ES6 classes are replaced rather than merged
 * - Default keys containing POJOs are merged if the override's key is also a POJO

 * NOTE: The root is a special case, in that if you pass in an empty object
 * as the new object, no overrides will take place and you will get the original
 * object back. Within the tree however, an empty object will completely clobber
 * from the corresponding subtree. To the greatest extent possible, the types
 * try to model this behavior but some situations will require using generics
 * (recommended) or explicit casts.
 *
 * @param defaults the default object
 * @param overrides the object to merge on top of defaults
 * @returns object with newly merged features
 */
export declare function defaultsDeep<Defaults extends ObjectWithPotentialNesting, Overrides extends ObjectWithPotentialNesting, Output extends Merge<Defaults, Overrides> = Merge<Defaults, Overrides>>(defaults: Defaults, overrides: Overrides): Output;
export {};
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