How to recursively merge JavaScript objects?

Question

JavaScript

It is necessary to combine two or more objects together with properties and methods, and it is recursive, so that all nested objects also pass into the result.
Are there built-in methods?
Maybe something appeared in ES6?
Or some library can be used?

Answer 1

Lodash has a defaultsDeep function (I don't remember the exact name). It seems to do just that. Look at the docks