@blakek/deep
🐡 Get, set, remove, and test for deeply nested properties
clone-deep
Recursively (deep) clone JavaScript native types, like Object, Array, RegExp, Date as well as primitives.
klona
A tiny (240B to 501B) and fast utility to "deep clone" Objects, Arrays, Dates, RegExps, and more!
extend-shallow
Extend an object with the properties of additional objects. node.js/javascript util.