Native alternativeObject.assign, or if deep clones are needed, use structuredClone — Use native JavaScript (Node 4.0.0+) Documentation
xtend
Extend like a boss
xtend is a basic utility library which allows you to extend an object by appending all of the properties from each object in a list. When there are identical properties, the right-most property takes precedence.
Examples
var extend = require("xtend")
// extend returns a new object. Does not mutate arguments
var combination = extend({
a: "a",
b: "c"
}, {
b: "b"
})
// { a: "a", b: "b" }