Extend an object with the properties of additional objects. node.js/javascript util.

Object.assign polyfill respecting !important notation.

Object.assign with sorted keys

Easily deep assign objects and merge arrays inside of them

Merge and extend objects.

Minimalist deep merging of Objects with the same function signature as Object.assign()

Delivers ponyfills as modules, uses native alternatives first when available

Object.assign polyfill copied from MDN

Deep merge objects, better version of native Object.assign.