extend-shallow

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

v3.0.2 URL: https://unpkg.com/extend-shallow@3.0.2/index.js

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assign clone extend merge obj object object-assign object.assign prop properties property props shallow util utility utils value

object-assign

ES2015 `Object.assign()` ponyfill

v4.1.1 URL: https://unpkg.com/object-assign@4.1.1/index.js

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object assign extend properties es2015 ecmascript harmony ponyfill prollyfill polyfill shim browser

error-ex

Easy error subclassing and stack customization

v1.3.2 URL: https://unpkg.com/error-ex@1.3.2/index.js

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error errors extend extending extension subclass stack custom

xtend

extend like a boss

v4.0.2 URL: https://unpkg.com/xtend@4.0.2/immutable.js

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extend merge options opts object array

deepmerge

A library for deep (recursive) merging of Javascript objects

v4.3.1 URL: https://unpkg.com/deepmerge@4.3.1/dist/cjs.js

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merge deep extend copy clone recursive