object.assign

ES6 spec-compliant Object.assign shim. From https://github.com/es-shims/es6-shim

v4.1.5 URL: https://unpkg.com/object.assign@4.1.5/index.js

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Object.assign assign ES6 extend $.extend jQuery _.extend Underscore es-shim API polyfill shim

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

make-error

Make your own error types!

v1.3.6 URL: https://unpkg.com/make-error@1.3.6/index.js

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create custom derive error errors extend extending extension factory inherit make subclass

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

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