define-properties

Define multiple non-enumerable properties at once. Uses `Object.defineProperty` when available; falls back to standard assignment in older engines.

v1.2.1 URL: https://unpkg.com/define-properties@1.2.1/index.js

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Object.defineProperty Object.defineProperties object property descriptor descriptor define ES5

merge-descriptors

Merge objects using their property descriptors

v2.0.0 URL: https://unpkg.com/merge-descriptors@2.0.0/index.js

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merge descriptors object property properties merging getter setter

rfdc

Really Fast Deep Clone

v1.4.1 URL: https://unpkg.com/rfdc@1.4.1/index.js

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object obj properties clone copy deep recursive key keys values prop deep-clone deepclone deep-copy deepcopy fast performance performant fastclone fastcopy fast-clone fast-deep-clone fast-copy fast-deep-copy

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

to-fast-properties

Force V8 to use fast properties for an object

v4.0.0 URL: https://unpkg.com/to-fast-properties@4.0.0/index.js

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object properties props v8 optimize fast convert mode