rfdc
Really Fast Deep Clone
mixin-object
Mixin the own and inherited properties of other objects onto the first object. Pass an empty object as the first arg to shallow clone.
has-own-deep
Returns true if an object has an own, nested property using dot notation paths ('a.b.c').
define-property
Define a non-enumerable property on an object. Uses Reflect.defineProperty when available, otherwise Object.defineProperty.