define-data-property
Define a data property on an object. Will fall back to assignment in an engine without descriptors.
es-object-atoms
ES Object-related atoms: Object, ToObject, RequireObjectCoercible
object.groupby
An ESnext spec-compliant `Object.groupBy` shim/polyfill/replacement that works as far down as ES3.
is-plain-object
Returns true if an object was created by the `Object` constructor, or Object.create(null).