define-data-property
Define a data property on an object. Will fall back to assignment in an engine without descriptors.
hasown
A robust, ES3 compatible, "has own property" predicate.
has-property-descriptors
Does the environment have full property descriptor support? Handles IE 8's broken defineProperty/gOPD.
dot-prop
Get, set, or delete a property from a nested object using a dot path