es-abstract-has-property
A method to determine whether an object has a property with the specified property key. The property may be either an own or inherited. This method follows ECMAScript's specification for the 'HasProperty' abstract operation.
es-abstract-to-length
A method to convert an argument to an integer suitable for use as the length of an array-like object. This method follows ECMAScript's specification for the 'ToLength' abstract operation.