Gets the property of target, equivalent to target[propertyKey] when receiver === target.
target[propertyKey]
receiver === target
Object that contains the property on itself or in its prototype chain.
The property name.
Optional
The reference to use as the this value in the getter function, if target[propertyKey] is an accessor property.
this
Gets the property of target, equivalent to
target[propertyKey]
whenreceiver === target
.