Object.defineProperty()

The Object.defineProperty() static method defines a new property directly on an object, or modifies an existing property on an object, and returns the object.

Object.defineProperty() allows a precise addition to or modification of a property on an object. Normal property addition through assignment creates properties which show up during property enumeration (for…in, Object.keys(), etc.), whose values may be changed and which may be deleted. This method allows these extra details to be changed from their defaults. By default, properties added using Object.defineProperty() are not writable, not enumerable, and not configurable. In addition, Object.defineProperty() uses the [[[DefineOwnProperty]]](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/Proxy/defineProperty) internal method, instead of [[[Set]]](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/Proxy/set), so it does not invoke setters, even when the property is already present.

Syntax example: Object.defineProperty(obj, prop, descriptor)