What will be the effect of using Object.freeze on an object?

Using Object.freeze on an object has a significant effect on its properties, specifically making all existing properties non-configurable. When an object is frozen, it cannot be modified in terms of adding new properties, removing existing properties, or changing the configuration attributes of existing properties, which include whether they are writable or configurable.

Once frozen, the properties that exist on the object can no longer be deleted or redefined. This means that the structure of the object and its properties become immutable, or unchangeable. While the values of the properties can still be changed if they are not specifically made non-writable, the properties themselves cannot be redefined or removed, leading to the conclusion that they are effectively non-configurable.

This non-configurability is essential in scenarios where you want to protect an object from unwanted modifications, ensuring its integrity throughout the code. For example, if you're dealing with configuration settings or an object that should represent a constant state, freezing the object is a straightforward approach to enforce its immutability.