Скачать или смотреть Object.freeze() Method in JavaScript

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The Object.freeze() method in JavaScript is used to freeze an object, meaning it prevents new properties from being added, existing properties from being removed, and existing property values or descriptors from being changed. Essentially, it makes an object immutable (non-editable).

Once an object is frozen:

You can't add new properties.

You can't delete existing properties.

You can't change the values of existing properties.

You can't reconfigure the property descriptors (like writable, enumerable, etc.).

However, note that Object.freeze() performs a shallow freeze. Nested objects are not frozen unless you explicitly freeze them as well.