Static method Object.preventExtensions()

The Object.preventExtensions() static method
prevents new properties from ever being added to
an object (i.e. prevents future extensions to the
object). It also prevents the object’s prototype
from being re-assigned.

const object1 = {};

Object.preventExtensions(object1);

try {
  Object.defineProperty(object1, 'property1', {
    value: 42
  });
} catch (e) {
  console.log(e);
  // Expected output: TypeError: Cannot define property property1, object is not extensible
}