js/src/jit-test/tests/basic/freeze-builtins.js


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var g = newGlobal({freezeBuiltins: true});

g.evaluate("" + function checkFrozen(name) {
  // Check constructor on the global is non-writable/non-configurable.
  let desc = Object.getOwnPropertyDescriptor(this, name);
  assertEq(desc.writable, false);
  assertEq(desc.configurable, false);

  // Constructor must be frozen.
  let ctor = desc.value;
  assertEq(Object.isFrozen(ctor), true);

  // Prototype must be sealed.
  if (ctor.prototype) {
    assertEq(Object.isSealed(ctor.prototype), true);
  }
});

g.checkFrozen("Object");
g.checkFrozen("Array");
g.checkFrozen("Function");