freeze-builtins.js

Enable keyboard shortcuts

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");

g.checkFrozen("ArrayBuffer");

g.checkFrozen("Int32Array");

g.checkFrozen("Number");

g.checkFrozen("String");

g.checkFrozen("Proxy");

g.checkFrozen("Promise");

g.checkFrozen("RegExp");

g.checkFrozen("Map");

g.checkFrozen("WeakMap");

g.checkFrozen("WeakRef");

g.checkFrozen("Error");

g.checkFrozen("TypeError");

g.checkFrozen("JSON");

g.checkFrozen("Math");