src/v8/test/intl/overrides/security.js

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// Test that we always use original Intl.Constructors for toLocaleString calls.

function throwError() {
  throw new Error('Malicious method invoked.');
}

Intl.Collator = Intl.NumberFormat = Intl.DateTimeFormat = throwError;

Intl.Collator.prototype.compare = throwError;
Intl.NumberFormat.prototype.format = throwError;
Intl.DateTimeFormat.prototype.format = throwError;

// Make sure constructors actually throw now.
assertThrows('new Intl.Collator()');
assertThrows('new Intl.NumberFormat()');
assertThrows('new Intl.DateTimeFormat()');

// None of these should throw.
assertDoesNotThrow('new Date().toLocaleString()');
assertDoesNotThrow('new Date().toLocaleDateString()');
assertDoesNotThrow('new Date().toLocaleTimeString()');
assertDoesNotThrow('new Number(12345.412).toLocaleString()');
assertDoesNotThrow('new String(\'abc\').localeCompare(\'bcd\')');