ui/webui/resources/js/assert.js

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * @fileoverview Assertion support.
   7  */
   8
   9 /**
  10  * Simple common assertion API
  11  * @param {*} condition The condition to test.  Note that this may be used to
  12  *     test whether a value is defined or not, and we don't want to force a
  13  *     cast to Boolean.
  14  * @param {string=} opt_message A message to use in any error.
  15  */
  16 function assert(condition, opt_message) {
  17   'use strict';
  18   if (!condition) {
  19     var msg = 'Assertion failed';
  20     if (opt_message)
  21       msg = msg + ': ' + opt_message;
  22     throw new Error(msg);
  23   }
  24 }