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spec/vendor/console-polyfill.js

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+// Console-polyfill. MIT license.
+// https://github.com/paulmillr/console-polyfill
+// Make it safe to do console.log() always.
+(function (con) {
+  'use strict';
+  var prop, method;
+  var empty = {};
+  var dummy = function() {};
+  var properties = 'memory'.split(',');
+  var methods = ('assert,count,debug,dir,dirxml,error,exception,group,' +
+     'groupCollapsed,groupEnd,info,log,markTimeline,profile,profileEnd,' +
+     'time,timeEnd,trace,warn').split(',');
+  while (prop = properties.pop()) con[prop] = con[prop] || empty;
+  while (method = methods.pop()) con[method] = con[method] || dummy;
+})(window.console = window.console || {});