console-performance/console-performance.js

Simple performance.now shim with automatic logging

(function () {

	'use strict';

	/** Shim from https://gist.github.com/davidwaterston/2982531 */
	var performanceNow = (function() {
	 
		var performance = (typeof window !== 'undefined' && window.performance) ? window.performance : {};

		performance.now = (function() {
			return performance.now    ||
			performance.webkitNow     ||
			performance.msNow         ||
			performance.oNow          ||
			performance.mozNow        ||
			function() { return new Date().getTime(); };
		})();
	          
	  return performance.now();         
	 
	});

	var consolePerformance = {

		_tests: [],

		start: function (tag, text, clean) {

			if ((typeof DEBUG !== 'undefined' && DEBUG) || (typeof process === 'object' && process.env.DEBUG)) {
				this._tests[tag] = performanceNow();

				if (!text) {
					text = tag;
				}

				if (clean) {
					return console.log(text, tag);
				}
				
				if (typeof window !== 'undefined') {
					return console.log('%c' + text, 'color: #27ae60', tag);
				}

				console.log('\x1b[32m%s\x1b[0m ', text, tag);
			}

		},

		end: function (tag, text, clean) {

			if ((typeof DEBUG !== 'undefined' && DEBUG) || (typeof process === 'object' && process.env.DEBUG)) {
				if (!this._tests.hasOwnProperty(tag)) {
					return false;
				}

				var now = performanceNow(), test = this._tests[tag], diff = now - test, logText;

				delete this._tests[tag];

				if (!text) {
					logText = tag;
				} else {
					logText = text;
				}

				if (clean) {
					return console.log(logText, tag, diff);
				}

				if (typeof window !== 'undefined') {
					if (text) {
						return console.log('%c' + logText, 'color: #c0392b', tag, diff);
					}

					return console.log('%c' + logText, 'color: #c0392b', tag, diff);
				}

				if (text) {
					return console.log('\x1b[31m%s\x1b[0m ', logText, tag, diff);
				}

				return console.log('\x1b[31m%s\x1b[0m ', logText, tag, diff);
			}

		}

	};

	if (typeof module !== 'undefined' && module.exports) {
		module.exports = consolePerformance;
	} else if (typeof this !== 'undefined') {
		this.consolePerformance = consolePerformance;
	}

}).call(this);