MAGETWO-59587: Debugging and profiling tools for UI Components and Javascript modules

Author: VladimirZaets

app/code/Magento/Ui/view/base/web/js/lib/knockout/template/engine.js

@@ -81,7 +81,6 @@ define([
                 });
             }
 
-
             return source;
         } else if (template.nodeType === 1 || template.nodeType === 8) {
             source = new ko.templateSources.anonymousTemplate(template);

app/code/Magento/Ui/view/base/web/js/lib/logger/logger-utils.js

@@ -17,7 +17,7 @@ define([], function () {
     /**
      * Method for logging asynchronous operations
      * @param {Promise} promise
-     * @param {object} config
+     * @param {Object} config
      */
     LogUtils.prototype.asyncLog = function (promise, config) {
         var levels,
@@ -29,11 +29,10 @@ define([], function () {
         messages = config.messages || this.createMessages();
         wait = config.wait || 5000;
 
-
         this.logger[levels.requested](messages.requested, config.data);
         setTimeout(function () {
             promise.state() === 'pending' ?
-                this.logger[levels.failed](messages.failed, config.data):
+                this.logger[levels.failed](messages.failed, config.data) :
                 this.logger[levels.loaded](messages.loaded, config.data);
         }.bind(this), wait)
     };

lib/web/mage/requirejs/text.js

@@ -100,16 +100,23 @@ define(['module'], function (module) {
             }
         }
 
+        /**
+         * @override
+         *
+         * @param {Event} evt
+         */
         xhr.onreadystatechange = function (evt) {
             var status, err;
             //Do not explicitly handle errors, those should be
             //visible via console output in the browser.
             if (xhr.readyState === 4) {
                 status = xhr.status || 0;
+
                 if (status > 399 && status < 600) {
                     //An http 4xx or 5xx error. Signal an error.
                     err = new Error(url + ' HTTP status: ' + status);
                     err.xhr = xhr;
+
                     if (fail) {
                         fail(err);
                     }