use const when var immutable, no need for var used only once

assets/js/core/WakaTimeCore.js

@@ -12,7 +12,6 @@ var in_array = require('./../helpers/in_array');
 var contains = require('./../helpers/contains');
 
 class WakaTimeCore {
-
   constructor() {
     this.tabsWithDevtoolsOpen = [];
   }
@@ -33,17 +32,14 @@ class WakaTimeCore {
     $.ajax({
       url: config.summariesApiUrl + '?start=' + today + '&end=' + today,
       dataType: 'json',
-            success: (data) => {
+      success: data => {
-
         deferredObject.resolve(data.data[0].grand_total);
-
       },
       error: (xhr, status, err) => {
-
         console.error(config.summariesApiUrl, status, err.toString());
 
         deferredObject.resolve(false);
-            }
+      },
     });
 
     return deferredObject.promise();
@@ -60,13 +56,13 @@ class WakaTimeCore {
     $.ajax({
       url: config.currentUserApiUrl,
       dataType: 'json',
-            success: (data) => {
+      success: data => {
         deferredObject.resolve(data.data);
       },
       error: (xhr, status, err) => {
         console.error(config.currentUserApiUrl, status, err.toString());
         deferredObject.resolve(false);
-            }
+      },
     });
 
     return deferredObject.promise();
@@ -77,19 +73,21 @@ class WakaTimeCore {
    * and sends it to WakaTime for logging.
    */
   recordHeartbeat() {
-        browser.storage.sync.get({
+    browser.storage.sync
+      .get({
         loggingEnabled: config.loggingEnabled,
         loggingStyle: config.loggingStyle,
         blacklist: '',
-            whitelist: ''
+        whitelist: '',
-        }).then((items) => {
+      })
+      .then(items => {
         if (items.loggingEnabled === true) {
           changeExtensionState('allGood');
 
-                browser.idle.queryState(config.detectionIntervalInSeconds).then((newState) => {
+          browser.idle.queryState(config.detectionIntervalInSeconds).then(newState => {
             if (newState === 'active') {
               // Get current tab URL.
-                        browser.tabs.query({currentWindow: true, active: true}).then((tabs) => {
+              browser.tabs.query({ currentWindow: true, active: true }).then(tabs => {
                 if (tabs.length == 0) return;
 
                 var currentActiveTab = tabs[0];
@@ -101,13 +99,15 @@ class WakaTimeCore {
                 }
 
                 if (items.loggingStyle == 'blacklist') {
-                                if (! contains(currentActiveTab.url, items.blacklist)) {
+                  if (!contains(currentActiveTab.url, items.blacklist)) {
-                                    this.sendHeartbeat({
+                    this.sendHeartbeat(
+                      {
                         url: currentActiveTab.url,
                         project: null,
-                                    }, debug);
+                      },
-                                }
+                      debug,
-                                else {
+                    );
+                  } else {
                     changeExtensionState('blacklisted');
                     console.log(currentActiveTab.url + ' is on a blacklist.');
                   }
@@ -117,18 +117,15 @@ class WakaTimeCore {
                   var heartbeat = this.getHeartbeat(currentActiveTab.url, items.whitelist);
                   if (heartbeat.url) {
                     this.sendHeartbeat(heartbeat, debug);
-                                }
+                  } else {
-                                else {
                     changeExtensionState('whitelisted');
                     console.log(currentActiveTab.url + ' is not on a whitelist.');
                   }
                 }
-
               });
             }
           });
-            }
+        } else {
-            else {
           changeExtensionState('notLogging');
         }
       });
@@ -144,17 +141,17 @@ class WakaTimeCore {
    * @returns {object}
    */
   getHeartbeat(url, list) {
-        var lines = list.split('\n');
+    const projectIndicatorCharacters = '@@';
 
+    const lines = list.split('\n');
     for (var i = 0; i < lines.length; i++) {
       // strip (http:// or https://) and trailing (`/` or `@@`)
-          var line = lines[i];
+      var cleanLine = lines[i]
-          var cleanLine = line.trim().replace(/(\/|@@)$/, '').replace(/^(?:https?:\/\/)?/i, '');
+        .trim()
-          var emptyLine = cleanLine === '';
+        .replace(/(\/|@@)$/, '')
-          if (emptyLine) {
+        .replace(/^(?:https?:\/\/)?/i, '');
-            continue;
+      if (cleanLine === '') continue;
-          }
+
-          var projectIndicatorCharacters = '@@';
       var projectIndicatorIndex = cleanLine.lastIndexOf(projectIndicatorCharacters);
       var projectIndicatorExists = projectIndicatorIndex > -1;
       var projectName = null;
@@ -162,7 +159,9 @@ class WakaTimeCore {
       if (projectIndicatorExists) {
         var start = projectIndicatorIndex + projectIndicatorCharacters.length;
         projectName = cleanLine.substring(start);
-            urlFromLine = cleanLine.replace(cleanLine.substring(projectIndicatorIndex), '').replace(/\/$/, '');
+        urlFromLine = cleanLine
+          .replace(cleanLine.substring(projectIndicatorIndex), '')
+          .replace(/\/$/, '');
       }
       var schemaHttpExists = url.match(/^http:\/\//i);
       var schemaHttpsExists = url.match(/^https:\/\//i);
@@ -173,12 +172,15 @@ class WakaTimeCore {
       if (schemaHttpsExists) {
         schema = 'https://';
       }
-          var cleanUrl = url.trim().replace(/(\/|@@)$/, '').replace(/^(?:https?:\/\/)?/i, '');
+      var cleanUrl = url
+        .trim()
+        .replace(/(\/|@@)$/, '')
+        .replace(/^(?:https?:\/\/)?/i, '');
       var startsWithUrl = cleanUrl.toLowerCase().indexOf(urlFromLine.toLowerCase()) > -1;
       if (startsWithUrl) {
         return {
           url: schema + urlFromLine,
-              project: projectName
+          project: projectName,
         };
       }
     }
@@ -205,11 +207,10 @@ class WakaTimeCore {
       time: moment().format('X'),
       project: heartbeat.project || '<<LAST_PROJECT>>',
       is_debugging: debug,
-            plugin: 'browser-wakatime/' + config.version
+      plugin: 'browser-wakatime/' + config.version,
     });
   }
 
-
   /**
    * Returns a promise with logging type variable.
    *
@@ -219,9 +220,11 @@ class WakaTimeCore {
   _getLoggingType() {
     var deferredObject = $.Deferred();
 
-        browser.storage.sync.get({
+    browser.storage.sync
-            loggingType: config.loggingType
+      .get({
-        }).then(function (items) {
+        loggingType: config.loggingType,
+      })
+      .then(function (items) {
         deferredObject.resolve(items.loggingType);
       });
 
@@ -238,7 +241,7 @@ class WakaTimeCore {
   sendHeartbeat(heartbeat, debug) {
     var payload = null;
 
-        this._getLoggingType().done((loggingType) => {
+    this._getLoggingType().done(loggingType => {
       // Get only the domain from the entity.
       // And send that in heartbeat
       if (loggingType == 'domain') {
@@ -264,7 +267,6 @@ class WakaTimeCore {
    * @returns {*}
    */
   sendAjaxRequestToApi(payload, method = 'POST') {
-
     var deferredObject = $.Deferred();
 
     $.ajax({
@@ -279,21 +281,20 @@ class WakaTimeCore {
         },
         201: function () {
           // nothing to do here
-                }
         },
-            success: (response) => {
+      },
+      success: response => {
         deferredObject.resolve(this);
       },
       error: (xhr, status, err) => {
         console.error(config.heartbeatApiUrl, status, err.toString());
 
         deferredObject.resolve(this);
-            }
+      },
     });
 
     return deferredObject.promise();
   }
-
 }
 
 export default WakaTimeCore;