[eslint] no-mixed-operators

.eslintrc.js

         'new-parens': 2,
         'no-array-constructor': 2,
         'no-inline-comments': 0,
+        'no-mixed-operators': 2,
         'no-mixed-spaces-and-tabs': 2,
         'no-multiple-empty-lines': 2,
         'no-negated-condition': 2,

modules/connectivity/ConnectionQuality.js

             const maxIncreasePerSecond = 2;
             const prevConnectionQuality = this._localStats.connectionQuality;
             const diffSeconds
-                = (window.performance.now()
-                    - this._lastConnectionQualityUpdate) / 1000;
-            quality = Math.min(
-                quality,
-                prevConnectionQuality + diffSeconds * maxIncreasePerSecond);
+                = (window.performance.now() - this._lastConnectionQualityUpdate)
+                    / 1000;
+            quality
+                = Math.min(
+                    quality,
+                    prevConnectionQuality
+                        + (diffSeconds * maxIncreasePerSecond));
         }
 
         return Math.min(100, quality);

modules/xmpp/SdpTransformUtil.js

      */
     findGroup(semantics, ssrcs) {
         return this.ssrcGroups.find(
-            group => group.semantics === semantics
-                && !ssrcs || ssrcs === group.ssrcs);
+            group =>
+                group.semantics === semantics
+                    && (!ssrcs || ssrcs === group.ssrcs));
     }
 
     /**

modules/xmpp/recording.js

 const JitsiRecorderErrors = require('../../JitsiRecorderErrors');
 const GlobalOnErrorHandler = require('../util/GlobalOnErrorHandler');
 
-
 function Recording(type, eventEmitter, connection, focusMucJid, jirecon,
     roomjid) {
     this.eventEmitter = eventEmitter;
     this.type = type;
     this._isSupported
         = !(
-            type === Recording.types.JIRECON
-                && !this.jirecon
+            (type === Recording.types.JIRECON && !this.jirecon)
                 || (type !== Recording.types.JIBRI
                     && type !== Recording.types.COLIBRI));