Fix sonarjs prefer-single-boolean-return

src/components/focusManager.js

@@ -56,15 +56,8 @@ import scrollManager from './scrollManager';
     }).join(',') + ',.focusable';
 
     function isFocusable(elem) {
-        if (focusableTagNames.indexOf(elem.tagName) !== -1) {
-            return true;
-        }
-
-        if (elem.classList && elem.classList.contains('focusable')) {
-            return true;
-        }
-
-        return false;
+        return focusableTagNames.indexOf(elem.tagName) !== -1
+            || (elem.classList?.contains('focusable'));
     }
 
     function normalizeFocusable(elem, originalElement) {
@@ -97,11 +90,7 @@ import scrollManager from './scrollManager';
     // Determines if a focusable element can be focused at a given point in time
     function isCurrentlyFocusableInternal(elem) {
         // http://stackoverflow.com/questions/19669786/check-if-element-is-visible-in-dom
-        if (elem.offsetParent === null) {
-            return false;
-        }
-
-        return true;
+        return elem.offsetParent !== null;
     }
 
     // Determines if a focusable element can be focused at a given point in time