Fixed battery errors on firefox

frontend/src/components/OtherBlock.js

@@ -20,9 +20,13 @@ const OtherBlock = ({ workerData }) => {
       .catch(() => {
         setAdBlock(true);
       });
+    if ('getBattery' in navigator) {
       navigator.getBattery().then((res) => {
         setBattery(res);
       });
+    } else {
+      setBattery('N/A');
+    }
   }, []);
 
   return (

frontend/src/utils/navigator.js

@@ -157,11 +157,11 @@ const checkNavigatorProperties = (key) => {
 };
 
 const checkNavigatorValue = (key) => {
-  if (
+  try {
-    Object.getOwnPropertyDescriptor(Navigator.prototype, key).value !==
+    // eslint-disable-next-line no-unused-vars
-    undefined
+    const { value } = Object.getOwnPropertyDescriptor(Navigator.prototype, key);
-  ) {
+  } catch (err) {
-    return 'Failed descriptor.value undefined';
+    return 'Failed Navigator.prototype';
   }
   return null;
 };

frontend/src/utils/other.js

@@ -21,7 +21,17 @@ const checkDatePrototype = () => {
 };
 
 // Returns object with location data
-const getOther = (battery, adBlock, workerData) => [
+const getOther = (battery, adBlock, workerData) => {
+  console.log(battery);
+  let batteryLevel, batteryStatus;
+  if (battery === 'N/A') {
+    batteryLevel = 'N/A';
+    batteryStatus = 'N/A';
+  } else {
+    batteryLevel = `${Math.round(battery.level * 100)}%`;
+    batteryStatus = battery.charging ? 'Charging' : 'Not charging';
+  }
+  return [
     {
       key: 'Brave browser',
       value: navigator.brave ? 'True' : 'False',
@@ -47,19 +57,22 @@ const getOther = (battery, adBlock, workerData) => [
       value: new Date().getTimezoneOffset(),
       issues: [
         checkDatePrototype(),
-      checkWebWorker(new Date().getTimezoneOffset(), workerData.timezoneOffset),
+        checkWebWorker(
+          new Date().getTimezoneOffset(),
+          workerData.timezoneOffset
+        ),
       ],
     },
     {
       key: 'Battery level',
-    value: `${Math.round(battery.level * 100)}%`,
+      value: batteryLevel,
       issues: [],
     },
     {
       key: 'Battery status',
-    value: battery.charging ? 'Charging' : 'Not charging',
+      value: batteryStatus,
       issues: [],
     },
-];
+  ];
-
+};
 export default getOther;