diff --git a/src/favicon.ts b/src/favicon.ts
index 5141bf1f37..a8391b1adc 100644
--- a/src/favicon.ts
+++ b/src/favicon.ts
@@ -101,7 +101,7 @@ export default class Favicon {
         h: number;
     } {
         const opt = {
-            n: typeof n === "number" ? Math.abs(n as number | 0) : n,
+            n: typeof n === "number" ? Math.abs(n | 0) : n,
             len: ("" + n).length,
             // badge positioning constants as percentages
             x: 0.4,
@@ -178,7 +178,7 @@ export default class Favicon {
         this.context.fillStyle = params.textColor;
 
         if (typeof opt.n === "number" && opt.n > 999) {
-            const count = (opt.n > 9999 ? 9 : Math.floor((opt.n as number) / 1000)) + "k+";
+            const count = (opt.n > 9999 ? 9 : Math.floor(opt.n / 1000)) + "k+";
             this.context.fillText(count, Math.floor(opt.x + opt.w / 2), Math.floor(opt.y + opt.h - opt.h * 0.2));
         } else {
             this.context.fillText("" + opt.n, Math.floor(opt.x + opt.w / 2), Math.floor(opt.y + opt.h - opt.h * 0.15));
diff --git a/src/vector/getconfig.ts b/src/vector/getconfig.ts
index 39a4ff6850..5078560b17 100644
--- a/src/vector/getconfig.ts
+++ b/src/vector/getconfig.ts
@@ -23,7 +23,7 @@ export async function getVectorConfig(relativeLocation = ""): Promise<IConfigOpt
 
     // Handle trailing dot FQDNs
     let domain = window.location.hostname.trimEnd();
-    if (domain[domain.length - 1] === ".") {
+    if (domain.endsWith(".")) {
         domain = domain.slice(0, -1);
     }
 
diff --git a/src/vector/localstorage-fix.ts b/src/vector/localstorage-fix.ts
index 3c3d46b8ac..204aa004f1 100644
--- a/src/vector/localstorage-fix.ts
+++ b/src/vector/localstorage-fix.ts
@@ -5,7 +5,7 @@
 
 if (window.localStorage) {
     Object.keys(window.localStorage).forEach((key) => {
-        if (key.indexOf("loglevel:") === 0) {
+        if (key.startsWith("loglevel:")) {
             window.localStorage.removeItem(key);
         }
     });
diff --git a/src/vector/mobile_guide/index.ts b/src/vector/mobile_guide/index.ts
index 91e10181f1..30bef430c8 100644
--- a/src/vector/mobile_guide/index.ts
+++ b/src/vector/mobile_guide/index.ts
@@ -70,7 +70,7 @@ async function initPage(): Promise<void> {
         try {
             const result = await fetch(`https://${serverName}/.well-known/matrix/client`);
             const wkConfig = await result.json();
-            if (wkConfig && wkConfig["m.homeserver"]) {
+            if (wkConfig?.["m.homeserver"]) {
                 hsUrl = wkConfig["m.homeserver"]["base_url"];
 
                 if (wkConfig["m.identity_server"]) {
@@ -78,7 +78,7 @@ async function initPage(): Promise<void> {
                 }
             }
         } catch (e) {
-            if (wkConfig && wkConfig["m.homeserver"]) {
+            if (wkConfig?.["m.homeserver"]) {
                 hsUrl = wkConfig["m.homeserver"]["base_url"] || undefined;
 
                 if (wkConfig["m.identity_server"]) {