diff --git a/assets/modules/analytics.js b/assets/modules/analytics.js
index 0a4a2ec..f515047 100644
--- a/assets/modules/analytics.js
+++ b/assets/modules/analytics.js
@@ -20,7 +20,7 @@ async function encrypt(data) {
     const combined = new Uint8Array(12 + buf.length)
     combined.set(iv)
     combined.set(buf, 12)
-    return globalThis.btoa(String.fromCharCode(...combined))
+    return globalThis.btoa(String.fromCodePoint(...combined))
 }
 
 async function decrypt(b64) {
@@ -68,8 +68,8 @@ async function send(data, expectResponse = false) {
 }
 
 async function getOrCreateVisitor() {
-    let uid = sessionStorage.getItem(SK_UID)
-    let hash = sessionStorage.getItem(SK_HASH)
+    const uid = sessionStorage.getItem(SK_UID)
+    const hash = sessionStorage.getItem(SK_HASH)
     if (uid && hash) return { uid, hash }
 
     const resp = await send({
@@ -78,7 +78,7 @@ async function getOrCreateVisitor() {
         l: navigator.language || null,
     }, true)
 
-    if (!resp || !resp.uid || !resp.h) return null
+    if (!resp?.uid || !resp?.h) return null
 
     sessionStorage.setItem(SK_UID, resp.uid)
     sessionStorage.setItem(SK_HASH, resp.h)
@@ -121,7 +121,7 @@ export async function initAnalytics() {
 
     const authUserId = document.body.dataset.uid
     if (authUserId) {
-        await setAuth(parseInt(authUserId, 10))
+        await setAuth(Number.parseInt(authUserId, 10))
     }
 }