fix: resolve 4 bugs in RankerHub

api/devcard/[username].ts

@@ -42,7 +42,7 @@ export default async function handler(req) {
   try {
     const url = new URL(req.url);
     const parts = url.pathname.split("/");
-    const usernameParam = parts[parts.length - 1];
+    const usernameParam = parts.at(-1);
     const username = decodeURIComponent(usernameParam).replace(/\.svg$/, "");
     const themeName = url.searchParams.get("theme") || "dark";
 

src/components/dashboard/RankingBreakdown.jsx

@@ -136,7 +136,7 @@ export const RankingBreakdown = ({ userData }) => {
         .slice(1)
         .map((p) => `L ${p.x} ${p.y}`)
         .join(" ");
-    const area = `${path} L ${points[points.length - 1].x} ${chartHeight - paddingY} L ${points[0].x} ${chartHeight - paddingY} Z`;
+    const area = `${path} L ${points.at(-1).x} ${chartHeight - paddingY} L ${points[0].x} ${chartHeight - paddingY} Z`;
 
     return {
       points,

src/services/rankHistoryService.js

@@ -26,7 +26,7 @@ export const saveRankSnapshot = async (uid, rank, totalPoints, timezone) => {
   // Extract number from "#42" or similar
   const numericRank =
     typeof rank === "string" ? parseInt(rank.replace(/[^0-9]/g, ""), 10) : rank;
-  if (isNaN(numericRank)) return;
+  if (Number.isNaN(numericRank)) return;
 
   const timeZone = resolveTimezone(timezone);
   const todayStr = toLocalDateString(new Date(), timeZone);

src/utils/githubRateLimit.js

@@ -5,7 +5,7 @@
  * and returns structured rate limit info.
  */
 export const parseRateLimitHeaders = (headers) => {
-  const remaining = parseInt(headers?.["x-ratelimit-remaining"] ?? -1);
+  const remaining = parseInt(headers?.["x-ratelimit-remaining"] ?? -1, 10);
   const limit = parseInt(headers?.["x-ratelimit-limit"] ?? -1);
   const resetTimestamp = parseInt(headers?.["x-ratelimit-reset"] ?? 0);