Refactor song polling logic for adaptive delays and add tsconfig.json for TypeScript configuration

src/server.ts

@@ -1,4 +1,4 @@
-import { Elysia, t } from 'elysia';
+import { Elysia } from 'elysia';
 import { staticPlugin } from '@elysiajs/static';
 import path from 'path';
 
@@ -15,6 +15,7 @@ interface LastSong {
 // Current song state
 let currentSong: LastSong | null = null;
 let lastSongId: string | null = null;
+let pollTimer: ReturnType<typeof setTimeout> | null = null;
 
 // WebSocket connections
 const connections = new Set<any>();
@@ -54,18 +55,20 @@ async function fetchLastFmSong(): Promise<LastSong | null> {
 async function checkAndUpdateSong(): Promise<void> {
   const newSong = await fetchLastFmSong();
 
-  if (!newSong) return;
+  // Default to not currently playing if we couldn't fetch anything
+  let nowPlaying = false;
 
-  // Create a unique identifier for the song
+  if (newSong) {
+    // Create a unique identifier for the song (include nowPlaying state)
     const newSongId = `${newSong.artist}-${newSong.name}-${newSong.nowPlaying}`;
 
     // Check if song has changed
     if (newSongId !== lastSongId) {
       console.log('Song changed:', newSong.name, 'by', newSong.artist);
+      // Update state and notify clients
       currentSong = newSong;
       lastSongId = newSongId;
 
-    // Notify all connected WebSocket clients
       const message = JSON.stringify({
         type: 'song-update',
         data: newSong
@@ -79,13 +82,24 @@ async function checkAndUpdateSong(): Promise<void> {
           connections.delete(ws);
         }
       });
-  }
+    } else {
+      // Keep currentSong updated even if no change to ID (e.g., image/url may vary)
+      currentSong = newSong;
     }
 
-// Start polling Last.fm every second
-setInterval(checkAndUpdateSong, 1000);
+    nowPlaying = !!newSong.nowPlaying;
+  } else {
+    // If fetch failed, keep existing currentSong and fall back to slower polling
+    nowPlaying = currentSong?.nowPlaying ?? false;
+  }
 
-// Initial fetch
+  // Schedule next poll based on whether a track is currently playing
+  const delayMs = nowPlaying ? 5000 : 30000;
+  if (pollTimer) clearTimeout(pollTimer);
+  pollTimer = setTimeout(checkAndUpdateSong, delayMs);
+}
+
+// Kick off adaptive polling with an immediate check
 checkAndUpdateSong();
 
 // Determine static assets path - adjust for compiled executable

tsconfig.json

@@ -0,0 +1,21 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "strict": true,
+    "noEmit": true,
+    "skipLibCheck": true,
+    "types": [
+      "bun-types",
+      "vite/client"
+    ],
+    "jsx": "react-jsx",
+    "allowJs": true,
+    "resolveJsonModule": true
+  },
+  "include": [
+    "src",
+    "vite.config.*"
+  ]
+}