add typescript to backend

backend/src/utils/logger.ts

@@ -0,0 +1,35 @@
+import fs from "fs";
+
+class Logger {
+  private filePath: string;
+
+  constructor(filePath: string = "/logs/app.log") {
+    this.filePath = filePath;
+  }
+
+  private log(level: string, message: string, params?: object) {
+    const logEntry = {
+      timestamp: new Date().toISOString(),
+      level: level,
+      message: message,
+      params: params,
+    };
+    fs.appendFile(this.filePath, JSON.stringify(logEntry) + "\n", (err) => {
+      if (err) throw err;
+    });
+  }
+
+  info(message: string, params: object = {}) {
+    this.log("info", message, params);
+  }
+
+  warn(message: string, params: object = {}) {
+    this.log("warn", message, params);
+  }
+
+  error(message: string, params: object = {}) {
+    this.log("error", message, params);
+  }
+}
+
+export default Logger;