@@ -18,7 +18,13 @@ function getFilename(name: string): string {   return path.join(publicDir, `${name}`);
 }
 
-let files: Map<string, any> = new Map();
+type File = {
+  filename: string;
+  size: number;
+  mtime: string;
+};
+
+let files = new Map<string, File>();
 
 function registerFile(pathname: string, absPath: string, stat: Stats): void {
   pathname = "/" + (pathname === "." || pathname === "./" ? "" : pathname);