Consistently able to stream and detect

src/common.ts

@@ -21,5 +21,13 @@ export function saveFile(fileName: string, buf: Buffer) {
     fs.mkdirSync(baseDir);
   }
 
-  fs.writeFileSync(path.resolve(baseDir, fileName), buf);
+  fs.writeFileSync(path.resolve(baseDir, fileName), buf, "base64");
 }
+
+export const delay = (ms: number): Promise<void> => {
+  return new Promise((resolve) => {
+    setTimeout(() => {
+      resolve();
+    }, ms);
+  });
+};