feat: work on version backend system

__test__/manifest.spec.mjs

@@ -52,4 +52,38 @@ test("numerous small file", async (t) => {
   }
 
   fs.rmSync(dirName, { recursive: true });
-});
+});
+
+test.skip("performance test", async (t) => {
+  t.timeout(5 * 60 * 1000);
+  const dirName = "./.test/pt";
+  if (fs.existsSync(dirName)) fs.rmSync(dirName, { recursive: true });
+  fs.mkdirSync(dirName, { recursive: true });
+
+  const fileSize = 1 * 1000 * 1000 * 1000; // 1GB
+
+  const randomStream = fs.createReadStream("/dev/random", {
+    start: 0,
+    end: fileSize,
+  });
+  const outputStream = fs.createWriteStream(path.join(dirName, "file.bin"));
+  await new Promise((r) => {
+    randomStream.pipe(outputStream);
+    randomStream.on("end", r);
+  });
+
+  const start = Date.now();
+  await new Promise((r, e) =>
+    generateManifest(
+      dirName,
+      (_, __) => {},
+      (_, __) => {},
+      (err, manifest) => (err ? e(err) : r(manifest))
+    )
+  );
+  const end = Date.now();
+
+  t.pass(`Took ${end - start}ms to process ${fileSize / (1000 * 1000)}MB`);
+
+  fs.rmSync(dirName, { recursive: true });
+});