From f3d5f35d9aa456806a785a6b388c61f0339cc4d1 Mon Sep 17 00:00:00 2001
From: Jan Keith Darunday <jkcdarunday@gmail.com>
Date: Wed, 18 Mar 2026 02:14:05 +0800
Subject: [PATCH 1/2] Add test case for write after close corruption

---
 test.js | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/test.js b/test.js
index 97fd7dc6..b362d80a 100644
--- a/test.js
+++ b/test.js
@@ -1845,6 +1845,57 @@ test('dedup mode', async (t) => {
   t.is(drive.blobs.core.length, len + 1)
 })
 
+test('write after close should not corrupt drive', async (t) => {
+  const platformCorestore = new Corestore(await t.tmp() , {
+    manifestVersion: 1,
+    compat: false,
+    wait: true
+  })
+  await platformCorestore.ready()
+
+  {
+    const corestore = platformCorestore.session({ writable: true })
+    await corestore.ready()
+    t.teardown(() => corestore.close())
+
+    const drive = new Hyperdrive(corestore)
+    await drive.ready()
+    t.teardown(() => drive.close())
+
+    await drive.db.put('manifest', 'hello world')
+
+    const batch = drive.batch()
+    try {
+      for (let i = 0; i < 14; i++) {
+        const stream = batch.createWriteStream('/file' + i + '.txt')
+        const close = new Promise(resolve => stream.on('close', resolve))
+        stream.end('hello world' + i)
+        await close
+
+        if (i === 2) await drive.close()
+      }
+      await batch.flush()
+      t.fail('batch should have errored when drive is closed')
+    } catch (err) {
+      t.pass('batch should error when drive is closed')
+    }
+    await corestore.close()
+  }
+
+  {
+    const corestore = platformCorestore.session({ writable: false })
+    await corestore.ready()
+    t.teardown(() => corestore.close())
+
+    const drive = new Hyperdrive(corestore)
+    await drive.ready()
+    t.teardown(() => drive.close())
+
+    const manifest = await drive.db.get('manifest')
+    t.is(manifest.value, 'hello world', 'should correctly read manifest')
+  }
+})
+
 async function testenv(t) {
   const { teardown } = t
 

From c25f3095d62ea69fb291b7fc71aeb0665fda8580 Mon Sep 17 00:00:00 2001
From: Jan Keith Darunday <jkcdarunday@gmail.com>
Date: Wed, 18 Mar 2026 02:20:00 +0800
Subject: [PATCH 2/2] Apply npm run format

---
 test.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/test.js b/test.js
index b362d80a..0b3bc1d2 100644
--- a/test.js
+++ b/test.js
@@ -1846,7 +1846,7 @@ test('dedup mode', async (t) => {
 })
 
 test('write after close should not corrupt drive', async (t) => {
-  const platformCorestore = new Corestore(await t.tmp() , {
+  const platformCorestore = new Corestore(await t.tmp(), {
     manifestVersion: 1,
     compat: false,
     wait: true
@@ -1868,7 +1868,7 @@ test('write after close should not corrupt drive', async (t) => {
     try {
       for (let i = 0; i < 14; i++) {
         const stream = batch.createWriteStream('/file' + i + '.txt')
-        const close = new Promise(resolve => stream.on('close', resolve))
+        const close = new Promise((resolve) => stream.on('close', resolve))
         stream.end('hello world' + i)
         await close