diff --git a/.oxlintrc.json b/.oxlintrc.json
new file mode 100644
index 0000000..a2d4608
--- /dev/null
+++ b/.oxlintrc.json
@@ -0,0 +1,21 @@
+{
+  "env": {
+    "browser": true,
+    "node": true,
+    "es2021": true
+  },
+  "ignorePatterns": ["vendor", "dist", "node_modules"],
+  "rules": {
+    "no-cond-assign": "off",
+    "no-plusplus": "off",
+    "no-bitwise": "off"
+  },
+  "overrides": [
+    {
+      "files": ["test/test-types*.ts"],
+      "rules": {
+        "no-unused-vars": "off"
+      }
+    }
+  ]
+}
diff --git a/AGENTS.md b/AGENTS.md
index 7b4d967..74f6b46 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -16,7 +16,7 @@ tiny-oss is a tiny object storage SDK focused on uploading, with a functional AP
 
 ## Quick notes
 
-- Commands live in `package.json`; formatting/lint are handled by `.editorconfig` and `oxlint.json`.
+- Commands live in `package.json`; formatting/lint are handled by `.editorconfig` and `.oxlintrc.json`.
 - Integration specs (`test/*-integration.spec.ts`) need `npm run serve` first (Hono server on :8080, credentials from `.env`); signature/unit specs don't.
 - Input data is `Blob | ArrayBuffer | Uint8Array | string`; mini programs pass `ArrayBuffer`.
 
diff --git a/oxlint.json b/oxlint.json
deleted file mode 100644
index b288630..0000000
--- a/oxlint.json
+++ /dev/null
@@ -1,13 +0,0 @@
-{
-  "env": {
-    "browser": true,
-    "node": true,
-    "es2021": true
-  },
-  "ignore": ["vendor", "dist", "node_modules"],
-  "rules": {
-    "no-cond-assign": "off",
-    "no-plusplus": "off",
-    "no-bitwise": "off"
-  }
-}
diff --git a/src/cos/request.ts b/src/cos/request.ts
index b975c20..1a256ac 100644
--- a/src/cos/request.ts
+++ b/src/cos/request.ts
@@ -1,5 +1,4 @@
 import { getTransport } from '../transport'
-import { encodeUtf8 } from '../utils'
 import { normalizeOptions, resolveTimeout, dataSize } from '../ops/request'
 import { getCosAuth } from './signature'
 import { resolveCosHost } from './host'
diff --git a/src/ops/multipartUpload.ts b/src/ops/multipartUpload.ts
index 6cb3720..63be5b7 100644
--- a/src/ops/multipartUpload.ts
+++ b/src/ops/multipartUpload.ts
@@ -122,8 +122,6 @@ export function createMultipartUpload(protocol: Protocol, deps: MultipartUploadD
 
     // Calculate parts to upload
     for (let i = 1; i <= numParts; i++) {
-      const start = (i - 1) * actualPartSize
-      const end = Math.min(i * actualPartSize, fileSize)
       const isDone = doneParts.some((p) => p.number === i)
       if (!isDone) {
         currentCheckpoint.parts.push({ number: i, etag: '' })
@@ -160,7 +158,7 @@ export function createMultipartUpload(protocol: Protocol, deps: MultipartUploadD
       let result: UploadPartResult
       try {
         result = await uploadOnce()
-      } catch (err) {
+      } catch {
         // Retry once on error
         result = await uploadOnce()
       }
diff --git a/test/aws.spec.ts b/test/aws.spec.ts
index b7a4d55..39db0b6 100644
--- a/test/aws.spec.ts
+++ b/test/aws.spec.ts
@@ -185,7 +185,6 @@ describe('AWS entry point', () => {
   it('multipartUpload meta uses the x-amz-meta- prefix', async () => {
     const calls: any[] = []
     setTransport(async (url: string, opts: any) => {
-      const headers: Record<string, string> = {}
       if (url.indexOf('?uploads') > -1) {
         calls.push({ url, opts })
         return {
diff --git a/test/provider.spec.ts b/test/provider.spec.ts
index 23a334a..c7eb5c4 100644
--- a/test/provider.spec.ts
+++ b/test/provider.spec.ts
@@ -1,4 +1,4 @@
-import { describe, it, expect, vi, afterEach } from 'vitest'
+import { describe, it, expect, afterEach } from 'vitest'
 import {
   createPut,
   createInitMultipartUpload,