diff --git a/docs/typescript-checking.md b/docs/typescript-checking.md
index fa8871ad..51d1a0c6 100644
--- a/docs/typescript-checking.md
+++ b/docs/typescript-checking.md
@@ -6,15 +6,19 @@ This document describes the TypeScript checking convention established for the W
 
 Each TypeScript-enabled package in the monorepo now has a consistent `type-check` script that performs type checking without emitting files.
 
+**Progress: 4 out of 5 packages now passing! 🎉**
+
 ### Package Status
 
 #### ✅ Passing Packages
+
 - **webamp**: Clean TypeScript compilation
 - **ani-cursor**: Clean TypeScript compilation
-- **webamp-docs**: Clean TypeScript compilation (after adding webamp workspace dependency)
+- **skin-database**: Clean TypeScript compilation (fixed JSZip types, Jest types, and Buffer compatibility issues)
+- **webamp-docs**: Clean TypeScript compilation
 
 #### ❌ Failing Packages (Need fixes)
-- **skin-database**: 172 TypeScript errors (missing types, test setup issues)
+
 - **webamp-modern**: 390+ TypeScript errors (conflicting type definitions, target issues)
 
 ## Convention
@@ -40,7 +44,7 @@ The root package.json contains a centralized script that runs type checking for
 ```json
 {
   "scripts": {
-    "type-check": "pnpm --filter webamp type-check && pnpm --filter ani-cursor type-check && pnpm --filter webamp-docs type-check"
+    "type-check": "pnpm --filter webamp type-check && pnpm --filter ani-cursor type-check && pnpm --filter skin-database type-check && pnpm --filter webamp-docs type-check"
   }
 }
 ```
@@ -69,19 +73,28 @@ When adding a new TypeScript package to the type-check convention:
 
 ### Common Issues
 
-1. **Missing Jest types** (`skin-database`):
+1. **Missing Jest types** (Fixed in `skin-database`):
+
    - Install `@types/jest` and configure proper Jest setup
    - Ensure test files are properly configured
 
-2. **Conflicting type definitions** (`webamp-modern`):
+2. **Missing package types** (Fixed in `skin-database`):
+
+   - Install missing dependencies like `jszip`, `react-redux`, `express`
+   - Install corresponding `@types/` packages where needed
+   - Note: Some packages like JSZip provide their own types
+
+3. **Buffer compatibility issues** (Fixed in `skin-database`):
+
+   - Newer TypeScript versions require explicit casting for `fs.writeFileSync`
+   - Use `new Uint8Array(buffer)` instead of raw `Buffer` objects
+
+4. **Conflicting type definitions** (`webamp-modern`):
+
    - Multiple versions of `@types/node` causing conflicts
    - Target configuration issues (ES5 vs ES2015+)
    - Dependency type mismatches
 
-3. **Missing dependencies**:
-   - Missing type definitions for imported modules
-   - Incorrect dependency references
-
 ### Recommended Fix Strategy
 
 1. Start with packages that have fewer errors
diff --git a/package.json b/package.json
index f55be73b..99e6e7f5 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
   "scripts": {
     "test": "jest",
     "lint": "eslint . --ext ts,tsx,js,jsx --rulesdir=packages/webamp-modern/tools/eslint-rules",
-    "type-check": "pnpm --filter webamp type-check && pnpm --filter ani-cursor type-check && pnpm --filter webamp-docs type-check",
+    "type-check": "pnpm --filter webamp type-check && pnpm --filter ani-cursor type-check && pnpm --filter skin-database type-check && pnpm --filter webamp-docs type-check",
     "deploy": "sh deploy.sh",
     "format": "prettier --write '**/*.{js,ts,tsx}'"
   },
diff --git a/packages/skin-database/addSkin.ts b/packages/skin-database/addSkin.ts
index a6f07def..1d879d44 100644
--- a/packages/skin-database/addSkin.ts
+++ b/packages/skin-database/addSkin.ts
@@ -59,7 +59,7 @@ async function addModernSkinFromBuffer(
 ): Promise<Result> {
   console.log("Write temporarty file.");
   const tempFile = temp.path({ suffix: ".wal" });
-  fs.writeFileSync(tempFile, buffer);
+  fs.writeFileSync(tempFile, new Uint8Array(buffer));
   console.log("Put skin to S3.");
   await S3.putSkin(md5, buffer, "wal");
 
@@ -83,7 +83,7 @@ async function addClassicSkinFromBuffer(
   uploader: string
 ): Promise<Result> {
   const tempFile = temp.path({ suffix: ".wsz" });
-  fs.writeFileSync(tempFile, buffer);
+  fs.writeFileSync(tempFile, new Uint8Array(buffer));
   const tempScreenshotPath = temp.path({ suffix: ".png" });
 
   const logLines: string[] = [];
diff --git a/packages/skin-database/package.json b/packages/skin-database/package.json
index c4aa99d4..cff2e23c 100644
--- a/packages/skin-database/package.json
+++ b/packages/skin-database/package.json
@@ -21,6 +21,7 @@
     "graphql-yoga": "^5.10.10",
     "imagemin": "^7.0.0",
     "imagemin-optipng": "^7.0.0",
+    "jszip": "^3.10.1",
     "knex": "^0.21.1",
     "lru-cache": "^6.0.0",
     "mastodon-api": "^1.3.0",
@@ -33,6 +34,7 @@
     "react": "^19.1.0",
     "react-dom": "^19.1.0",
     "react-dropzone": "^11.1.0",
+    "react-redux": "^8.0.5",
     "react-window": "^1.8.1",
     "redux-observable": "^1.0.0",
     "rxjs": "^6.3.3",
@@ -64,6 +66,8 @@
   "prettier": {},
   "devDependencies": {
     "@types/cookie-session": "^2.0.48",
+    "@types/express": "^5.0.3",
+    "@types/jest": "^30.0.0",
     "@types/lru-cache": "^5.1.0",
     "@types/node-fetch": "^2.5.7",
     "@typescript-eslint/eslint-plugin": "^7.1.0",
diff --git a/packages/skin-database/tasks/screenshotSkin.ts b/packages/skin-database/tasks/screenshotSkin.ts
index acac0177..46c2902d 100644
--- a/packages/skin-database/tasks/screenshotSkin.ts
+++ b/packages/skin-database/tasks/screenshotSkin.ts
@@ -28,7 +28,7 @@ export async function screenshot(skin: SkinModel, shooter: typeof Shooter) {
   const tempFile = temp.path({ suffix: ".wsz" });
   const tempScreenshotPath = temp.path({ suffix: ".png" });
 
-  fs.writeFileSync(tempFile, buffer);
+  fs.writeFileSync(tempFile, new Uint8Array(buffer));
 
   const success = await shooter.takeScreenshot(tempFile, tempScreenshotPath, {
     minify: true,
diff --git a/packages/skin-database/tasks/syncToArchive.ts b/packages/skin-database/tasks/syncToArchive.ts
index b6c6e926..0498e73d 100644
--- a/packages/skin-database/tasks/syncToArchive.ts
+++ b/packages/skin-database/tasks/syncToArchive.ts
@@ -138,7 +138,7 @@ async function downloadToTemp(url: string, filename: string): Promise<string> {
   const result = await response.buffer();
   const tempDir = temp.mkdirSync();
   const tempFile = path.join(tempDir, filename);
-  fs.writeFileSync(tempFile, result);
+  fs.writeFileSync(tempFile, new Uint8Array(result));
   return tempFile;
 }
 
diff --git a/packages/skin-database/tasks/tweet.ts b/packages/skin-database/tasks/tweet.ts
index 2c4e155d..8a436829 100644
--- a/packages/skin-database/tasks/tweet.ts
+++ b/packages/skin-database/tasks/tweet.ts
@@ -109,7 +109,7 @@ async function sendTweet(skin: SkinModel): Promise<string> {
   const screenshotBuffer = await getResizedScreenshot(skin.getMd5());
   const filename = await skin.getFileName();
   const tempFile = temp.path({ suffix: ".png" });
-  fs.writeFileSync(tempFile, screenshotBuffer);
+  fs.writeFileSync(tempFile, new Uint8Array(screenshotBuffer));
   const t = getTwitterClient();
 
   const promise: Promise<{ media_id_string: string }> = new Promise(
diff --git a/packages/skin-database/utils.ts b/packages/skin-database/utils.ts
index 118c3f19..2bcf783a 100644
--- a/packages/skin-database/utils.ts
+++ b/packages/skin-database/utils.ts
@@ -73,7 +73,7 @@ export async function withBufferAsTempFile<T>(
 ): Promise<T> {
   const tempDir = temp.mkdirSync();
   const tempFile = path.join(tempDir, filename);
-  fs.writeFileSync(tempFile, buffer);
+  fs.writeFileSync(tempFile, new Uint8Array(buffer));
   const r = await cb(tempFile);
   fs.unlinkSync(tempFile);
   fs.rmdirSync(tempDir);
diff --git a/packages/webamp-docs/package.json b/packages/webamp-docs/package.json
index a2df40db..51876c50 100644
--- a/packages/webamp-docs/package.json
+++ b/packages/webamp-docs/package.json
@@ -22,8 +22,7 @@
     "clsx": "^2.0.0",
     "prism-react-renderer": "^2.3.0",
     "react": "^19.0.0",
-    "react-dom": "^19.0.0",
-    "webamp": "workspace:*"
+    "react-dom": "^19.0.0"
   },
   "devDependencies": {
     "@docusaurus/module-type-aliases": "3.8.1",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 75e8e6f4..0e700377 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -98,7 +98,7 @@ importers:
     dependencies:
       '@next/third-parties':
         specifier: ^15.3.3
-        version: 15.3.3(next@15.3.3(@babel/core@7.27.4)(babel-plugin-macros@3.1.0)(react-dom@19.1.0(react@19.1.0))(react@19.1.0))(react@19.1.0)
+        version: 15.3.3(next@15.3.3(react-dom@19.1.0(react@19.1.0))(react@19.1.0))(react@19.1.0)
       '@sentry/node':
         specifier: ^5.27.3
         version: 5.30.0
@@ -147,6 +147,9 @@ importers:
       imagemin-optipng:
         specifier: ^7.0.0
         version: 7.1.0
+      jszip:
+        specifier: ^3.10.1
+        version: 3.10.1
       knex:
         specifier: ^0.21.1
         version: 0.21.21(sqlite3@5.1.7)
@@ -161,7 +164,7 @@ importers:
         version: 2.3.0
       next:
         specifier: ^15.3.3
-        version: 15.3.3(@babel/core@7.27.4)(babel-plugin-macros@3.1.0)(react-dom@19.1.0(react@19.1.0))(react@19.1.0)
+        version: 15.3.3(react-dom@19.1.0(react@19.1.0))(react@19.1.0)
       node-fetch:
         specifier: ^2.6.7
         version: 2.7.0(encoding@0.1.13)
@@ -183,6 +186,9 @@ importers:
       react-dropzone:
         specifier: ^11.1.0
         version: 11.7.1(react@19.1.0)
+      react-redux:
+        specifier: ^8.0.5
+        version: 8.1.3(@types/react-dom@18.2.24)(@types/react@18.2.74)(react-dom@19.1.0(react@19.1.0))(react@19.1.0)(redux@5.0.1)
       react-window:
         specifier: ^1.8.1
         version: 1.8.11(react-dom@19.1.0(react@19.1.0))(react@19.1.0)
@@ -220,6 +226,12 @@ importers:
       '@types/cookie-session':
         specifier: ^2.0.48
         version: 2.0.48
+      '@types/express':
+        specifier: ^5.0.3
+        version: 5.0.3
+      '@types/jest':
+        specifier: ^30.0.0
+        version: 30.0.0
       '@types/lru-cache':
         specifier: ^5.1.0
         version: 5.1.1
@@ -504,9 +516,6 @@ importers:
       react-dom:
         specifier: ^19.0.0
         version: 19.1.0(react@19.1.0)
-      webamp:
-        specifier: workspace:*
-        version: link:../webamp
     devDependencies:
       '@docusaurus/module-type-aliases':
         specifier: 3.8.1
@@ -4131,9 +4140,15 @@ packages:
   '@types/express-serve-static-core@4.17.43':
     resolution: {integrity: sha512-oaYtiBirUOPQGSWNGPWnzyAFJ0BP3cwvN4oWZQY+zUBwpVIGsKUkpBpSztp74drYcjavs7SKFZ4DX1V2QeN8rg==}
 
+  '@types/express-serve-static-core@5.0.6':
+    resolution: {integrity: sha512-3xhRnjJPkULekpSzgtoNYYcTWgEZkp4myc+Saevii5JPnHNvHMRlBSHDbs7Bh1iPPoVTERHEZXyhyLbMEsExsA==}
+
   '@types/express@4.17.21':
     resolution: {integrity: sha512-ejlPM315qwLpaQlQDTjPdsUFSc6ZsP4AN6AlWnogPjQ7CVi7PYF3YVz+CY3jE2pwYf7E/7HlDAN0rV2GxTG0HQ==}
 
+  '@types/express@5.0.3':
+    resolution: {integrity: sha512-wGA0NX93b19/dZC1J18tKWVIYWyyF2ZjT9vin/NRu0qzzvfVzWjs04iq2rQ3H65vCTQYlRqs3YHfY7zjdV+9Kw==}
+
   '@types/fscreen@1.0.4':
     resolution: {integrity: sha512-TsjxyAUvlvuQyao9vNk0yES4nY07K9xoAbkhgXU948JG39EqlLxniWuW9OiZde9Q8ACSpu3fmbXXRAfb/l/HqQ==}
 
@@ -16927,7 +16942,7 @@ snapshots:
   '@jest/console@28.1.3':
     dependencies:
       '@jest/types': 28.1.3
-      '@types/node': 20.12.4
+      '@types/node': 24.0.10
       chalk: 4.1.2
       jest-message-util: 28.1.3
       jest-util: 28.1.3
@@ -17108,7 +17123,7 @@ snapshots:
       '@jest/transform': 28.1.3
       '@jest/types': 28.1.3
       '@jridgewell/trace-mapping': 0.3.25
-      '@types/node': 20.12.4
+      '@types/node': 24.0.10
       chalk: 4.1.2
       collect-v8-coverage: 1.0.2
       exit: 0.1.2
@@ -17497,9 +17512,9 @@ snapshots:
   '@next/swc-win32-x64-msvc@15.3.3':
     optional: true
 
-  '@next/third-parties@15.3.3(next@15.3.3(@babel/core@7.27.4)(babel-plugin-macros@3.1.0)(react-dom@19.1.0(react@19.1.0))(react@19.1.0))(react@19.1.0)':
+  '@next/third-parties@15.3.3(next@15.3.3(react-dom@19.1.0(react@19.1.0))(react@19.1.0))(react@19.1.0)':
     dependencies:
-      next: 15.3.3(@babel/core@7.27.4)(babel-plugin-macros@3.1.0)(react-dom@19.1.0(react@19.1.0))(react@19.1.0)
+      next: 15.3.3(react-dom@19.1.0(react@19.1.0))(react@19.1.0)
       react: 19.1.0
       third-party-capital: 1.0.20
 
@@ -17638,13 +17653,15 @@ snapshots:
     transitivePeerDependencies:
       - '@parcel/core'
 
-  '@parcel/cache@2.12.0(@parcel/core@2.12.0(@swc/helpers@0.5.15))':
+  '@parcel/cache@2.12.0(@parcel/core@2.12.0(@swc/helpers@0.5.15))(@swc/helpers@0.5.15)':
     dependencies:
       '@parcel/core': 2.12.0(@swc/helpers@0.5.15)
       '@parcel/fs': 2.12.0(@parcel/core@2.12.0(@swc/helpers@0.5.15))(@swc/helpers@0.5.15)
       '@parcel/logger': 2.12.0
       '@parcel/utils': 2.12.0
       lmdb: 2.8.5
+    transitivePeerDependencies:
+      - '@swc/helpers'
 
   '@parcel/cache@2.7.0(@parcel/core@2.12.0(@swc/helpers@0.5.15))':
     dependencies:
@@ -17716,7 +17733,7 @@ snapshots:
   '@parcel/core@2.12.0(@swc/helpers@0.5.15)':
     dependencies:
       '@mischnic/json-sourcemap': 0.1.1
-      '@parcel/cache': 2.12.0(@parcel/core@2.12.0(@swc/helpers@0.5.15))
+      '@parcel/cache': 2.12.0(@parcel/core@2.12.0(@swc/helpers@0.5.15))(@swc/helpers@0.5.15)
       '@parcel/diagnostic': 2.12.0
       '@parcel/events': 2.12.0
       '@parcel/fs': 2.12.0(@parcel/core@2.12.0(@swc/helpers@0.5.15))(@swc/helpers@0.5.15)
@@ -18205,7 +18222,7 @@ snapshots:
 
   '@parcel/types@2.12.0(@parcel/core@2.12.0(@swc/helpers@0.5.15))(@swc/helpers@0.5.15)':
     dependencies:
-      '@parcel/cache': 2.12.0(@parcel/core@2.12.0(@swc/helpers@0.5.15))
+      '@parcel/cache': 2.12.0(@parcel/core@2.12.0(@swc/helpers@0.5.15))(@swc/helpers@0.5.15)
       '@parcel/diagnostic': 2.12.0
       '@parcel/fs': 2.12.0(@parcel/core@2.12.0(@swc/helpers@0.5.15))(@swc/helpers@0.5.15)
       '@parcel/package-manager': 2.12.0(@parcel/core@2.12.0(@swc/helpers@0.5.15))(@swc/helpers@0.5.15)
@@ -18933,11 +18950,11 @@ snapshots:
   '@types/body-parser@1.19.5':
     dependencies:
       '@types/connect': 3.4.38
-      '@types/node': 20.12.4
+      '@types/node': 24.0.10
 
   '@types/bonjour@3.5.13':
     dependencies:
-      '@types/node': 20.12.4
+      '@types/node': 24.0.10
 
   '@types/cacheable-request@6.0.3':
     dependencies:
@@ -18953,15 +18970,15 @@ snapshots:
   '@types/connect-history-api-fallback@1.5.4':
     dependencies:
       '@types/express-serve-static-core': 4.17.43
-      '@types/node': 20.12.4
+      '@types/node': 24.0.10
 
   '@types/connect@3.4.38':
     dependencies:
-      '@types/node': 20.12.4
+      '@types/node': 24.0.10
 
   '@types/cookie-session@2.0.48':
     dependencies:
-      '@types/express': 4.17.21
+      '@types/express': 5.0.3
       '@types/keygrip': 1.0.6
 
   '@types/cookie@0.4.1': {}
@@ -19003,7 +19020,14 @@ snapshots:
 
   '@types/express-serve-static-core@4.17.43':
     dependencies:
-      '@types/node': 20.12.4
+      '@types/node': 24.0.10
+      '@types/qs': 6.9.14
+      '@types/range-parser': 1.2.7
+      '@types/send': 0.17.4
+
+  '@types/express-serve-static-core@5.0.6':
+    dependencies:
+      '@types/node': 24.0.10
       '@types/qs': 6.9.14
       '@types/range-parser': 1.2.7
       '@types/send': 0.17.4
@@ -19015,6 +19039,12 @@ snapshots:
       '@types/qs': 6.9.14
       '@types/serve-static': 1.15.7
 
+  '@types/express@5.0.3':
+    dependencies:
+      '@types/body-parser': 1.19.5
+      '@types/express-serve-static-core': 5.0.6
+      '@types/serve-static': 1.15.7
+
   '@types/fscreen@1.0.4': {}
 
   '@types/glob@7.2.0':
@@ -19212,7 +19242,7 @@ snapshots:
   '@types/send@0.17.4':
     dependencies:
       '@types/mime': 1.3.5
-      '@types/node': 20.12.4
+      '@types/node': 24.0.10
 
   '@types/serve-index@1.9.4':
     dependencies:
@@ -19221,12 +19251,12 @@ snapshots:
   '@types/serve-static@1.15.7':
     dependencies:
       '@types/http-errors': 2.0.4
-      '@types/node': 20.12.4
+      '@types/node': 24.0.10
       '@types/send': 0.17.4
 
   '@types/sockjs@0.3.36':
     dependencies:
-      '@types/node': 20.12.4
+      '@types/node': 24.0.10
 
   '@types/stack-utils@2.0.3': {}
 
@@ -19244,7 +19274,7 @@ snapshots:
 
   '@types/ws@8.5.10':
     dependencies:
-      '@types/node': 20.12.4
+      '@types/node': 24.0.10
 
   '@types/yargs-parser@21.0.3': {}
 
@@ -25162,7 +25192,7 @@ snapshots:
       '@jest/environment': 29.7.0
       '@jest/fake-timers': 29.7.0
       '@jest/types': 29.6.3
-      '@types/node': 20.12.4
+      '@types/node': 24.0.10
       jest-mock: 29.7.0
       jest-util: 29.7.0
 
@@ -25188,7 +25218,7 @@ snapshots:
     dependencies:
       '@jest/types': 28.1.3
       '@types/graceful-fs': 4.1.9
-      '@types/node': 20.12.4
+      '@types/node': 24.0.10
       anymatch: 3.1.3
       fb-watchman: 2.0.2
       graceful-fs: 4.2.11
@@ -25388,7 +25418,7 @@ snapshots:
       '@jest/test-result': 28.1.3
       '@jest/transform': 28.1.3
       '@jest/types': 28.1.3
-      '@types/node': 20.12.4
+      '@types/node': 24.0.10
       chalk: 4.1.2
       emittery: 0.10.2
       graceful-fs: 4.2.11
@@ -25589,7 +25619,7 @@ snapshots:
     dependencies:
       '@jest/test-result': 28.1.3
       '@jest/types': 28.1.3
-      '@types/node': 20.12.4
+      '@types/node': 24.0.10
       ansi-escapes: 4.3.2
       chalk: 4.1.2
       emittery: 0.10.2
@@ -27363,7 +27393,7 @@ snapshots:
       - '@babel/core'
       - babel-plugin-macros
 
-  next@15.3.3(@babel/core@7.27.4)(babel-plugin-macros@3.1.0)(react-dom@19.1.0(react@19.1.0))(react@19.1.0):
+  next@15.3.3(react-dom@19.1.0(react@19.1.0))(react@19.1.0):
     dependencies:
       '@next/env': 15.3.3
       '@swc/counter': 0.1.3
@@ -27373,7 +27403,7 @@ snapshots:
       postcss: 8.4.31
       react: 19.1.0
       react-dom: 19.1.0(react@19.1.0)
-      styled-jsx: 5.1.6(@babel/core@7.27.4)(babel-plugin-macros@3.1.0)(react@19.1.0)
+      styled-jsx: 5.1.6(react@19.1.0)
     optionalDependencies:
       '@next/swc-darwin-arm64': 15.3.3
       '@next/swc-darwin-x64': 15.3.3
@@ -30665,13 +30695,10 @@ snapshots:
       '@babel/core': 7.27.4
       babel-plugin-macros: 3.1.0
 
-  styled-jsx@5.1.6(@babel/core@7.27.4)(babel-plugin-macros@3.1.0)(react@19.1.0):
+  styled-jsx@5.1.6(react@19.1.0):
     dependencies:
       client-only: 0.0.1
       react: 19.1.0
-    optionalDependencies:
-      '@babel/core': 7.27.4
-      babel-plugin-macros: 3.1.0
 
   stylehacks@5.1.1(postcss@8.5.6):
     dependencies: