ci: add package duplication checking

Author: azat-io

.github/workflows/test.yml

@@ -58,6 +58,23 @@ jobs:
       - name: Test
         run: pnpm test:js
 
+  packages:
+    name: Packages
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Tools
+        uses: ./.github/actions/install-tools
+
+      - name: Install Dependencies
+        uses: ./.github/actions/install-dependencies
+
+      - name: Test
+        run: pnpm test:packages
+
   spelling:
     name: Spelling
     runs-on: ubuntu-latest

package.json

@@ -47,6 +47,7 @@
     "test:format:js": "prettier --check \"**/*.{svelte,js,ts,css,json,md,yml}\"",
     "test:format:rust": "cargo fmt -- --check",
     "test:js": "eslint .",
+    "test:packages": "pnpm dedupe --check",
     "test:spelling": "cspell \"**/*\"",
     "test:svelte": "svelte-check",
     "test:types": "tsc --noEmit --pretty",