Add CI workflow for automated testing and validation

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  ci:
+    name: CI
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: pnpm/action-setup@v6
+        with:
+          run_install: false
+
+      - uses: actions/setup-node@v6
+        with:
+          node-version: 22
+          cache: pnpm
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Typecheck
+        run: pnpm typecheck
+
+      - name: Format
+        run: pnpm format:check
+
+      - name: Test
+        run: pnpm test
+
+      - name: Build
+        run: pnpm build

package.json

@@ -1,5 +1,6 @@
 {
   "name": "base-ui-css-intellisense",
+  "packageManager": "pnpm@10.33.0",
   "displayName": "Base UI CSS IntelliSense",
   "description": "Autocomplete and hover docs for Base UI data attributes and CSS variables in CSS, SCSS, and Less files.",
   "version": "0.1.0",
@@ -114,5 +115,12 @@
   },
   "dependencies": {
     "@babel/parser": "^7.29.2"
+  },
+  "pnpm": {
+    "onlyBuiltDependencies": [
+      "@vscode/vsce-sign",
+      "esbuild",
+      "keytar"
+    ]
   }
 }