diff --git a/.tangled/workflows/ci.yml b/.tangled/workflows/ci.yml
new file mode 100644
index 0000000..bd0a0cc
--- /dev/null
+++ b/.tangled/workflows/ci.yml
@@ -0,0 +1,26 @@
+when:
+  - event: ["push", "manual"]
+    branch: ["**"]
+  - event: ["pull_request"]
+    branch: ["**"]
+
+engine: "nixery"
+
+dependencies:
+  nixpkgs/nixpkgs-unstable:
+    - git
+    - nodejs
+    - pnpm
+
+steps:
+  - name: "Install dependencies"
+    command: "pnpm install --frozen-lockfile"
+
+  - name: "Check formatting"
+    command: "pnpm format:check"
+
+  - name: "Typecheck"
+    command: "pnpm typecheck"
+
+  - name: "Build"
+    command: "pnpm build"
diff --git a/package.json b/package.json
index 55016b7..d7fd799 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,8 @@
     "build": "vite build && node scripts/build-worker.js",
     "serve": "vite preview",
     "format": "oxfmt",
-    "format:check": "oxfmt --check"
+    "format:check": "oxfmt --check",
+    "typecheck": "tsc --noEmit -p tsconfig.app.json && tsc --noEmit -p tsconfig.node.json"
   },
   "dependencies": {
     "@atcute/atproto": "^4.0.0",