diff --git a/.github/workflows/tsc.yml b/.github/workflows/tsc.yml
new file mode 100644
index 00000000..784c4d76
--- /dev/null
+++ b/.github/workflows/tsc.yml
@@ -0,0 +1,37 @@
+# Copied from https://github.com/facebook/docusaurus/blob/main/.github/workflows/lint.yml
+name: Typecheck
+
+on:
+  pull_request:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  tsc:
+    name: Typecheck
+    timeout-minutes: 30
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Set up Node
+        uses: actions/setup-node@v3
+        with:
+          node-version: '16'
+          cache: yarn
+      - name: Installation
+        run: yarn
+      - name: Check immutable yarn.lock
+        run: git diff --exit-code
+      # Build the shared types in dependent packages.
+      - name: Build dependencies
+        run: yarn turbo run build --filter=ui
+      - name: Typecheck
+        run: yarn tsc
diff --git a/apps/storybook/package.json b/apps/storybook/package.json
index df648014..546cf92c 100644
--- a/apps/storybook/package.json
+++ b/apps/storybook/package.json
@@ -4,7 +4,7 @@
   "private": true,
   "scripts": {
     "dev": "start-storybook -p 6001",
-    "build": "build-storybook --docs",
+    "build": "tsc && build-storybook --docs",
     "preview-storybook": "serve storybook-static",
     "clean": "rm -rf .turbo && rm -rf node_modules",
     "lint": "eslint stories/**/*.ts* --fix",
diff --git a/package.json b/package.json
index b2b855c5..4c0a4f70 100755
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     "dev:ui": "turbo dev --filter=storybook... --filter=ui...",
     "dev:website": "turbo dev --filter=website...",
     "dev:all": "turbo dev --no-cache --parallel --continue",
-    "format": "prettier --write \"**/*.{ts,tsx,md}\"",
+    "format": "prettier --write \"**/*.{js,jsx,cjs,mjs,ts,tsx,md,mdx}\"",
     "lint": "turbo lint",
     "test": "turbo test",
     "tsc": "turbo tsc"