diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a8a765fd..a7e2b629 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -31,3 +31,4 @@ jobs:
       - uses: Swatinem/rust-cache@v2
       - run: yarn build
       - run: yarn test
+      - run: yarn tsc
diff --git a/node/index.d.ts b/node/index.d.ts
index 8bf1cbb1..92a7365c 100644
--- a/node/index.d.ts
+++ b/node/index.d.ts
@@ -24,9 +24,9 @@ export interface TransformOptions<C extends CustomAtRules> {
   /** The browser targets for the generated code. */
   targets?: Targets,
   /** Features that should always be compiled, even when supported by targets. */
-  include?: Features,
+  include?: number,
   /** Features that should never be compiled, even when unsupported by targets. */
-  exclude?: Features,
+  exclude?: number,
   /** Whether to enable parsing various draft syntax. */
   drafts?: Drafts,
   /** Whether to enable various non-standard syntax. */
diff --git a/node/tsconfig.json b/node/tsconfig.json
new file mode 100644
index 00000000..9b82eaa4
--- /dev/null
+++ b/node/tsconfig.json
@@ -0,0 +1,10 @@
+{
+  "include": ["*.d.ts"],
+  "compilerOptions": {
+    "lib": ["ES2020"],
+    "moduleResolution": "node",
+    "isolatedModules": true,
+    "noEmit": true,
+    "strict": true
+  }
+}
diff --git a/package.json b/package.json
index f6cff42f..1c28b43d 100644
--- a/package.json
+++ b/package.json
@@ -89,6 +89,7 @@
     "website:start": "parcel 'website/*.html' website/playground/index.html",
     "website:build": "yarn wasm:build-release && parcel build 'website/*.html' website/playground/index.html",
     "build-ast": "cargo run --example schema --features jsonschema && node scripts/build-ast.js",
+    "tsc": "tsc -p node/tsconfig.json",
     "test": "uvu node/test"
   }
 }