diff --git a/package-lock.json b/package-lock.json
index 7020f0a..ca152f5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,6 +10,7 @@
       "license": "MIT",
       "devDependencies": {
         "@preact/signals-core": "^1.5.1",
+        "@types/node": "^25.6.0",
         "inline-schema": "file:../inline-schema",
         "mutative": "^1.3.0",
         "tsup": "^8.0.2",
@@ -958,6 +959,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/node": {
+      "version": "25.6.0",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-25.6.0.tgz",
+      "integrity": "sha512-+qIYRKdNYJwY3vRCZMdJbPLJAtGjQBudzZzdzwQYkEPQd+PJGixUL5QfvCLDaULoLv+RhT3LDkwEfKaAkgSmNQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~7.19.0"
+      }
+    },
     "node_modules/@vitest/expect": {
       "version": "1.6.1",
       "resolved": "https://registry.npmjs.org/@vitest/expect/-/expect-1.6.1.tgz",
@@ -2469,6 +2480,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/undici-types": {
+      "version": "7.19.2",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.19.2.tgz",
+      "integrity": "sha512-qYVnV5OEm2AW8cJMCpdV20CDyaN3g0AjDlOGf1OW4iaDEx8MwdtChUp4zu4H0VP3nDRF/8RKWH+IPp9uW0YGZg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/vite": {
       "version": "5.4.21",
       "resolved": "https://registry.npmjs.org/vite/-/vite-5.4.21.tgz",
diff --git a/package.json b/package.json
index 8e7b84b..aa8f13d 100644
--- a/package.json
+++ b/package.json
@@ -30,6 +30,7 @@
   },
   "devDependencies": {
     "@preact/signals-core": "^1.5.1",
+    "@types/node": "^25.6.0",
     "inline-schema": "file:../inline-schema",
     "mutative": "^1.3.0",
     "tsup": "^8.0.2",
diff --git a/tsconfig.json b/tsconfig.json
index b685aae..829ed99 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -5,6 +5,7 @@
     "lib": ["ES2020"],
     "moduleResolution": "bundler",
     "strict": true,
+    "types": ["node"],
     "esModuleInterop": true,
     "skipLibCheck": true,
     "forceConsistentCasingInFileNames": true,
@@ -18,6 +19,6 @@
       "@/*": ["src/*"],
     },
   },
-  "include": ["src/**/*", "tests/**/*"],
+  "include": ["src/**/*", "tests/**/*", "*.config.ts"],
   "exclude": ["node_modules", "dist"],
 }
diff --git a/tsup.config.ts b/tsup.config.ts
index 1593055..ec0cc7c 100644
--- a/tsup.config.ts
+++ b/tsup.config.ts
@@ -1,20 +1,20 @@
-import { defineConfig } from 'tsup';
-import { fileURLToPath } from 'url';
-import { csvLoader } from 'inline-schema/csv-loader/rollup';
+import { defineConfig } from "tsup";
+import { fileURLToPath } from "url";
+import { csvLoader } from "inline-schema/csv-loader/rollup";
 
-const srcDir = fileURLToPath(new URL('./src', import.meta.url));
+const srcDir = fileURLToPath(new URL("./src", import.meta.url));
 
 export default defineConfig({
-  entry: ['src/index.ts'],
-  format: ['esm'],
+  entry: ["src/index.ts"],
+  format: ["esm"],
   dts: true,
   clean: true,
   sourcemap: true,
-  external: ['@preact/signals-core', 'mutative', 'inline-schema'],
+  external: ["@preact/signals-core", "mutative", "inline-schema"],
   plugins: [csvLoader()],
   esbuildOptions(options) {
     options.alias = {
-      '@': srcDir,
+      "@": srcDir,
     };
   },
 });