diff --git a/packages/astro/test/fixtures/astro-typescript/.gitignore b/packages/astro/test/fixtures/astro-typescript/.gitignore
new file mode 100644
index 0000000000..bfe3b8d326
--- /dev/null
+++ b/packages/astro/test/fixtures/astro-typescript/.gitignore
@@ -0,0 +1 @@
+tsconfig.json
\ No newline at end of file
diff --git a/packages/astro/test/fixtures/astro-typescript/astro.config.mjs b/packages/astro/test/fixtures/astro-typescript/astro.config.mjs
new file mode 100644
index 0000000000..882e6515a6
--- /dev/null
+++ b/packages/astro/test/fixtures/astro-typescript/astro.config.mjs
@@ -0,0 +1,4 @@
+import { defineConfig } from 'astro/config';
+
+// https://astro.build/config
+export default defineConfig({});
diff --git a/packages/astro/test/fixtures/astro-typescript/package.json b/packages/astro/test/fixtures/astro-typescript/package.json
new file mode 100644
index 0000000000..65199bbe88
--- /dev/null
+++ b/packages/astro/test/fixtures/astro-typescript/package.json
@@ -0,0 +1,8 @@
+{
+  "name": "@test/astro-typescript",
+  "version": "0.0.0",
+  "private": true,
+  "dependencies": {
+    "astro": "workspace:*"
+  }
+}
diff --git a/packages/astro/test/fixtures/astro-typescript/src/.gitkeep b/packages/astro/test/fixtures/astro-typescript/src/.gitkeep
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/packages/astro/test/typescript.test.js b/packages/astro/test/typescript.test.js
new file mode 100644
index 0000000000..ee1d9006ea
--- /dev/null
+++ b/packages/astro/test/typescript.test.js
@@ -0,0 +1,63 @@
+// @ts-check
+import assert from 'node:assert/strict';
+import { describe, it } from 'node:test';
+import { loadFixture } from './test-utils.js';
+import { fileURLToPath } from 'node:url';
+import { existsSync, rmSync } from 'node:fs';
+
+/**
+ *
+ * @param {Omit<import('../dist/types/public/config.js').AstroUserConfig, "root">} config
+ * @returns
+ */
+const createFixture = async (config = {}) => {
+	/** @type {Awaited<ReturnType<typeof loadFixture>>} */
+	const astroFixture = await loadFixture({ root: './fixtures/astro-typescript/', ...config });
+	const { root } = astroFixture.config;
+	const stringRoot = fileURLToPath(root);
+	rmSync(new URL('./tsconfig.json', root), { force: true });
+	rmSync(new URL('./src/env.d.ts', root), { force: true });
+	rmSync(new URL('./.astro', root), { force: true, recursive: true });
+
+	return {
+		sync: () => astroFixture.sync({ root: stringRoot }),
+		/** @param {string} path */
+		fileExists: (path) => {
+			return existsSync(new URL(path, root));
+		},
+	};
+};
+
+describe('experimental.typescript', () => {
+	it('should create .astro/tsconfig.json if experimental.typescript is enabled', async () => {
+		const fixture = await createFixture({ experimental: { typescript: {} } });
+		await fixture.sync();
+		assert.equal(fixture.fileExists('./.astro/tsconfig.json'), true);
+	});
+
+	it('should not create src/env.d.ts if experimental.typescript is enabled', async () => {});
+
+	it('should not create .astro/tsconfig.json if experimental.typescript is disabled', async () => {});
+
+	it('should create src/env.d.ts if experimental.typescript is disabled', async () => {});
+
+	it('should throw if tsconfig.json has invalid extends', async () => {});
+
+	it('should throw if tsconfig.json has invalid include', async () => {});
+
+	it('should throw if tsconfig.json has invalid exclude', async () => {});
+
+	it('should add outDir to .astro/tsconfig.json', async () => {});
+
+	it('should handle include/exclude relative paths', async () => {});
+
+	it('should work with astro check', async () => {});
+
+	it('should work in dev', async () => {});
+
+	it('should work in build', async () => {});
+
+	it('should work in sync', async () => {});
+
+	it('should create a tsconfig.json if it does not exist yet', async () => {});
+});
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 4563fdae50..e37cdd8ade 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -2457,6 +2457,12 @@ importers:
         specifier: ^3.4.38
         version: 3.4.38(typescript@5.5.4)
 
+  packages/astro/test/fixtures/astro-typescript:
+    dependencies:
+      astro:
+        specifier: workspace:*
+        version: link:../../..
+
   packages/astro/test/fixtures/before-hydration:
     dependencies:
       '@astrojs/preact':