diff --git a/.changeset/fifty-books-jam.md b/.changeset/fifty-books-jam.md
new file mode 100644
index 000000000..ab3694519
--- /dev/null
+++ b/.changeset/fifty-books-jam.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Fix TypeScript "types" reference in package.json
diff --git a/.changeset/gentle-carrots-decide.md b/.changeset/gentle-carrots-decide.md
new file mode 100644
index 000000000..604ea72f4
--- /dev/null
+++ b/.changeset/gentle-carrots-decide.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Improve schema validation using zod
diff --git a/examples/blog-multiple-authors/astro.config.mjs b/examples/blog-multiple-authors/astro.config.mjs
index 88a052f97..68499b3fa 100644
--- a/examples/blog-multiple-authors/astro.config.mjs
+++ b/examples/blog-multiple-authors/astro.config.mjs
@@ -1,15 +1,13 @@
-export default {
-  // projectRoot: '.',     // Where to resolve all URLs relative to. Useful if you have a monorepo project.
-  // pages: './src/pages', // Path to Astro components, pages, and data
-  // dist: './dist',       // When running `astro build`, path to final static output
-  // public: './public',   // A folder of static files Astro will copy to the root. Useful for favicons, images, and other files that don’t need processing.
-  buildOptions: {
-    site: 'http://example.com', // Your public domain, e.g.: https://my-site.dev/. Used to generate sitemaps and canonical URLs.
-    sitemap: true, // Generate sitemap (set to "false" to disable)
-  },
-  devOptions: {
-    // port: 3000,         // The port to run the dev server on.
-    // tailwindConfig: '', // Path to tailwind.config.js if used, e.g. './tailwind.config.js'
-  },
+// Full Astro Configuration API Documentation:
+// https://docs.astro.build/reference/configuration-reference
+
+// @type-check enabled!
+// VSCode and other TypeScript-enabled text editors will provide auto-completion,
+// helpful tooltips, and warnings if your exported object is invalid.
+// You can disable this by removing "@ts-check" and `@type` comments below.
+
+// @ts-check
+export default /** @type {import('astro').AstroUserConfig} */ ({
+  // Enable the Preact renderer to support Preact JSX components.
   renderers: ['@astrojs/renderer-preact'],
-};
+});
diff --git a/examples/blog/astro.config.mjs b/examples/blog/astro.config.mjs
index 2c8e9130e..68499b3fa 100644
--- a/examples/blog/astro.config.mjs
+++ b/examples/blog/astro.config.mjs
@@ -1,15 +1,13 @@
-export default {
-  // projectRoot: '.',     // Where to resolve all URLs relative to. Useful if you have a monorepo project.
-  // pages: './src/pages', // Path to Astro components, pages, and data
-  // dist: './dist',       // When running `astro build`, path to final static output
-  // public: './public',   // A folder of static files Astro will copy to the root. Useful for favicons, images, and other files that don’t need processing.
-  buildOptions: {
-    // site: 'http://example.com',           // Your public domain, e.g.: https://my-site.dev/. Used to generate sitemaps and canonical URLs.
-    sitemap: true, // Generate sitemap (set to "false" to disable)
-  },
-  devOptions: {
-    // port: 3000,         // The port to run the dev server on.
-    // tailwindConfig: '', // Path to tailwind.config.js if used, e.g. './tailwind.config.js'
-  },
+// Full Astro Configuration API Documentation:
+// https://docs.astro.build/reference/configuration-reference
+
+// @type-check enabled!
+// VSCode and other TypeScript-enabled text editors will provide auto-completion,
+// helpful tooltips, and warnings if your exported object is invalid.
+// You can disable this by removing "@ts-check" and `@type` comments below.
+
+// @ts-check
+export default /** @type {import('astro').AstroUserConfig} */ ({
+  // Enable the Preact renderer to support Preact JSX components.
   renderers: ['@astrojs/renderer-preact'],
-};
+});
diff --git a/examples/docs/astro.config.mjs b/examples/docs/astro.config.mjs
index 7af3aef7f..68499b3fa 100644
--- a/examples/docs/astro.config.mjs
+++ b/examples/docs/astro.config.mjs
@@ -1,15 +1,13 @@
-export default {
-  // projectRoot: '.',     // Where to resolve all URLs relative to. Useful if you have a monorepo project.
-  // pages: './src/pages', // Path to Astro components, pages, and data
-  // dist: './dist',       // When running `astro build`, path to final static output
-  // public: './public',   // A folder of static files Astro will copy to the root. Useful for favicons, images, and other files that don’t need processing.
-  buildOptions: {
-    // site: 'http://example.com',           // Your public domain, e.g.: https://my-site.dev/. Used to generate sitemaps and canonical URLs.
-    // sitemap: true,       // Generate sitemap (set to "false" to disable)
-  },
-  devOptions: {
-    // port: 3000,         // The port to run the dev server on.
-    // tailwindConfig: '', // Path to tailwind.config.js if used, e.g. './tailwind.config.js'
-  },
+// Full Astro Configuration API Documentation:
+// https://docs.astro.build/reference/configuration-reference
+
+// @type-check enabled!
+// VSCode and other TypeScript-enabled text editors will provide auto-completion,
+// helpful tooltips, and warnings if your exported object is invalid.
+// You can disable this by removing "@ts-check" and `@type` comments below.
+
+// @ts-check
+export default /** @type {import('astro').AstroUserConfig} */ ({
+  // Enable the Preact renderer to support Preact JSX components.
   renderers: ['@astrojs/renderer-preact'],
-};
+});
diff --git a/examples/framework-lit/astro.config.mjs b/examples/framework-lit/astro.config.mjs
index e4cabec8f..6a053bcc5 100644
--- a/examples/framework-lit/astro.config.mjs
+++ b/examples/framework-lit/astro.config.mjs
@@ -1,15 +1,13 @@
-export default {
-  // projectRoot: '.',     // Where to resolve all URLs relative to. Useful if you have a monorepo project.
-  // pages: './src/pages',   // Path to Astro components, pages, and data
-  // dist: './dist',       // When running `astro build`, path to final static output
-  // public: './public',   // A folder of static files Astro will copy to the root. Useful for favicons, images, and other files that don’t need processing.
-  buildOptions: {
-    // site: 'http://example.com',           // Your public domain, e.g.: https://my-site.dev/. Used to generate sitemaps and canonical URLs.
-    // sitemap: true,      // Generate sitemap (set to "false" to disable)
-  },
-  devOptions: {
-    // port: 3000,         // The port to run the dev server on.
-    // tailwindConfig: '', // Path to tailwind.config.js if used, e.g. './tailwind.config.js'
-  },
+// Full Astro Configuration API Documentation:
+// https://docs.astro.build/reference/configuration-reference
+
+// @type-check enabled!
+// VSCode and other TypeScript-enabled text editors will provide auto-completion,
+// helpful tooltips, and warnings if your exported object is invalid.
+// You can disable this by removing "@ts-check" and `@type` comments below.
+
+// @ts-check
+export default /** @type {import('astro').AstroUserConfig} */ ({
+  // Enable the lit renderer to support LitHTML components and templates.
   renderers: ['@astrojs/renderer-lit'],
-};
+});
diff --git a/examples/framework-multiple/astro.config.mjs b/examples/framework-multiple/astro.config.mjs
index ee1983a24..b5fe6a073 100644
--- a/examples/framework-multiple/astro.config.mjs
+++ b/examples/framework-multiple/astro.config.mjs
@@ -1,15 +1,13 @@
-export default {
-  // projectRoot: '.',     // Where to resolve all URLs relative to. Useful if you have a monorepo project.
-  // pages: './src/pages', // Path to Astro components, pages, and data
-  // dist: './dist',       // When running `astro build`, path to final static output
-  // public: './public',   // A folder of static files Astro will copy to the root. Useful for favicons, images, and other files that don’t need processing.
-  buildOptions: {
-    // site: 'http://example.com',  // Your public domain, e.g.: https://my-site.dev/. Used to generate sitemaps and canonical URLs.
-    // sitemap: true,      // Generate sitemap (set to "false" to disable)
-  },
-  devOptions: {
-    // port: 3000,         // The port to run the dev server on.
-    // tailwindConfig: '', // Path to tailwind.config.js if used, e.g. './tailwind.config.js'
-  },
+// Full Astro Configuration API Documentation:
+// https://docs.astro.build/reference/configuration-reference
+
+// @type-check enabled!
+// VSCode and other TypeScript-enabled text editors will provide auto-completion,
+// helpful tooltips, and warnings if your exported object is invalid.
+// You can disable this by removing "@ts-check" and `@type` comments below.
+
+// @ts-check
+export default /** @type {import('astro').AstroUserConfig} */ ({
+  // Enable many renderers to support all different kinds of components.
   renderers: ['@astrojs/renderer-preact', '@astrojs/renderer-react', '@astrojs/renderer-svelte', '@astrojs/renderer-vue', '@astrojs/renderer-solid'],
-};
+});
diff --git a/examples/framework-preact/astro.config.mjs b/examples/framework-preact/astro.config.mjs
index 350d6c7de..68499b3fa 100644
--- a/examples/framework-preact/astro.config.mjs
+++ b/examples/framework-preact/astro.config.mjs
@@ -1,15 +1,13 @@
-export default {
-  // projectRoot: '.',     // Where to resolve all URLs relative to. Useful if you have a monorepo project.
-  // pages: './src/pages', // Path to Astro components, pages, and data
-  // dist: './dist',       // When running `astro build`, path to final static output
-  // public: './public',   // A folder of static files Astro will copy to the root. Useful for favicons, images, and other files that don’t need processing.
-  buildOptions: {
-    // site: 'http://example.com',  // Your public domain, e.g.: https://my-site.dev/. Used to generate sitemaps and canonical URLs.
-    // sitemap: true,      // Generate sitemap (set to "false" to disable)
-  },
-  devOptions: {
-    // port: 3000,         // The port to run the dev server on.
-    // tailwindConfig: '', // Path to tailwind.config.js if used, e.g. './tailwind.config.js'
-  },
+// Full Astro Configuration API Documentation:
+// https://docs.astro.build/reference/configuration-reference
+
+// @type-check enabled!
+// VSCode and other TypeScript-enabled text editors will provide auto-completion,
+// helpful tooltips, and warnings if your exported object is invalid.
+// You can disable this by removing "@ts-check" and `@type` comments below.
+
+// @ts-check
+export default /** @type {import('astro').AstroUserConfig} */ ({
+  // Enable the Preact renderer to support Preact JSX components.
   renderers: ['@astrojs/renderer-preact'],
-};
+});
diff --git a/examples/framework-react/astro.config.mjs b/examples/framework-react/astro.config.mjs
index da818c2be..1d13cb140 100644
--- a/examples/framework-react/astro.config.mjs
+++ b/examples/framework-react/astro.config.mjs
@@ -1,15 +1,13 @@
-export default {
-  // projectRoot: '.',     // Where to resolve all URLs relative to. Useful if you have a monorepo project.
-  // pages: './src/pages', // Path to Astro components, pages, and data
-  // dist: './dist',       // When running `astro build`, path to final static output
-  // public: './public',   // A folder of static files Astro will copy to the root. Useful for favicons, images, and other files that don’t need processing.
-  buildOptions: {
-    // site: 'http://example.com',  // Your public domain, e.g.: https://my-site.dev/. Used to generate sitemaps and canonical URLs.
-    // sitemap: true,      // Generate sitemap (set to "false" to disable)
-  },
-  devOptions: {
-    // port: 3000,         // The port to run the dev server on.
-    // tailwindConfig: '', // Path to tailwind.config.js if used, e.g. './tailwind.config.js'
-  },
+// Full Astro Configuration API Documentation:
+// https://docs.astro.build/reference/configuration-reference
+
+// @type-check enabled!
+// VSCode and other TypeScript-enabled text editors will provide auto-completion,
+// helpful tooltips, and warnings if your exported object is invalid.
+// You can disable this by removing "@ts-check" and `@type` comments below.
+
+// @ts-check
+export default /** @type {import('astro').AstroUserConfig} */ ({
+  // Enable the React renderer to support React JSX components.
   renderers: ['@astrojs/renderer-react'],
-};
+});
diff --git a/examples/framework-solid/astro.config.mjs b/examples/framework-solid/astro.config.mjs
index 59dd75f56..afb71e071 100644
--- a/examples/framework-solid/astro.config.mjs
+++ b/examples/framework-solid/astro.config.mjs
@@ -1,15 +1,13 @@
-export default {
-  // projectRoot: '.',     // Where to resolve all URLs relative to. Useful if you have a monorepo project.
-  // pages: './src/pages', // Path to Astro components, pages, and data
-  // dist: './dist',       // When running `astro build`, path to final static output
-  // public: './public',   // A folder of static files Astro will copy to the root. Useful for favicons, images, and other files that don’t need processing.
-  buildOptions: {
-    // site: 'http://example.com',  // Your public domain, e.g.: https://my-site.dev/. Used to generate sitemaps and canonical URLs.
-    // sitemap: true,      // Generate sitemap (set to "false" to disable)
-  },
-  devOptions: {
-    // port: 3000,         // The port to run the dev server on.
-    // tailwindConfig: '', // Path to tailwind.config.js if used, e.g. './tailwind.config.js'
-  },
+// Full Astro Configuration API Documentation:
+// https://docs.astro.build/reference/configuration-reference
+
+// @type-check enabled!
+// VSCode and other TypeScript-enabled text editors will provide auto-completion,
+// helpful tooltips, and warnings if your exported object is invalid.
+// You can disable this by removing "@ts-check" and `@type` comments below.
+
+// @ts-check
+export default /** @type {import('astro').AstroUserConfig} */ ({
+  // Enable the Solid renderer to support Solid JSX components.
   renderers: ['@astrojs/renderer-solid'],
-};
+});
diff --git a/examples/framework-svelte/astro.config.mjs b/examples/framework-svelte/astro.config.mjs
index 40dbab1ad..3e7d4acdb 100644
--- a/examples/framework-svelte/astro.config.mjs
+++ b/examples/framework-svelte/astro.config.mjs
@@ -1,15 +1,13 @@
-export default {
-  // projectRoot: '.',     // Where to resolve all URLs relative to. Useful if you have a monorepo project.
-  // pages: './src/pages', // Path to Astro components, pages, and data
-  // dist: './dist',       // When running `astro build`, path to final static output
-  // public: './public',   // A folder of static files Astro will copy to the root. Useful for favicons, images, and other files that don’t need processing.
-  buildOptions: {
-    // site: 'http://example.com',  // Your public domain, e.g.: https://my-site.dev/. Used to generate sitemaps and canonical URLs.
-    // sitemap: true,      // Generate sitemap (set to "false" to disable)
-  },
-  devOptions: {
-    // port: 3000,         // The port to run the dev server on.
-    // tailwindConfig: '', // Path to tailwind.config.js if used, e.g. './tailwind.config.js'
-  },
+// Full Astro Configuration API Documentation:
+// https://docs.astro.build/reference/configuration-reference
+
+// @type-check enabled!
+// VSCode and other TypeScript-enabled text editors will provide auto-completion,
+// helpful tooltips, and warnings if your exported object is invalid.
+// You can disable this by removing "@ts-check" and `@type` comments below.
+
+// @ts-check
+export default /** @type {import('astro').AstroUserConfig} */ ({
+  // Enable the Svelte renderer to support Svelte components.
   renderers: ['@astrojs/renderer-svelte'],
-};
+});
diff --git a/examples/framework-vue/astro.config.mjs b/examples/framework-vue/astro.config.mjs
index 964aa2145..c60760357 100644
--- a/examples/framework-vue/astro.config.mjs
+++ b/examples/framework-vue/astro.config.mjs
@@ -1,15 +1,13 @@
-export default {
-  // projectRoot: '.',     // Where to resolve all URLs relative to. Useful if you have a monorepo project.
-  // pages: './src/pages', // Path to Astro components, pages, and data
-  // dist: './dist',       // When running `astro build`, path to final static output
-  // public: './public',   // A folder of static files Astro will copy to the root. Useful for favicons, images, and other files that don’t need processing.
-  buildOptions: {
-    // site: 'http://example.com',  // Your public domain, e.g.: https://my-site.dev/. Used to generate sitemaps and canonical URLs.
-    // sitemap: true,      // Generate sitemap (set to "false" to disable)
-  },
-  devOptions: {
-    // port: 3000,         // The port to run the dev server on.
-    // tailwindConfig: '', // Path to tailwind.config.js if used, e.g. './tailwind.config.js'
-  },
+// Full Astro Configuration API Documentation:
+// https://docs.astro.build/reference/configuration-reference
+
+// @type-check enabled!
+// VSCode and other TypeScript-enabled text editors will provide auto-completion,
+// helpful tooltips, and warnings if your exported object is invalid.
+// You can disable this by removing "@ts-check" and `@type` comments below.
+
+// @ts-check
+export default /** @type {import('astro').AstroUserConfig} */ ({
+  // Enable the Vue renderer to support Vue components.
   renderers: ['@astrojs/renderer-vue'],
-};
+});
diff --git a/examples/minimal/astro.config.mjs b/examples/minimal/astro.config.mjs
index fcc415092..b6397b312 100644
--- a/examples/minimal/astro.config.mjs
+++ b/examples/minimal/astro.config.mjs
@@ -1,3 +1,13 @@
-export default {
+// Full Astro Configuration API Documentation:
+// https://docs.astro.build/reference/configuration-reference
+
+// @type-check enabled!
+// VSCode and other TypeScript-enabled text editors will provide auto-completion,
+// helpful tooltips, and warnings if your exported object is invalid.
+// You can disable this by removing "@ts-check" and `@type` comments below.
+
+// @ts-check
+export default /** @type {import('astro').AstroUserConfig} */ ({
+  // Set "renderers" to "[]" to disable all default, builtin component support.
   renderers: [],
-};
+});
diff --git a/examples/portfolio/astro.config.mjs b/examples/portfolio/astro.config.mjs
index 350d6c7de..68499b3fa 100644
--- a/examples/portfolio/astro.config.mjs
+++ b/examples/portfolio/astro.config.mjs
@@ -1,15 +1,13 @@
-export default {
-  // projectRoot: '.',     // Where to resolve all URLs relative to. Useful if you have a monorepo project.
-  // pages: './src/pages', // Path to Astro components, pages, and data
-  // dist: './dist',       // When running `astro build`, path to final static output
-  // public: './public',   // A folder of static files Astro will copy to the root. Useful for favicons, images, and other files that don’t need processing.
-  buildOptions: {
-    // site: 'http://example.com',  // Your public domain, e.g.: https://my-site.dev/. Used to generate sitemaps and canonical URLs.
-    // sitemap: true,      // Generate sitemap (set to "false" to disable)
-  },
-  devOptions: {
-    // port: 3000,         // The port to run the dev server on.
-    // tailwindConfig: '', // Path to tailwind.config.js if used, e.g. './tailwind.config.js'
-  },
+// Full Astro Configuration API Documentation:
+// https://docs.astro.build/reference/configuration-reference
+
+// @type-check enabled!
+// VSCode and other TypeScript-enabled text editors will provide auto-completion,
+// helpful tooltips, and warnings if your exported object is invalid.
+// You can disable this by removing "@ts-check" and `@type` comments below.
+
+// @ts-check
+export default /** @type {import('astro').AstroUserConfig} */ ({
+  // Enable the Preact renderer to support Preact JSX components.
   renderers: ['@astrojs/renderer-preact'],
-};
+});
diff --git a/examples/starter/astro.config.mjs b/examples/starter/astro.config.mjs
index 706dce85b..81dadc1ea 100644
--- a/examples/starter/astro.config.mjs
+++ b/examples/starter/astro.config.mjs
@@ -1,14 +1,12 @@
-export default {
-  // projectRoot: '.',     // Where to resolve all URLs relative to. Useful if you have a monorepo project.
-  // pages: './src/pages', // Path to Astro components, pages, and data
-  // dist: './dist',       // When running `astro build`, path to final static output
-  // public: './public',   // A folder of static files Astro will copy to the root. Useful for favicons, images, and other files that don’t need processing.
-  buildOptions: {
-    // site: 'http://example.com',  // Your public domain, e.g.: https://my-site.dev/. Used to generate sitemaps and canonical URLs.
-    // sitemap: true,      // Generate sitemap (set to "false" to disable)
-  },
-  devOptions: {
-    // port: 3000,         // The port to run the dev server on.
-    // tailwindConfig: '', // Path to tailwind.config.js if used, e.g. './tailwind.config.js'
-  },
-};
+// Full Astro Configuration API Documentation:
+// https://docs.astro.build/reference/configuration-reference
+
+// @type-check enabled!
+// VSCode and other TypeScript-enabled text editors will provide auto-completion,
+// helpful tooltips, and warnings if your exported object is invalid.
+// You can disable this by removing "@ts-check" and `@type` comments below.
+
+// @ts-check
+export default /** @type {import('astro').AstroUserConfig} */ ({
+  // ...
+});
diff --git a/examples/with-markdown-plugins/astro.config.mjs b/examples/with-markdown-plugins/astro.config.mjs
index e02cde821..690d8f434 100644
--- a/examples/with-markdown-plugins/astro.config.mjs
+++ b/examples/with-markdown-plugins/astro.config.mjs
@@ -1,12 +1,14 @@
-export default {
-  // projectRoot: '.',     // Where to resolve all URLs relative to. Useful if you have a monorepo project.
-  // pages: './src/pages',   // Path to Astro components, pages, and data
-  // dist: './dist',       // When running `astro build`, path to final static output
-  // public: './public',   // A folder of static files Astro will copy to the root. Useful for favicons, images, and other files that don’t need processing.
-  buildOptions: {
-    site: 'http://example.com', // Your public domain, e.g.: https://my-site.dev/. Used to generate sitemaps and canonical URLs.
-    // sitemap: true,      // Generate sitemap (set to "false" to disable)
-  },
+// Full Astro Configuration API Documentation:
+// https://docs.astro.build/reference/configuration-reference
+
+// @type-check enabled!
+// VSCode and other TypeScript-enabled text editors will provide auto-completion,
+// helpful tooltips, and warnings if your exported object is invalid.
+// You can disable this by removing "@ts-check" and `@type` comments below.
+
+// @ts-check
+export default /** @type {import('astro').AstroUserConfig} */ ({
+  // Enable Custom Markdown options, plugins, etc.
   markdownOptions: {
     remarkPlugins: ['remark-code-titles', 'remark-slug', ['remark-autolink-headings', { behavior: 'prepend' }]],
     rehypePlugins: [
@@ -14,8 +16,4 @@ export default {
       ['rehype-add-classes', { 'h1,h2,h3': 'title' }],
     ],
   },
-  devOptions: {
-    // port: 3000,         // The port to run the dev server on.
-    // tailwindConfig: '', // Path to tailwind.config.js if used, e.g. './tailwind.config.js'
-  },
-};
+});
diff --git a/examples/with-nanostores/astro.config.mjs b/examples/with-nanostores/astro.config.mjs
index fcabea809..b5fe6a073 100644
--- a/examples/with-nanostores/astro.config.mjs
+++ b/examples/with-nanostores/astro.config.mjs
@@ -1,15 +1,13 @@
-export default {
-  // projectRoot: '.',     // Where to resolve all URLs relative to. Useful if you have a monorepo project.
-  // pages: './src/pages', // Path to Astro components, pages, and data
-  // dist: './dist',       // When running `astro build`, path to final static output
-  // public: './public',   // A folder of static files Astro will copy to the root. Useful for favicons, images, and other files that don’t need processing.
-  buildOptions: {
-    // site: 'http://example.com',  // Your public domain, e.g.: https://my-site.dev/. Used to generate sitemaps and canonical URLs.
-    // sitemap: true,      // Generate sitemap (set to "false" to disable)
-  },
-  devOptions: {
-    // port: 3000,         // The port to run the dev server on.
-    // tailwindConfig: './tailwind.config.js', // Path to tailwind.config.js if used, e.g. './tailwind.config.js'
-  },
-  renderers: ['@astrojs/renderer-preact', '@astrojs/renderer-react', '@astrojs/renderer-svelte', '@astrojs/renderer-vue'],
-};
+// Full Astro Configuration API Documentation:
+// https://docs.astro.build/reference/configuration-reference
+
+// @type-check enabled!
+// VSCode and other TypeScript-enabled text editors will provide auto-completion,
+// helpful tooltips, and warnings if your exported object is invalid.
+// You can disable this by removing "@ts-check" and `@type` comments below.
+
+// @ts-check
+export default /** @type {import('astro').AstroUserConfig} */ ({
+  // Enable many renderers to support all different kinds of components.
+  renderers: ['@astrojs/renderer-preact', '@astrojs/renderer-react', '@astrojs/renderer-svelte', '@astrojs/renderer-vue', '@astrojs/renderer-solid'],
+});
diff --git a/examples/with-tailwindcss/astro.config.mjs b/examples/with-tailwindcss/astro.config.mjs
index f93e801ce..e94cfab62 100644
--- a/examples/with-tailwindcss/astro.config.mjs
+++ b/examples/with-tailwindcss/astro.config.mjs
@@ -1,15 +1,17 @@
-export default {
-  // projectRoot: '.',     // Where to resolve all URLs relative to. Useful if you have a monorepo project.
-  // pages: './src/pages', // Path to Astro components, pages, and data
-  // dist: './dist',       // When running `astro build`, path to final static output
-  // public: './public',   // A folder of static files Astro will copy to the root. Useful for favicons, images, and other files that don’t need processing.
-  buildOptions: {
-    // site: 'http://example.com',           // Your public domain, e.g.: https://my-site.dev/. Used to generate sitemaps and canonical URLs.
-    sitemap: true, // Generate sitemap (set to "false" to disable)
-  },
+// Full Astro Configuration API Documentation:
+// https://docs.astro.build/reference/configuration-reference
+
+// @type-check enabled!
+// VSCode and other TypeScript-enabled text editors will provide auto-completion,
+// helpful tooltips, and warnings if your exported object is invalid.
+// You can disable this by removing "@ts-check" and `@type` comments below.
+
+// @ts-check
+export default /** @type {import('astro').AstroUserConfig} */ ({
+  // Enable Tailwind by telling Astro where your Tailwind config file lives.
   devOptions: {
-    // port: 3000,         // The port to run the dev server on.
-    tailwindConfig: './tailwind.config.js', // Path to tailwind.config.js if used, e.g. './tailwind.config.js'
+    tailwindConfig: './tailwind.config.js', 
   },
+  // Enable the Preact renderer to support Preact JSX components.
   renderers: ['@astrojs/renderer-preact'],
-};
+});
diff --git a/packages/astro/package.json b/packages/astro/package.json
index 1fca0a9fc..9e979d65b 100644
--- a/packages/astro/package.json
+++ b/packages/astro/package.json
@@ -4,7 +4,7 @@
   "author": "Skypack",
   "license": "MIT",
   "type": "module",
-  "types": "./dist/types",
+  "types": "./dist/types/@types/public.d.ts",
   "repository": {
     "type": "git",
     "url": "https://github.com/snowpackjs/astro.git",
@@ -97,7 +97,8 @@
     "supports-esm": "^1.0.0",
     "tiny-glob": "^0.2.8",
     "unified": "^9.2.1",
-    "yargs-parser": "^20.2.7"
+    "yargs-parser": "^20.2.7",
+    "zod": "^3.8.1"
   },
   "devDependencies": {
     "@babel/types": "^7.14.0",
diff --git a/packages/astro/src/@types/astro.ts b/packages/astro/src/@types/astro.ts
index bd9986a1f..88aabeff4 100644
--- a/packages/astro/src/@types/astro.ts
+++ b/packages/astro/src/@types/astro.ts
@@ -1,7 +1,7 @@
 import type { ImportSpecifier, ImportDefaultSpecifier, ImportNamespaceSpecifier } from '@babel/types';
-import type { AstroMarkdownOptions } from '@astrojs/markdown-support';
-import type { AstroConfig } from './config';
+import type { AstroUserConfig, AstroConfig } from './config';
 
+export { AstroUserConfig, AstroConfig };
 export interface RouteData {
   type: 'page';
   pattern: RegExp;
@@ -14,28 +14,7 @@ export interface RouteData {
 export interface ManifestData {
   routes: RouteData[];
 }
-export interface AstroConfigRaw {
-  dist: string;
-  projectRoot: string;
-  src: string;
-  pages: string;
-  public: string;
-  jsx?: string;
-}
 
-export { AstroMarkdownOptions, AstroConfig };
-
-export type AstroUserConfig = Omit<AstroConfig, 'buildOptions' | 'devOptions'> & {
-  buildOptions: {
-    sitemap: boolean;
-  };
-  devOptions: {
-    hostname?: string;
-    port?: number;
-    projectRoot?: string;
-    tailwindConfig?: string;
-  };
-};
 
 export interface JsxItem {
   name: string;
diff --git a/packages/astro/src/@types/config.ts b/packages/astro/src/@types/config.ts
index a3699ad04..585f4687b 100644
--- a/packages/astro/src/@types/config.ts
+++ b/packages/astro/src/@types/config.ts
@@ -1,32 +1,39 @@
 import type { AstroMarkdownOptions } from '@astrojs/markdown-support';
-export interface AstroConfig {
+import type { AstroConfigSchema } from '../config';
+import type { z } from 'zod';
+
+/**
+ * The Astro User Config Format: 
+ * This is the type interface for your astro.config.mjs default export.
+ */
+export interface AstroUserConfig {
   /**
    * Where to resolve all URLs relative to. Useful if you have a monorepo project.
    * Default: '.' (current working directory)
    */
-  projectRoot: URL;
+  projectRoot?: string;
   /**
    * Path to the `astro build` output.
    * Default: './dist'
    */
-  dist: string;
+  dist?: string;
   /**
    * Path to all of your Astro components, pages, and data.
    * Default: './src'
    */
-  src: URL;
+  src?: string;
   /**
    * Path to your Astro/Markdown pages. Each file in this directory
    * becomes a page in your final build.
    * Default: './src/pages'
    */
-  pages: URL;
+  pages?: string;
   /**
    * Path to your public files. These are copied over into your build directory, untouched.
    * Useful for favicons, images, and other files that don't need processing.
    * Default: './public'
    */
-  public: URL;
+  public?: string;
   /**
    * Framework component renderers enable UI framework rendering (static and dynamic).
    * When you define this in your configuration, all other defaults are disabled.
@@ -41,26 +48,26 @@ export interface AstroConfig {
   /** Options for rendering markdown content */
   markdownOptions?: Partial<AstroMarkdownOptions>;
   /** Options specific to `astro build` */
-  buildOptions: {
+  buildOptions?: {
     /** Your public domain, e.g.: https://my-site.dev/. Used to generate sitemaps and canonical URLs. */
     site?: string;
     /** Generate an automatically-generated sitemap for your build.
      * Default: true
      */
-    sitemap: boolean;
+    sitemap?: boolean;
     /**
-     * Control the output file/URL format of each page.
-     *   If true, Astro will generate a directory with a nested index.html (ex: "/foo/index.html") for each page.
-     *   If false, Astro will generate a matching HTML file (ex: "/foo.html") instead of a directory.
-     * Default: true
+     * Control the output file URL format of each page.
+     *   If 'file', Astro will generate a matching HTML file (ex: "/foo.html") instead of a directory.
+     *   If 'directory', Astro will generate a directory with a nested index.html (ex: "/foo/index.html") for each page.
+     * Default: 'directory'
      */
-    pageDirectoryUrl: boolean;
+    pageUrlFormat?: 'file' | 'directory';
   };
   /** Options for the development server run with `astro dev`. */
-  devOptions: {
+  devOptions?: {
     hostname?: string;
     /** The port to run the dev server on. */
-    port: number;
+    port?: number;
     /** Path to tailwind.config.js, if used */
     tailwindConfig?: string;
     /**
@@ -70,6 +77,20 @@ export interface AstroConfig {
      *   'ignore' - Match URLs regardless of whether a trailing "/" exists
      * Default: 'always'
      */
-    trailingSlash: 'always' | 'never' | 'ignore';
+    trailingSlash?: 'always' | 'never' | 'ignore';
   };
 }
+
+
+// NOTE(fks): We choose to keep our hand-generated AstroUserConfig interface so that
+// we can add JSDoc-style documentation and link to the definition file in our repo.
+// However, Zod comes with the ability to auto-generate AstroConfig from the schema
+// above. If we ever get to the point where we no longer need the dedicated
+// @types/config.ts file, consider replacing it with the following lines:
+//
+// export interface AstroUserConfig extends z.input<typeof AstroConfigSchema> {
+//   markdownOptions?: Partial<AstroMarkdownOptions>;
+// }
+export interface AstroConfig extends z.output<typeof AstroConfigSchema> {
+  markdownOptions: Partial<AstroMarkdownOptions>;
+}
\ No newline at end of file
diff --git a/packages/astro/src/@types/public.ts b/packages/astro/src/@types/public.ts
new file mode 100644
index 000000000..dbce2fee4
--- /dev/null
+++ b/packages/astro/src/@types/public.ts
@@ -0,0 +1 @@
+export {AstroConfig, AstroUserConfig} from './config';
\ No newline at end of file
diff --git a/packages/astro/src/build.ts b/packages/astro/src/build.ts
index 5fc32ec2e..6f60c862a 100644
--- a/packages/astro/src/build.ts
+++ b/packages/astro/src/build.ts
@@ -32,7 +32,6 @@ function isRemoteOrEmbedded(url: string) {
 /** The primary build action */
 export async function build(astroConfig: AstroConfig, logging: LogOptions = defaultLogging): Promise<0 | 1> {
   const { projectRoot } = astroConfig;
-  const dist = new URL(astroConfig.dist + '/', projectRoot);
   const buildState: BuildOutput = {};
   const depTree: BundleMap = {};
   const timer: Record<string, number> = {};
@@ -54,7 +53,7 @@ export async function build(astroConfig: AstroConfig, logging: LogOptions = defa
 
   try {
     // 0. erase build directory
-    await del(fileURLToPath(dist));
+    await del(fileURLToPath(astroConfig.dist));
 
     /**
      * 1. Build Pages
@@ -197,7 +196,7 @@ ${stack}
       timer.sitemap = performance.now();
       info(logging, 'build', yellow('! creating sitemap...'));
       const sitemap = generateSitemap(buildState, astroConfig.buildOptions.site);
-      const sitemapPath = new URL('sitemap.xml', dist);
+      const sitemapPath = new URL('sitemap.xml', astroConfig.dist);
       await fs.promises.mkdir(path.dirname(fileURLToPath(sitemapPath)), { recursive: true });
       await fs.promises.writeFile(sitemapPath, sitemap, 'utf8');
       info(logging, 'build', green('✔'), 'sitemap built.');
@@ -208,7 +207,7 @@ ${stack}
     timer.write = performance.now();
     await Promise.all(
       Object.keys(buildState).map(async (id) => {
-        const outPath = new URL(`.${id}`, dist);
+        const outPath = new URL(`.${id}`, astroConfig.dist);
         const parentDir = path.dirname(fileURLToPath(outPath));
         await fs.promises.mkdir(parentDir, { recursive: true });
         await fs.promises.writeFile(outPath, buildState[id].contents, buildState[id].encoding);
@@ -229,7 +228,7 @@ ${stack}
       await Promise.all(
         publicFiles.map(async (filepath) => {
           const srcPath = new URL(filepath, astroConfig.public);
-          const distPath = new URL(filepath, dist);
+          const distPath = new URL(filepath, astroConfig.dist);
           await fs.promises.mkdir(path.dirname(fileURLToPath(distPath)), { recursive: true });
           await fs.promises.copyFile(srcPath, distPath);
         })
@@ -249,7 +248,7 @@ ${stack}
     info(logging, 'build', yellow(`! bundling...`));
     if (jsImports.size > 0) {
       timer.bundleJS = performance.now();
-      const jsStats = await bundleJS(jsImports, { dist: new URL(dist + '/', projectRoot), astroRuntime });
+      const jsStats = await bundleJS(jsImports, { dist: astroConfig.dist, astroRuntime });
       mapBundleStatsToURLStats({ urlStats, depTree, bundleStats: jsStats });
       debug(logging, 'build', `bundled JS [${stopTimer(timer.bundleJS)}]`);
       info(logging, 'build', green(`✔`), 'bundling complete.');
diff --git a/packages/astro/src/build/page.ts b/packages/astro/src/build/page.ts
index fed683949..6708d55c0 100644
--- a/packages/astro/src/build/page.ts
+++ b/packages/astro/src/build/page.ts
@@ -45,14 +45,14 @@ export async function getStaticPathsForPage({
   };
 }
 
-function formatOutFile(path: string, pageDirectoryUrl: boolean) {
+function formatOutFile(path: string, pageUrlFormat: AstroConfig['buildOptions']['pageUrlFormat']) {
   if (path === '/404') {
     return '/404.html';
   }
   if (path === '/') {
     return '/index.html';
   }
-  if (pageDirectoryUrl) {
+  if (pageUrlFormat === 'directory') {
     return _path.posix.join(path, '/index.html');
   }
   return `${path}.html`;
@@ -68,7 +68,7 @@ export async function buildStaticPage({ astroConfig, buildState, path, route, as
     err.filename = fileURLToPath(location.fileURL);
     throw err;
   }
-  buildState[formatOutFile(path, astroConfig.buildOptions.pageDirectoryUrl)] = {
+  buildState[formatOutFile(path, astroConfig.buildOptions.pageUrlFormat)] = {
     srcPath: location.fileURL,
     contents: result.contents,
     contentType: 'text/html',
diff --git a/packages/astro/src/compiler/codegen/index.ts b/packages/astro/src/compiler/codegen/index.ts
index 09bd95b46..8fcf50768 100644
--- a/packages/astro/src/compiler/codegen/index.ts
+++ b/packages/astro/src/compiler/codegen/index.ts
@@ -1,6 +1,6 @@
 import type { Ast, Script, Style, TemplateNode, Expression } from '@astrojs/parser';
 import type { CompileOptions } from '../../@types/compiler';
-import type { AstroConfig, AstroMarkdownOptions, TransformResult, ComponentInfo, Components } from '../../@types/astro';
+import type { AstroConfig, TransformResult, ComponentInfo, Components } from '../../@types/astro';
 import type { ImportDeclaration, ExportNamedDeclaration, VariableDeclarator, Identifier, ImportDefaultSpecifier } from '@babel/types';
 import type { Attribute } from './interfaces';
 import eslexer from 'es-module-lexer';
@@ -566,7 +566,7 @@ async function compileHtml(enterNode: TemplateNode, state: CodegenState, compile
       }
       const { $scope: scopedClassName } = state.markers.insideMarkdown as Record<'$scope', any>;
       let { content: rendered } = await renderMarkdown(dedent(md), {
-        ...(markdownOptions as AstroMarkdownOptions),
+        ...markdownOptions,
         $: { scopedClassName: scopedClassName && scopedClassName.slice(1, -1) },
       });
 
diff --git a/packages/astro/src/config.ts b/packages/astro/src/config.ts
index 11e28b168..3e20559f8 100644
--- a/packages/astro/src/config.ts
+++ b/packages/astro/src/config.ts
@@ -1,108 +1,114 @@
-import type { AstroConfig } from './@types/astro';
-import path from 'path';
 import { existsSync } from 'fs';
 import getPort from 'get-port';
+import path from 'path';
+import { z } from 'zod';
+import { AstroConfig, AstroUserConfig } from './@types/astro';
+import { addTrailingSlash } from './util.js';
 
-/** Type util */
-const type = (thing: any): string => (Array.isArray(thing) ? 'Array' : typeof thing);
-
-/** Throws error if a user provided an invalid config. Manually-implemented to avoid a heavy validation library. */
-function validateConfig(config: any): void {
-  // basic
-  if (config === undefined || config === null) throw new Error(`[config] Config empty!`);
-  if (typeof config !== 'object') throw new Error(`[config] Expected object, received ${typeof config}`);
-
-  // strings
-  for (const key of ['projectRoot', 'pages', 'dist', 'public']) {
-    if (config[key] !== undefined && config[key] !== null && typeof config[key] !== 'string') {
-      throw new Error(`[config] ${key}: ${JSON.stringify(config[key])}\n  Expected string, received ${type(config[key])}.`);
-    }
-  }
-
-  // booleans
-  for (const key of ['sitemap']) {
-    if (config[key] !== undefined && config[key] !== null && typeof config[key] !== 'boolean') {
-      throw new Error(`[config] ${key}: ${JSON.stringify(config[key])}\n  Expected boolean, received ${type(config[key])}.`);
-    }
-  }
-
-  // buildOptions
-  if (config.buildOptions) {
-    // buildOptions.site
-    if (config.buildOptions.site !== undefined) {
-      if (typeof config.buildOptions.site !== 'string') throw new Error(`[config] buildOptions.site is not a string`);
-      try {
-        new URL(config.buildOptions.site);
-      } catch (err) {
-        throw new Error('[config] buildOptions.site must be a valid URL');
-      }
-    }
-  }
-
-  // devOptions
-  if (typeof config.devOptions?.port !== 'number') {
-    throw new Error(`[config] devOptions.port: Expected number, received ${type(config.devOptions?.port)}`);
-  }
-  if (typeof config.devOptions?.hostname !== 'string') {
-    throw new Error(`[config] devOptions.hostname: Expected string, received ${type(config.devOptions?.hostname)}`);
-  }
-  if (config.devOptions?.tailwindConfig !== undefined && typeof config.devOptions?.tailwindConfig !== 'string') {
-    throw new Error(`[config] devOptions.tailwindConfig: Expected string, received ${type(config.devOptions?.tailwindConfig)}`);
-  }
-}
-
-/** Set default config values */
-async function configDefaults(userConfig?: any): Promise<any> {
-  const config: any = { ...(userConfig || {}) };
-
-  if (config.projectRoot === undefined) config.projectRoot = '.';
-  if (config.src === undefined) config.src = './src';
-  if (config.pages === undefined) config.pages = './src/pages';
-  if (config.dist === undefined) config.dist = './dist';
-  if (config.public === undefined) config.public = './public';
-  if (config.devOptions === undefined) config.devOptions = {};
-  if (config.devOptions.port === undefined) config.devOptions.port = await getPort({ port: getPort.makeRange(3000, 3050) });
-  if (config.devOptions.hostname === undefined) config.devOptions.hostname = 'localhost';
-  if (config.devOptions.trailingSlash === undefined) config.devOptions.trailingSlash = 'ignore';
-  if (config.buildOptions === undefined) config.buildOptions = {};
-  if (config.buildOptions.pageDirectoryUrl === undefined) config.buildOptions.pageDirectoryUrl = true;
-  if (config.markdownOptions === undefined) config.markdownOptions = {};
-  if (config.buildOptions.sitemap === undefined) config.buildOptions.sitemap = true;
-
-  return config;
-}
+export const AstroConfigSchema = z.object({
+  projectRoot: z
+    .string()
+    .optional()
+    .default('.')
+    .transform((val) => new URL(val)),
+  src: z
+    .string()
+    .optional()
+    .default('./src')
+    .transform((val) => new URL(val)),
+  pages: z
+    .string()
+    .optional()
+    .default('./src/pages')
+    .transform((val) => new URL(val)),
+  public: z
+    .string()
+    .optional()
+    .default('./public')
+    .transform((val) => new URL(val)),
+  dist: z
+    .string()
+    .optional()
+    .default('./dist')
+    .transform((val) => new URL(val)),
+  renderers: z.array(z.string()).optional().default(['@astrojs/renderer-svelte', '@astrojs/renderer-vue', '@astrojs/renderer-react', '@astrojs/renderer-preact']),
+  markdownOptions: z
+    .object({
+      footnotes: z.boolean().optional(),
+      gfm: z.boolean().optional(),
+      remarkPlugins: z.array(z.any()).optional(),
+      rehypePlugins: z.array(z.any()).optional(),
+    })
+    .optional()
+    .default({}),
+  buildOptions: z
+    .object({
+      site: z.string().optional(),
+      sitemap: z.boolean().optional().default(true),
+      pageUrlFormat: z
+        .union([z.literal('file'), z.literal('directory')])
+        .optional()
+        .default('directory'),
+    })
+    .optional()
+    .default({}),
+  devOptions: z
+    .object({
+      hostname: z.string().optional().default('localhost'),
+      port: z
+        .number()
+        .optional()
+        .transform((val) => val || getPort({ port: getPort.makeRange(3000, 3050) })),
+      tailwindConfig: z.string().optional(),
+      trailingSlash: z
+        .union([z.literal('always'), z.literal('never'), z.literal('ignore')])
+        .optional()
+        .default('ignore'),
+    })
+    .optional()
+    .default({}),
+});
 
 /** Turn raw config values into normalized values */
-function normalizeConfig(userConfig: any, root: string): AstroConfig {
-  const config: any = { ...(userConfig || {}) };
-
+async function validateConfig(userConfig: any, root: string): Promise<AstroConfig> {
   const fileProtocolRoot = `file://${root}/`;
-  config.projectRoot = new URL(config.projectRoot + '/', fileProtocolRoot);
-  config.src = new URL(config.src + '/', fileProtocolRoot);
-  config.pages = new URL(config.pages + '/', fileProtocolRoot);
-  config.public = new URL(config.public + '/', fileProtocolRoot);
-
-  return config as AstroConfig;
+  // We need to extend the global schema to add transforms that are relative to root.
+  // This is type checked against the global schema to make sure we still match.
+  const AstroConfigRelativeSchema = AstroConfigSchema.extend({
+    projectRoot: z
+      .string()
+      .default('.')
+      .transform((val) => new URL(addTrailingSlash(val), fileProtocolRoot)),
+    src: z
+      .string()
+      .default('./src')
+      .transform((val) => new URL(addTrailingSlash(val), fileProtocolRoot)),
+    pages: z
+      .string()
+      .default('./src/pages')
+      .transform((val) => new URL(addTrailingSlash(val), fileProtocolRoot)),
+    public: z
+      .string()
+      .default('./public')
+      .transform((val) => new URL(addTrailingSlash(val), fileProtocolRoot)),
+    dist: z
+      .string()
+      .default('./dist')
+      .transform((val) => new URL(addTrailingSlash(val), fileProtocolRoot)),
+  });
+  return AstroConfigRelativeSchema.parseAsync(userConfig);
 }
 
 /** Attempt to load an `astro.config.mjs` file */
 export async function loadConfig(rawRoot: string | undefined, configFileName = 'astro.config.mjs'): Promise<AstroConfig> {
   const root = rawRoot ? path.resolve(rawRoot) : process.cwd();
   const astroConfigPath = new URL(`./${configFileName}`, `file://${root}/`);
-
-  // load
-  let config: any;
+  let userConfig: AstroUserConfig = {};
+  // Load a user-config, if one exists and is provided
   if (existsSync(astroConfigPath)) {
-    config = await configDefaults((await import(astroConfigPath.href)).default);
-  } else {
-    config = await configDefaults();
+    userConfig = (await import(astroConfigPath.href)).default;
   }
-
-  // validate
-  validateConfig(config);
-
-  // normalize
-  config = normalizeConfig(config, root);
-
-  return config as AstroConfig;
+  // normalize, validate, and return
+  const config = await validateConfig(userConfig, root);
+  return config;
 }
diff --git a/packages/astro/src/runtime.ts b/packages/astro/src/runtime.ts
index e585511d2..cf69b4aa1 100644
--- a/packages/astro/src/runtime.ts
+++ b/packages/astro/src/runtime.ts
@@ -351,7 +351,7 @@ async function createSnowpack(astroConfig: AstroConfig, options: CreateSnowpackO
     },
     buildOptions: {
       baseUrl: astroConfig.buildOptions.site || '/', // note: Snowpack needs this fallback
-      out: astroConfig.dist,
+      out: fileURLToPath(astroConfig.dist),
     },
     packageOptions: {
       knownEntrypoints,
diff --git a/packages/astro/src/util.ts b/packages/astro/src/util.ts
index 249f7eb43..92f59acdd 100644
--- a/packages/astro/src/util.ts
+++ b/packages/astro/src/util.ts
@@ -43,3 +43,14 @@ export function validateGetStaticPathsResult(result: GetStaticPathsResult, loggi
     }
   });
 }
+
+
+/** Add / to beginning of string (but don’t double-up) */
+export function addLeadingSlash(path: string) {
+  return path.replace(/^\/?/, '/');
+}
+
+/** Add / to the end of string (but don’t double-up) */
+export function addTrailingSlash(path: string) {
+  return path.replace(/\/?$/, '/');
+}
\ No newline at end of file
diff --git a/packages/astro/test/astro-pageDirectoryUrl.test.js b/packages/astro/test/astro-pageDirectoryUrl.test.js
index 0dde1286f..dc11f0670 100644
--- a/packages/astro/test/astro-pageDirectoryUrl.test.js
+++ b/packages/astro/test/astro-pageDirectoryUrl.test.js
@@ -2,7 +2,7 @@ import { suite } from 'uvu';
 import * as assert from 'uvu/assert';
 import { setupBuild } from './helpers.js';
 
-const PageDirectoryUrl = suite('pageDirectoryUrl');
+const PageDirectoryUrl = suite('pageUrlFormat');
 
 setupBuild(PageDirectoryUrl, './fixtures/astro-page-directory-url');
 
diff --git a/packages/astro/test/fixtures/astro-page-directory-url/astro.config.mjs b/packages/astro/test/fixtures/astro-page-directory-url/astro.config.mjs
index 995a3dc46..309bb9d5a 100644
--- a/packages/astro/test/fixtures/astro-page-directory-url/astro.config.mjs
+++ b/packages/astro/test/fixtures/astro-page-directory-url/astro.config.mjs
@@ -1,5 +1,5 @@
 export default {
   buildOptions: {
-    pageDirectoryUrl: false
+    pageUrlFormat: 'file'
   }
 };
diff --git a/packages/astro/test/helpers.js b/packages/astro/test/helpers.js
index 411cd7677..e579c5ed3 100644
--- a/packages/astro/test/helpers.js
+++ b/packages/astro/test/helpers.js
@@ -85,7 +85,7 @@ export function setupBuild(Suite, fixturePath) {
 
     context.build = () => astroBuild(astroConfig, { level: 'error' });
     context.readFile = async (path) => {
-      const resolved = fileURLToPath(new URL(`${fixturePath}/${astroConfig.dist}${path}`, import.meta.url));
+      const resolved = fileURLToPath(new URL(path.replace(/^\//, ''), astroConfig.dist));
       return readFileSync(resolved, { encoding: 'utf8' });
     };
 
diff --git a/yarn.lock b/yarn.lock
index 186782397..6318e09bc 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -10989,6 +10989,11 @@ zepto@^1.2.0:
   resolved "https://registry.yarnpkg.com/zepto/-/zepto-1.2.0.tgz#e127bd9e66fd846be5eab48c1394882f7c0e4f98"
   integrity sha1-4Se9nmb9hGvl6rSME5SIL3wOT5g=
 
+zod@^3.8.1:
+  version "3.8.1"
+  resolved "https://registry.yarnpkg.com/zod/-/zod-3.8.1.tgz#b1173c3b4ac2a9e06d302ff580e3b41902766b9f"
+  integrity sha512-u4Uodl7dLh8nXZwqXL1SM5FAl5b4lXYHOxMUVb9lqhlEAZhA2znX+0oW480m0emGFMxpoRHzUncAqRkc4h8ZJA==
+
 zwitch@^1.0.0:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/zwitch/-/zwitch-1.0.5.tgz#d11d7381ffed16b742f6af7b3f223d5cd9fe9920"