code · pull · Jan 29, 2026 · Jan 29, 2026 · Jan 29, 2026
diff --git a/examples/basics/package.json b/examples/basics/package.json
@@ -10,6 +10,6 @@
     "astro": "astro"
   },
   "dependencies": {
-    "astro": "^5.17.0"
+    "astro": "^5.17.1"
   }
 }
diff --git a/examples/blog/package.json b/examples/blog/package.json
@@ -13,7 +13,7 @@
     "@astrojs/mdx": "^4.3.13",
     "@astrojs/rss": "^4.0.15",
     "@astrojs/sitemap": "^3.7.0",
-    "astro": "^5.17.0",
+    "astro": "^5.17.1",
     "sharp": "^0.34.3"
   }
 }
diff --git a/examples/component/package.json b/examples/component/package.json
@@ -15,7 +15,7 @@
   ],
   "scripts": {},
   "devDependencies": {
-    "astro": "^5.17.0"
+    "astro": "^5.17.1"
   },
   "peerDependencies": {
     "astro": "^4.0.0 || ^5.0.0"

diff --git a/examples/container-with-vitest/package.json b/examples/container-with-vitest/package.json
@@ -12,7 +12,7 @@
   },
   "dependencies": {
     "@astrojs/react": "^4.4.2",
-    "astro": "^5.17.0",
+    "astro": "^5.17.1",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "vitest": "^3.2.4"

diff --git a/examples/framework-alpine/package.json b/examples/framework-alpine/package.json
@@ -13,6 +13,6 @@
     "@astrojs/alpinejs": "^0.4.9",
     "@types/alpinejs": "^3.13.11",
     "alpinejs": "^3.15.4",
-    "astro": "^5.17.0"
+    "astro": "^5.17.1"
   }
 }
diff --git a/examples/framework-multiple/package.json b/examples/framework-multiple/package.json
@@ -17,7 +17,7 @@
     "@astrojs/vue": "^5.1.4",
     "@types/react": "^18.3.27",
     "@types/react-dom": "^18.3.7",
-    "astro": "^5.17.0",
+    "astro": "^5.17.1",
     "preact": "^10.28.2",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",

diff --git a/examples/framework-preact/package.json b/examples/framework-preact/package.json
@@ -12,7 +12,7 @@
   "dependencies": {
     "@astrojs/preact": "^4.1.3",
     "@preact/signals": "^2.5.1",
-    "astro": "^5.17.0",
+    "astro": "^5.17.1",
     "preact": "^10.28.2"
   }
 }
diff --git a/examples/framework-react/package.json b/examples/framework-react/package.json
@@ -13,7 +13,7 @@
     "@astrojs/react": "^4.4.2",
     "@types/react": "^18.3.27",
     "@types/react-dom": "^18.3.7",
-    "astro": "^5.17.0",
+    "astro": "^5.17.1",
     "react": "^18.3.1",
     "react-dom": "^18.3.1"
   }

diff --git a/examples/framework-solid/package.json b/examples/framework-solid/package.json
@@ -11,7 +11,7 @@
   },
   "dependencies": {
     "@astrojs/solid-js": "^5.1.3",
-    "astro": "^5.17.0",
+    "astro": "^5.17.1",
     "solid-js": "^1.9.10"
   }
 }
diff --git a/examples/framework-svelte/package.json b/examples/framework-svelte/package.json
@@ -11,7 +11,7 @@
   },
   "dependencies": {
     "@astrojs/svelte": "^7.2.5",
-    "astro": "^5.17.0",
+    "astro": "^5.17.1",
     "svelte": "^5.46.1"
   }
 }
diff --git a/examples/framework-vue/package.json b/examples/framework-vue/package.json
@@ -11,7 +11,7 @@
   },
   "dependencies": {
     "@astrojs/vue": "^5.1.4",
-    "astro": "^5.17.0",
+    "astro": "^5.17.1",
     "vue": "^3.5.26"
   }
 }
diff --git a/examples/hackernews/package.json b/examples/hackernews/package.json
@@ -11,6 +11,6 @@
   },
   "dependencies": {
     "@astrojs/node": "^9.5.2",
-    "astro": "^5.17.0"
+    "astro": "^5.17.1"
   }
 }
diff --git a/examples/integration/package.json b/examples/integration/package.json
@@ -15,7 +15,7 @@
   ],
   "scripts": {},
   "devDependencies": {
-    "astro": "^5.17.0"
+    "astro": "^5.17.1"
   },
   "peerDependencies": {
     "astro": "^4.0.0"

diff --git a/examples/minimal/package.json b/examples/minimal/package.json
@@ -10,6 +10,6 @@
     "astro": "astro"
   },
   "dependencies": {
-    "astro": "^5.17.0"
+    "astro": "^5.17.1"
   }
 }
diff --git a/examples/portfolio/package.json b/examples/portfolio/package.json
@@ -10,6 +10,6 @@
     "astro": "astro"
   },
   "dependencies": {
-    "astro": "^5.17.0"
+    "astro": "^5.17.1"
   }
 }
diff --git a/examples/ssr/package.json b/examples/ssr/package.json
@@ -13,7 +13,7 @@
   "dependencies": {
     "@astrojs/node": "^9.5.2",
     "@astrojs/svelte": "^7.2.5",
-    "astro": "^5.17.0",
+    "astro": "^5.17.1",
     "svelte": "^5.46.1"
   }
 }
diff --git a/examples/starlog/package.json b/examples/starlog/package.json
@@ -9,7 +9,7 @@
     "astro": "astro"
   },
   "dependencies": {
-    "astro": "^5.17.0",
+    "astro": "^5.17.1",
     "sass": "^1.97.2",
     "sharp": "^0.34.3"
   }

diff --git a/examples/toolbar-app/package.json b/examples/toolbar-app/package.json
@@ -16,6 +16,6 @@
   },
   "devDependencies": {
     "@types/node": "^18.17.8",
-    "astro": "^5.17.0"
+    "astro": "^5.17.1"
   }
 }
diff --git a/examples/with-markdoc/package.json b/examples/with-markdoc/package.json
@@ -11,6 +11,6 @@
   },
   "dependencies": {
     "@astrojs/markdoc": "^0.15.10",
-    "astro": "^5.17.0"
+    "astro": "^5.17.1"
   }
 }
diff --git a/examples/with-mdx/package.json b/examples/with-mdx/package.json
@@ -12,7 +12,7 @@
   "dependencies": {
     "@astrojs/mdx": "^4.3.13",
     "@astrojs/preact": "^4.1.3",
-    "astro": "^5.17.0",
+    "astro": "^5.17.1",
     "preact": "^10.28.2"
   }
 }
diff --git a/examples/with-nanostores/package.json b/examples/with-nanostores/package.json
@@ -12,7 +12,7 @@
   "dependencies": {
     "@astrojs/preact": "^4.1.3",
     "@nanostores/preact": "^0.5.2",
-    "astro": "^5.17.0",
+    "astro": "^5.17.1",
     "nanostores": "^0.11.4",
     "preact": "^10.28.2"
   }

diff --git a/examples/with-tailwindcss/package.json b/examples/with-tailwindcss/package.json
@@ -13,7 +13,7 @@
     "@astrojs/mdx": "^4.3.13",
     "@tailwindcss/vite": "^4.1.18",
     "@types/canvas-confetti": "^1.9.0",
-    "astro": "^5.17.0",
+    "astro": "^5.17.1",
     "canvas-confetti": "^1.9.4",
     "tailwindcss": "^4.1.18"
   }

diff --git a/examples/with-vitest/package.json b/examples/with-vitest/package.json
@@ -11,7 +11,7 @@
     "test": "vitest"
   },
   "dependencies": {
-    "astro": "^5.17.0",
+    "astro": "^5.17.1",
     "vitest": "^3.2.4"
   }
 }
diff --git a/packages/astro/CHANGELOG.md b/packages/astro/CHANGELOG.md
@@ -1,5 +1,19 @@
 # astro
 
+## 5.17.1
+
+### Patch Changes
+
+- [#15334](https://github.com/withastro/astro/pull/15334) [`d715f1f`](https://github.com/withastro/astro/commit/d715f1f88777a4ce0fb61c8043cccfbac2486ab4) Thanks [@florian-lefebvre](https://github.com/florian-lefebvre)! - **BREAKING CHANGE to the experimental Fonts API only**
+
+  Removes the `getFontBuffer()` helper function exported from `astro:assets` when using the experimental Fonts API
+
+  This experimental feature introduced in v15.6.13 ended up causing significant memory usage during build. This feature has been removed and will be reintroduced after further exploration and testing.
+
+  If you were relying on this function, you can replicate the previous behavior manually:
+  - On prerendered routes, read the file using `node:fs`
+  - On server rendered routes, fetch files using URLs from `fontData` and `context.url`
+
 ## 5.17.0
 
 ### Minor Changes

diff --git a/packages/astro/client.d.ts b/packages/astro/client.d.ts
@@ -55,7 +55,6 @@ declare module 'astro:assets' {
 		Picture: typeof import('./components/Picture.astro').default;
 		Font: typeof import('./components/Font.astro').default;
 		fontData: Record<import('astro:assets').CssVariable, Array<import('astro:assets').FontData>>;
-		getFontBuffer: (url: string) => Promise<Buffer>;
 	};
 
 	type ImgAttributes = import('./dist/type-utils.js').WithRequired<
@@ -78,7 +77,6 @@ declare module 'astro:assets' {
 		Font,
 		inferRemoteSize,
 		fontData,
-		getFontBuffer,
 	}: AstroAssets;
 }
 

diff --git a/packages/astro/dev-only.d.ts b/packages/astro/dev-only.d.ts
@@ -9,7 +9,6 @@ declare module 'virtual:astro:env/internal' {
 declare module 'virtual:astro:assets/fonts/internal' {
 	export const componentDataByCssVariable: import('./src/assets/fonts/types.js').ComponentDataByCssVariable;
 	export const fontDataByCssVariable: import('./src/assets/fonts/types.js').FontDataByCssVariable;
-	export const bufferImports: import('./src/assets/fonts/types.js').BufferImports;
 }
 
 declare module 'virtual:astro:adapter-config/client' {

diff --git a/packages/astro/package.json b/packages/astro/package.json
@@ -1,6 +1,6 @@
 {
   "name": "astro",
-  "version": "5.17.0",
+  "version": "5.17.1",
   "description": "Astro is a modern site builder with web best practices, performance, and DX front-of-mind.",
   "type": "module",
   "author": "withastro",
@@ -63,8 +63,7 @@
     "./assets/endpoint/*": "./dist/assets/endpoint/*.js",
     "./assets/services/sharp": "./dist/assets/services/sharp.js",
     "./assets/services/noop": "./dist/assets/services/noop.js",
-    "./assets/fonts/runtime/server.js": "./dist/assets/fonts/runtime/server.js",
-    "./assets/fonts/runtime/client.js": "./dist/assets/fonts/runtime/client.js",
+    "./assets/fonts/runtime.js": "./dist/assets/fonts/runtime.js",
     "./loaders": "./dist/content/loaders/index.js",
     "./content/config": "./dist/content/config.js",
     "./content/runtime": "./dist/content/runtime.js",

diff --git a/packages/astro/src/assets/fonts/constants.ts b/packages/astro/src/assets/fonts/constants.ts
@@ -16,9 +16,6 @@ export const RESOLVED_VIRTUAL_MODULE_ID = '\0' + VIRTUAL_MODULE_ID;
 export const RUNTIME_VIRTUAL_MODULE_ID = 'virtual:astro:assets/fonts/runtime';
 export const RESOLVED_RUNTIME_VIRTUAL_MODULE_ID = '\0' + RUNTIME_VIRTUAL_MODULE_ID;
 
-export const BUFFER_VIRTUAL_MODULE_ID_PREFIX = 'virtual:astro:assets/fonts/file/';
-export const RESOLVED_BUFFER_VIRTUAL_MODULE_ID_PREFIX = '\0' + BUFFER_VIRTUAL_MODULE_ID_PREFIX;
-
 export const ASSETS_DIR = 'fonts';
 export const CACHE_DIR = './fonts/';
 

diff --git a/packages/astro/src/assets/fonts/core/create-get-font-buffer.ts b/packages/astro/src/assets/fonts/core/create-get-font-buffer.ts
diff --git a/.../astro/src/assets/fonts/runtime/client.ts → packages/astro/src/assets/fonts/runtime.ts b/.../astro/src/assets/fonts/runtime/client.ts → packages/astro/src/assets/fonts/runtime.ts
@@ -2,7 +2,3 @@ import * as fontsMod from 'virtual:astro:assets/fonts/internal';
 
 // TODO: remove default when stabilizing
 export const fontData = fontsMod.fontDataByCssVariable ?? {};
-
-export async function getFontBuffer() {
-	throw new Error('[astro:assets] `getFontBuffer()` is not available on the client.');
-}
diff --git a/packages/astro/src/assets/fonts/runtime/server.ts b/packages/astro/src/assets/fonts/runtime/server.ts
diff --git a/packages/astro/src/assets/fonts/types.ts b/packages/astro/src/assets/fonts/types.ts
@@ -272,5 +272,3 @@ export type FontFamilyAssetsByUniqueKey = Map<string, FontFamilyAssets>;
 export type Collaborator<T extends (input: any) => any, U extends keyof Parameters<T>[0]> = (
 	params: Pick<Parameters<T>[0], U>,
 ) => ReturnType<T>;
-
-export type BufferImports = Record<string, () => Promise<{ default: Buffer | null }>>;