diff --git a/.changeset/silent-dragons-sell.md b/.changeset/silent-dragons-sell.md
new file mode 100644
index 000000000000..233d99a9696a
--- /dev/null
+++ b/.changeset/silent-dragons-sell.md
@@ -0,0 +1,6 @@
+---
+'@astrojs/netlify': patch
+'astro': patch
+---
+
+Fix polyfills not being available in certain cases
diff --git a/packages/astro/src/core/create-vite.ts b/packages/astro/src/core/create-vite.ts
index 9708466c9215..03b0ee5d1f70 100644
--- a/packages/astro/src/core/create-vite.ts
+++ b/packages/astro/src/core/create-vite.ts
@@ -55,6 +55,12 @@ export async function createVite(
 		isBuild: mode === 'build',
 		viteUserConfig: settings.config.vite,
 		isFrameworkPkgByJson(pkgJson) {
+			// Certain packages will trigger the checks below, but need to be external. A common example are SSR adapters
+			// for node-based platforms, as we need to control the order of the import paths to make sure polyfills are applied in time.
+			if (pkgJson?.astro?.external === true) {
+				return false;
+			}
+
 			return (
 				// Attempt: package relies on `astro`. ✅ Definitely an Astro package
 				pkgJson.peerDependencies?.astro ||
diff --git a/packages/integrations/netlify/package.json b/packages/integrations/netlify/package.json
index 25695ea79181..33caf0f62004 100644
--- a/packages/integrations/netlify/package.json
+++ b/packages/integrations/netlify/package.json
@@ -50,5 +50,8 @@
     "cheerio": "^1.0.0-rc.11",
     "mocha": "^9.2.2",
     "vite": "^4.0.3"
+  },
+  "astro": {
+    "external": true
   }
 }