diff --git a/.changeset/spotty-islands-raise.md b/.changeset/spotty-islands-raise.md
new file mode 100644
index 0000000000000..f8246006de127
--- /dev/null
+++ b/.changeset/spotty-islands-raise.md
@@ -0,0 +1,6 @@
+---
+'@astrojs/deno': patch
+'@astrojs/netlify': patch
+---
+
+Fix: append shim to top of built file to avoid "can't read process of undefined" issues
diff --git a/packages/integrations/deno/src/index.ts b/packages/integrations/deno/src/index.ts
index 0dad8e8ef9ab5..a104ba863c85c 100644
--- a/packages/integrations/deno/src/index.ts
+++ b/packages/integrations/deno/src/index.ts
@@ -9,6 +9,11 @@ interface Options {
 	hostname?: string;
 }
 
+const SHIM = `globalThis.process = {
+	argv: [],
+	env: Deno.env.toObject(),
+};`
+
 export function getAdapter(args?: Options): AstroAdapter {
 	return {
 		name: '@astrojs/deno',
@@ -63,6 +68,9 @@ export default function createIntegration(args?: Options): AstroIntegration {
 					format: 'esm',
 					bundle: true,
 					external: ['@astrojs/markdown-remark'],
+					banner: {
+						js: SHIM,
+					}
 				});
 
 				// Remove chunks, if they exist. Since we have bundled via esbuild these chunks are trash.
diff --git a/packages/integrations/deno/src/server.ts b/packages/integrations/deno/src/server.ts
index 9d2fc98a9c89c..f6dbcb62c4b7f 100644
--- a/packages/integrations/deno/src/server.ts
+++ b/packages/integrations/deno/src/server.ts
@@ -1,8 +1,3 @@
-// NOTE(fks): Side-effect -- shim.js must run first. This isn't guaranteed by
-// the language, but it is a Node.js behavior that we rely on here. Keep this
-// separate from the other imports so that it doesn't get organized & reordered.
-import './shim.js';
-
 // Normal Imports
 import type { SSRManifest } from 'astro';
 import { App } from 'astro/app';
diff --git a/packages/integrations/deno/src/shim.ts b/packages/integrations/deno/src/shim.ts
deleted file mode 100644
index 62e82ba30300c..0000000000000
--- a/packages/integrations/deno/src/shim.ts
+++ /dev/null
@@ -1,5 +0,0 @@
-(globalThis as any).process = {
-	argv: [],
-	// @ts-ignore
-	env: Deno.env.toObject(),
-};
diff --git a/packages/integrations/netlify/src/edge-shim.ts b/packages/integrations/netlify/src/edge-shim.ts
deleted file mode 100644
index 1a4a6ee9be4c5..0000000000000
--- a/packages/integrations/netlify/src/edge-shim.ts
+++ /dev/null
@@ -1,4 +0,0 @@
-(globalThis as any).process = {
-	argv: [],
-	env: {},
-};
diff --git a/packages/integrations/netlify/src/integration-edge-functions.ts b/packages/integrations/netlify/src/integration-edge-functions.ts
index 72788abaf348c..17eaf8350f825 100644
--- a/packages/integrations/netlify/src/integration-edge-functions.ts
+++ b/packages/integrations/netlify/src/integration-edge-functions.ts
@@ -6,6 +6,11 @@ import { fileURLToPath } from 'url';
 import type { Plugin as VitePlugin } from 'vite';
 import { createRedirects } from './shared.js';
 
+const SHIM = `globalThis.process = {
+	argv: [],
+	env: {},
+};`;
+
 export function getAdapter(): AstroAdapter {
 	return {
 		name: '@astrojs/netlify/edge-functions',
@@ -78,6 +83,9 @@ async function bundleServerEntry(buildConfig: BuildConfig, vite: any) {
 		format: 'esm',
 		bundle: true,
 		external: ['@astrojs/markdown-remark'],
+		banner: {
+			js: SHIM,
+		}
 	});
 
 	// Remove chunks, if they exist. Since we have bundled via esbuild these chunks are trash.
diff --git a/packages/integrations/netlify/src/netlify-edge-functions.ts b/packages/integrations/netlify/src/netlify-edge-functions.ts
index 8d3ecf1079f27..0d2974c61d5cd 100644
--- a/packages/integrations/netlify/src/netlify-edge-functions.ts
+++ b/packages/integrations/netlify/src/netlify-edge-functions.ts
@@ -1,6 +1,5 @@
 import type { SSRManifest } from 'astro';
 import { App } from 'astro/app';
-import './edge-shim.js';
 
 export function createExports(manifest: SSRManifest) {
 	const app = new App(manifest);