Reproduction - Cloudflare adapter hangs process using Vitest

.github/workflows/hanging-process.yml

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+# This is a GitHub Actions workflow file that runs the vitest-hanging-process
+# tests in various nodejs versions.
+
+name: hanging-process
+
+on:
+  workflow_dispatch:
+  pull_request:
+
+jobs:
+  test:
+    name: Test on Node.js Version ${{ matrix.node-version }}
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: packages/vitest-hanging-process
+
+    strategy:
+      matrix:
+        node-version: [18, 19, 20, 21, 22, 23]
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Setup PNPM
+        uses: pnpm/action-setup@v3
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Build package/cloudflare
+        working-directory: packages/cloudflare
+        run: pnpm build
+
+      - name: Run tests for hanging process
+        run: pnpm test:hanging-process

.tool-versions

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+pnpm 9.13.2
+act 0.2.69
+just 1.36.0

justfile

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+default:
+    @just --choose
+
+test-workflow:
+    act --workflows .github/workflows/hanging-process.yml

packages/vitest-hanging-process/.gitignore

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+# build output
+dist/
+# generated types
+.astro/
+
+# dependencies
+node_modules/
+
+# logs
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+
+# environment variables
+.env
+.env.production
+
+# macOS-specific files
+.DS_Store
+
+# jetbrains setting folder
+.idea/

packages/vitest-hanging-process/.tool-versions

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+act 0.2.69

packages/vitest-hanging-process/.vscode/extensions.json

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+{
+  "recommendations": ["astro-build.astro-vscode"],
+  "unwantedRecommendations": []
+}

packages/vitest-hanging-process/.vscode/launch.json

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+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "command": "./node_modules/.bin/astro dev",
+      "name": "Development server",
+      "request": "launch",
+      "type": "node-terminal"
+    }
+  ]
+}

packages/vitest-hanging-process/README.md

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+# Astro Starter Kit: Minimal
+
+```sh
+npm create astro@latest -- --template minimal
+```
+
+[![Open in StackBlitz](https://developer.stackblitz.com/img/open_in_stackblitz.svg)](https://stackblitz.com/github/withastro/astro/tree/latest/examples/minimal)
+[![Open with CodeSandbox](https://assets.codesandbox.io/github/button-edit-lime.svg)](https://codesandbox.io/p/sandbox/github/withastro/astro/tree/latest/examples/minimal)
+[![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://codespaces.new/withastro/astro?devcontainer_path=.devcontainer/minimal/devcontainer.json)
+
+> 🧑‍🚀 **Seasoned astronaut?** Delete this file. Have fun!
+
+## 🚀 Project Structure
+
+Inside of your Astro project, you'll see the following folders and files:
+
+```text
+/
+├── public/
+├── src/
+│   └── pages/
+│       └── index.astro
+└── package.json
+```
+
+Astro looks for `.astro` or `.md` files in the `src/pages/` directory. Each page is exposed as a route based on its file name.
+
+There's nothing special about `src/components/`, but that's where we like to put any Astro/React/Vue/Svelte/Preact components.
+
+Any static assets, like images, can be placed in the `public/` directory.
+
+## 🧞 Commands
+
+All commands are run from the root of the project, from a terminal:
+
+| Command                   | Action                                           |
+| :------------------------ | :----------------------------------------------- |
+| `npm install`             | Installs dependencies                            |
+| `npm run dev`             | Starts local dev server at `localhost:4321`      |
+| `npm run build`           | Build your production site to `./dist/`          |
+| `npm run preview`         | Preview your build locally, before deploying     |
+| `npm run astro ...`       | Run CLI commands like `astro add`, `astro check` |
+| `npm run astro -- --help` | Get help using the Astro CLI                     |
+
+## 👀 Want to learn more?
+
+Feel free to check [our documentation](https://docs.astro.build) or jump into our [Discord server](https://astro.build/chat).

packages/vitest-hanging-process/astro.config.mjs

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+// @ts-check
+import { defineConfig } from 'astro/config';
+
+import cloudflare from '@astrojs/cloudflare';
+
+// https://astro.build/config
+export default defineConfig({
+  output: 'server',
+  adapter: cloudflare()
+});

packages/vitest-hanging-process/package.json

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+{
+  "name": "Astro Vitest with Cloudflare adapter hanging process",
+  "type": "module",
+  "version": "0.0.1",
+  "scripts": {
+    "dev": "astro dev",
+    "start": "astro dev",
+    "build": "astro check && astro build",
+    "preview": "astro preview",
+    "astro": "astro",
+    "test": "vitest run",
+    "test:hanging-process": "vitest run --reporter=hanging-process"
+  },
+  "dependencies": {
+    "@astrojs/check": "^0.9.4",
+    "@astrojs/cloudflare": "workspace:^11.2.0",
+    "astro": "^4.16.12",
+    "typescript": "^5.6.3"
+  },
+  "devDependencies": {
+    "vitest": "^2.1.5"
+  }
+}

packages/vitest-hanging-process/src/env.d.ts

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+/// <reference path="../.astro/types.d.ts" />

packages/vitest-hanging-process/src/pages/index.astro

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+---
+
+---
+
+<html lang="en">
+	<head>
+		<meta charset="utf-8" />
+		<link rel="icon" type="image/svg+xml" href="/favicon.svg" />
+		<meta name="viewport" content="width=device-width" />
+		<meta name="generator" content={Astro.generator} />
+		<title>Astro</title>
+	</head>
+	<body>
+		<h1>Astro</h1>
+	</body>
+</html>

packages/vitest-hanging-process/tsconfig.json

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+{
+  "extends": "astro/tsconfigs/strict"
+}

packages/vitest-hanging-process/vitest.config.ts

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+/// <reference types="vitest" />
+import { getViteConfig } from 'astro/config';
+
+export default getViteConfig({
+  test: {
+    // Vitest configuration options
+  },
+});