Astro Info

Astro                    v6.0.8
Node                     v25.2.1
System                   macOS (arm64)
Package Manager          unknown
Output                   server
Adapter                  @astrojs/cloudflare
Integrations             @astrojs/sitemap

If this issue only occurs in one browser, which browser is a problem?

No response

Describe the Bug

Environment

Config: output: 'server', adapter: cloudflare()

Error

require_dist is not a function
TypeError: require_dist is not a function
    at null.<anonymous> (.vite/deps_ssr/logging-C3Ufh6FJ.js:15:19)
    at CustomModuleRunner.directRequest (workers/runner-worker/vite/module-runner:1204:59)
    at null.<anonymous> (.vite/deps_ssr/astro_app_entrypoint_dev.js:17:1)
    at CustomModuleRunner.directRequest (workers/runner-worker/vite/module-runner:1204:59)
    at null.<anonymous> (/virtual:astro:app:1:1)

Crashes on both astro dev and astro build. No routes are ever served.

Traced Root Cause

1. Astro's cookies.js imports cookie as ESM

// node_modules/astro/dist/core/cookies/cookies.js
import { parse, serialize } from "cookie";

2. cookie@1.1.1 ships CJS only

No ESM export, no "type": "module", no exports map. "main": "dist/index.js" points to:

// node_modules/cookie/dist/index.js
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.parseCookie = parseCookie;
// ...

3. Rolldown wraps it with a __commonJSMin shim in .vite/deps_ssr/

// .vite/deps_ssr/chunk-DOseaPKx.js  (rolldown/runtime.js)
var __commonJSMin = (cb, mod) => () => (mod || cb((mod = { exports: {} }).exports, mod), mod.exports);

// .vite/deps_ssr/astro___cookie.js
import { t as __commonJSMin } from "./chunk-DOseaPKx.js";
var require_dist = /* @__PURE__ */ __commonJSMin(/* full cookie CJS body */);
export { require_dist as t };

require_dist is a lazy initializer — calling require_dist() runs the CJS module and returns its exports.

4. The crash in logging-C3Ufh6FJ.js

// .vite/deps_ssr/logging-C3Ufh6FJ.js
import { t as require_dist } from "./astro___cookie.js";  // line 10
// ...
var import_dist = require_dist();  // line 15 ← TypeError: require_dist is not a function

In Node.js this works fine. In workerd's CustomModuleRunner, the live binding resolves to undefined — meaning astro___cookie.js has not finished initializing its exports when line 15 executes.

5. Compounding factor — two Vite versions in the tree

astro@6.0.8 depends on Vite 7.3.1. @cloudflare/vite-plugin@1.30.0 depends on Vite 8.0.1. These are not deduped — both are installed simultaneously. The SSR pre-bundled deps in .vite/deps_ssr/ are produced by one Vite version's pipeline and then executed by the CustomModuleRunner from the other. This version split is a likely contributor to the binding timing issue.

├─┬ @astrojs/cloudflare@13.1.3
│ ├─┬ @cloudflare/vite-plugin@1.30.0
│ │ └── vite@8.0.1 deduped
│ └── vite@7.3.1
├─┬ @tailwindcss/vite@4.2.2
│ └─┬ vite@8.0.1
│   └── rolldown@1.0.0-rc.10
└─┬ astro@6.0.8
  └── vite@7.3.1

What Was Tried

Adding cookie to optimizeDeps.include via a configEnvironment Vite plugin (as recommended in the Cloudflare v13 upgrade docs) does not help. The module is part of Astro's own internal SSR entrypoint bundle — it is not an app-level dependency that can be targeted by optimizeDeps.

Suggested Fix Directions

1. Astro ships an ESM-native cookie import in its SSR output, eliminating the __commonJSMin shim entirely.
2. CustomModuleRunner binding initialization — @cloudflare/vite-plugin's module runner should fully initialize all module bindings before executing dependents, matching Node.js ESM live-binding semantics.
3. Resolve the Vite 7/8 version split — Astro and @cloudflare/vite-plugin should share one Vite instance so the dep-bundling pipeline and module runner operate on the same version.

References

• Astro v6 upgrade guide
• Cloudflare adapter v13 upgrade guide
• Related open issues in withastro/astro (Cloudflare v13 / Astro 6 area, found during search):
  • @astrojs/cloudflare workerd prerender + @sentry/astro logs "addEventListener(): useCapture must be false" and writes empty prerendered HTML #15923 — workerd prerender + @sentry/astro writes empty prerendered HTML
  • @astrojs/cloudflare v13 ignores imageService: 'compile' in dev mode, causes Cannot read properties of undefined (reading 'fetch') #15970 — Cloudflare v13 ignores imageService: 'compile' in dev mode
  • [v6] <Prism /> component throws an error on pnpm astro dev when used with the Cloudflare Workers integration #15722 — <Prism /> throws on astro dev with Cloudflare Workers integration
  • [v6]: Error when running vitest with Cloudflare: "Avoid setting resolve.external in your Cloudflare Worker #15878 — vitest + Cloudflare: "Avoid setting resolve.external" error

What's the expected result?

I was expecting the system to simply come up but instead it reports a rather cryptic stack trace. Claude Code helped me pinpoint where it was coming from.

Link to Minimal Reproducible Example

https://github.com/gregturn/mountainsummitpress.com

Participation

• I am willing to submit a pull request for this issue.