WordPress import crashes with 'module is not defined' — sax CJS incompatible with workerd"

[khoinguyenpham04]

This Roadmap discussion mirrors #573: WordPress import crashes with 'module is not defined' — sax CJS incompatible with workerd".

Use this discussion to upvote the roadmap item and discuss priority, use cases, and product feedback. Keep implementation tracking, reproduction details, and PR-specific feedback on the source issue.

• Source issue: #573
• Status: Open
• Labels: bug, area/core, roadmap/1.0, roadmap/migration-onboarding
• Original author: rafalofs

Original Issue

Description

WordPress import in the admin UI crashes with "module is not defined" when using the Cloudflare adapter in dev mode. Navigating to /_emdash/admin/import/wordpress or attempting a file-based WXR import both trigger the same error.

Steps to reproduce

Create a new project with the Cloudflare adapter: npm create emdash@latest (select marketing-cloudflare template)
Run npx emdash dev
Navigate to http://localhost:4321/_emdash/admin/import/wordpress
Page crashes with "module is not defined"
Alternatively, try uploading a WordPress WXR export file — same error

Environment

emdash: 0.5.0
@​emdash-cms/cloudflare: 0.5.0
astro: 6.1.6
@​astrojs/cloudflare: 13.1.9
wrangler: 4.83.0
react: 19.2.4
Node.js: (run node -v and paste)
OS: macOS

Logs / error output

module is not defined
Stack Trace
  at runInRunnerObject (workers/runner-worker/index.js:106:3)
  at _NonRunnablePipeline.getComponentByRoute (.../node_modules/.vite/deps_ssr/astro_app_entrypoint_dev.js:195:20)
  at matchRoute (.../node_modules/.vite/deps_ssr/astro_app_entrypoint_dev.js:265:14)
  at DevApp.devMatch (.../node_modules/.vite/deps_ssr/astro_app_entrypoint_dev.js:376:26)
  at Object.handle [as fetch] (.../node_modules/.vite/deps_ssr/@​astrojs_cloudflare_entrypoints_server.js:165:20)
  at maybeCaptureError (workers/runner-worker/index.js:50:10)