Error: A Node.js API is used (MessageChannel) which is not supported in the Edge Runtime.

[tszhong0411]

Describe the Bug

Using React 19 + Next.js 15

I want to use @react-email/render on edge runtime. However, I got this error:

unhandledRejection: Error: A Node.js API is used (MessageChannel) which is not supported in the Edge Runtime.

Which package is affected (leave empty if unsure)

@react-email/render

Link to the code that reproduces this issue

https://codesandbox.io/p/devbox/react-email-render-on-edge-runtime-5dlkxp

To Reproduce

1. Go to /api/email
2. See the error

Expected Behavior

No errors. And render the component successfully in email.

What's your node version? (if relevant)

No response