Bug: Uncaught ReferenceError: MessageChannel is not defined

[Rados51]

React version: 19.0.0

Steps To Reproduce

1. Create an Astro & React project with server adapter for Cloudflare
2. Try to deploy to Cloudflare Pages via wrangler deploy

The current behavior

Uncaught ReferenceError: MessageChannel is not defined

The expected behavior

Should work in the same way as latest 18 version.

https://github.com/facebook/react/blob/6a4b46cd70d2672bc4be59dcb5b8dede22ed0cef/packages/react-server/src/ReactServerStreamConfigBrowser.js#L16C1-L28C2

[phase]

I made a repo with the steps to reproduce this: https://github.com/phase/test-astro-react19-cf-workers

[prolanzer]

Had to downgrade to 18.x.x to make the deploy working again.

[ucefmath]

applyPolyfill from message-port-polyfill

[terao-ryohei]

I made a repo with the steps to reproduce this: https://github.com/phase/test-astro-react19-cf-workers

I have same problem in my ReactRouterV7 project.
I tried fix this, and build/deploy, Then I got work in my environment.
Please check it.

122|            'astro:build:setup': ({ vite, target }) => {
123|                if (target === 'server') {
124|                    vite.resolve ||= {};
125|                   vite.resolve.alias ||= {};
126|                    const aliases = [
127|                        {
128|                            find: 'react-dom/server',
129|                           -  replacement: 'react-dom/server.browser',
129|                           +  replacement: 'react-dom/server.edge',
130|                        },
131|                    ];

In ReactRouterv7, I can fix same. (fix entry.server.tsx)
That's why I think we can't use react-dom/server.browser on React_v19 or something.