`WritableStream` errors when running with React 19.2.0

[l0gicgate]

Describe the Bug

The render() method breaks with the following error:

TypeError:
The "transform.writable" property must be an instance of WritableStream. Received an instance of Writable
code: 'ERR_INVALID_ARG_TYPE'

Which package is affected (leave empty if unsure)

@react-email/render

Link to the code that reproduces this issue

https://github.com/resend/react-email

To Reproduce

1. Install React 19.2.0
2. Try to use render()

Expected Behavior

Not to break.

What's your node version? (if relevant)

No response

[joshverd]

Getting a different, but probably related, error with Bun:
"TypeError: undefined is not an object (evaluating 'Object.hasOwn(reactDOMServer, "renderToReadableStream")')"

EDIT: Reverting to react@19.1.0 and react-dom@19.1.0 fixed the issue

[eddie-englund]

I'm seeing the same error with a freshly installed project using node 22.20.0

[gabrielmfern]

Can you try this with @react-email/render@1.3.2-canary.0? I was able to reproduce and @react-email/render@1.3.2-canary.0 fixed it on my side.

[l0gicgate]

@gabrielmfern it does not work with that canary for me.

[gabrielmfern]

@l0gicgate That is not the error I get when I go from your reproduction steps, please provide a minimal reproduction so that we can fix.

[l0gicgate]

@gabrielmfern it looks like this may be related to @happy-dom/jest-environment

But here's the most minimal repro I could put together which is close to the setup in my repo

https://github.com/l0gicgate/react-email-issue-2521

It appears that if you comment this out in the Jest config, tests will pass with JS dom.

testEnvironment: '@happy-dom/jest-environment',

I've opened an issue on the Happy Dom repo:
capricorn86/happy-dom#1919

[l0gicgate]

I'm closing this as it's unrelated to this repo.

[proevilz]

I've just ran into this issue @l0gicgate

Steps to reproduce:

1. bunx create-email@latest
2. cd react-email-start
3. bun install && bun run dev
4. Navigate to http://localhost:3000

{
  "name": "react-email-starter",
  "version": "1.1.0",
  "private": true,
  "scripts": {
    "build": "email build",
    "dev": "email dev",
    "export": "email export"
  },
  "dependencies": {
    "@react-email/components": "0.5.5",
    "react-dom": "^19.0.0",
    "react": "^19.0.0"
  },
  "devDependencies": {
    "@react-email/preview-server": "4.2.12",
    "@types/react": "^19.0.1",
    "@types/react-dom": "^19.0.1",
    "react-email": "4.2.12"
  }
}

[gabrielmfern]

Let's leave this open up until we actually get it fixed