Failed to import - react@rc in development mode

[nicksrandall]

Failing module

esm.sh is not properly converting the react development package (written as CJS) to ESM. It only provides the default export and nothing else. I can change my code to switch to import * as React from 'react' but the issue is that many of my dependencies that use react to not do that so it still breaks.

• GitHub: https://github.com/facebook/react
• npm: https://npmjs.com/package/react

  import { useEffect } from "https://esm.sh/react@rc?dev"

Error message

After onload I got this:

Package does not export module `useEffect`. 

Additional info

• esm.sh version: 135
• Browser version: Latest Chrome

[ije]

thanks for reporting! import { useEffect } from "https://esm.sh/react@rc" should work good, react 19 changed the development build. i will fix asap!

[ije]

[nicksrandall]

@ije I'm not seeing this as fixed for the dev build (which is what this issue was specifically about). Has this change be deployed to esm.sh?

[ije]

Has this change be deployed to esm.sh?

nope, i will depoy soon